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  • Error "exit signal Bus error (7)" How to continue after making a backtrace?

    - by Mikel
    I have a Centos Server in 1and1 with Apache, Magento, MagentoBooster and Xcache installed. The server usually (1-8 times per day) prints this error "exit signal Bus error (7)" and sometimes this causes Apache not to respond. I have made a backtrace with GDB, but I don't know how to continue. gdb /usr/sbin/httpd core.XXXX --batch --quiet -ex "thread apply all bt full" backtrace.log The backtrace: [New Thread 15312] [Thread debugging using libthread_db enabled] Core was generated by `/usr/sbin/httpd'. Program terminated with signal 7, Bus error. #0 0x00002abcf6c7324e in memcpy () from /lib64/libc.so.6 Thread 1 (Thread 0x2abcf8c72300 (LWP 15312)): #0 0x00002abcf6c7324e in memcpy () from /lib64/libc.so.6 No symbol table info available. #1 0x00002abd02e6b9c7 in ?? () from /usr/lib64/php/modules//php_ioncube_loader_lin_5.2_x86_64.so No symbol table info available. #2 0x00002abd02ed4d47 in _zval_dup () from /usr/lib64/php/modules//php_ioncube_loader_lin_5.2_x86_64.so No symbol table info available. #3 0x00002abd02ecdffb in ?? () from /usr/lib64/php/modules//php_ioncube_loader_lin_5.2_x86_64.so No symbol table info available. #4 0x00002abd02c32636 in xc_compile_file (h=0x7fffc3e7e4f0, type=2) at /opt/xcache-1.3.2-rc1/xcache.c:1060 __orig_bailout = 0x7fffc3e88f10 __bailout = {{__jmpbuf = {46991244125792, 3379122525071325456, 46991369192208, 140736480142576, 140736480142656, 46991244125792, 3379207471940512272, 3379122524988693332}, __mask_was_saved = 0, __saved_mask = {__val = {46991369228841, 46991369206800, 46991369195208, 46991382361728, 46991369196536, 46991369206984, 46991369210744, 0, 46991240130544, 140733193388033, 0, 140736480142296, 46991240361284, 46991369207528, 46991369232128, 3}}}} sandbox = {alloc = 0, filename = 0x2abd078dd0e0 "/var/www/vhosts/DOMAIN/httpdocs/var/ait_rewrite/67b58abff9e6bd7b400bb2fc1903bf2f.php", orig_included_files = {nTableSize = 256, nTableMask = 255, nNumOfElements = 191, nNextFreeElement = 0, pInternalPointer = 0x2abcf4da53d0, pListHead = 0x2abcf4da53d0, pListTail = 0x2abd07dfeb28, arBuckets = 0x2abd0896d690, pDestructor = 0, persistent = 0 '\000', nApplyCount = 0 '\000', bApplyProtection = 1 '\001'}, tmp_included_files = 0x2abd0069e830, orig_zend_constants = 0x2abd0d630b60, tmp_zend_constants = {nTableSize = 2048, nTableMask = 2047, nNumOfElements = 1559, nNextFreeElement = 0, pInternalPointer = 0x2abd08283760, pListHead = 0x2abd08283760, pListTail = 0x2abd08320810, arBuckets = 0x2abd08302aa0, pDestructor = 0x2abd02c34850 <xc_free_zend_constant>, persistent = 1 '\001', nApplyCount = 0 '\000', bApplyProtection = 1 '\001'}, orig_function_table = 0x2abd0d61f340, orig_class_table = 0x2abd0d61f2b0, orig_auto_globals = 0x2abd0d618910, tmp_function_table = {nTableSize = 2048, nTableMask = 2047, nNumOfElements = 1555, nNextFreeElement = 0, pInternalPointer = 0x2abd08320ce0, pListHead = 0x2abd08320ce0, pListTail = 0x2abd0933fe60, arBuckets = 0x2abd079c8500, pDestructor = 0x2abd0033e1d0 <zend_function_dtor>, persistent = 1 '\001', nApplyCount = 0 '\000', bApplyProtection = 0 '\000'}, tmp_class_table = { nTableSize = 16, nTableMask = 15, nNumOfElements = 0, nNextFreeElement = 0, pInternalPointer = 0x0, pListHead = 0x0, pListTail = 0x0, arBuckets = 0x2abd079dbf60, pDestructor = 0x2abd0033dcf0 <destroy_zend_class>, persistent = 1 '\001', nApplyCount = 0 '\000', bApplyProtection = 0 '\000'}, tmp_auto_globals = {nTableSize = 16, nTableMask = 15, nNumOfElements = 9, nNextFreeElement = 0, pInternalPointer = 0x2abd0933ffc0, pListHead = 0x2abd0933ffc0, pListTail = 0x2abd093403e0, arBuckets = 0x2abd09340470, pDestructor = 0, persistent = 1 '\001', nApplyCount = 0 '\000', bApplyProtection = 0 '\000'}, tmp_internal_constant_tail = 0x2abd08320810, tmp_internal_function_tail = 0x2abd0933fe60, tmp_internal_class_tail = 0x0, orig_user_error_handler_error_reporting = 8191} op_array = <value optimized out> xce = {type = XC_TYPE_PHP, hvalue = 2460, next = 0x2abd0d939e60, cache = 0x2abd0d90b038, size = 10, refcount = 46991369191320, hits = 4, ctime = 46991362335072, atime = 8, dtime = 46991240673248, ttl = 46991369192096, name = {lval = 46991363920096, dval = 2.3216818564143281e-310, str = { val = 0x2abd078dd0e0 "/var/www/vhosts/DOMAIN/httpdocs/var/ait_rewrite/67b58abff9e6bd7b400bb2fc1903bf2f.php", len = 107}, ht = 0x2abd078dd0e0, obj = {handle = 126734560, handlers = 0x2abd0000006b}}, data = {php = 0x7fffc3e7e440, var = 0x7fffc3e7e440}, have_references = 0 '\000'} stored_xce = 0x0 php = {sourcesize = 8947, device = 64769, inode = 9907963, mtime = 1353055102, op_array = 0x2abd00344004, constinfo_cnt = 1, constinfos = 0x0, funcinfo_cnt = 132120232, funcinfos = 0x8, classinfo_cnt = 8, classinfos = 0x0, have_early_binding = 168 '\250', autoglobal_cnt = 10941, autoglobals = 0x8} cache = 0x2abd0d90b038 catched = <value optimized out> filename = <value optimized out> opened_path_buffer = "\000\000\000\000\000\000\000\000I\032\065\000\275*\000\000\300\347i\000\275*\000\000\001\000\000\000\000\000\000\000\377\377\377\377\000\000\000\000\000\000\000\000\003\000\000\000[\337\227\337,\002pr\n\000\000\000\000\000\000\000P\323\347\303\377\177\000\000\357\367\220\b\275*\000\000\243\002M\a\275*\000\000\005", '\000' <repeats 15 times>"\357, \367\220\b\275*\000\000\244\002M\a\275*\000\000Du0\000\275*\000\000\b\000\000\000\000\000\000\000\232b=\365\000\000\000\000\002\000\000\000\377\177\000\000\005\000\000\000\275*\000\000\220\322\347\303\377\177\000\000\000\020\000\000\000\000\000\000,\324\347\303\377\177\000\000`\321\347\303^", '\000' <repeats 27 times>, "\f\000\000 \001", '\000' <repeats 11 times>"\260, \322\347\303", '\000' <repeats 12 times>, "P\323\347\303\377\177\000\000x\225\332\364\004\000\000\000\001\000\000\000\031\000\000\000\300\331\336\a\275*\000\000\300\331\336\a\275*\000\000"... old_constinfo_cnt = 1559 old_funcinfo_cnt = 1555 old_classinfo_cnt = 0 #5 0x00002abd003290bf in compile_filename () from /etc/httpd/modules/libphp5.so No symbol table info available. #6 0x00002abd00398ded in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #7 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #8 0x00002abd0033b796 in zend_call_function () from /etc/httpd/modules/libphp5.so No symbol table info available. #9 0x00002abd0035b1e1 in zend_call_method () from /etc/httpd/modules/libphp5.so No symbol table info available. #10 0x00002abd00273bf4 in zif_spl_autoload_call () from /etc/httpd/modules/libphp5.so No symbol table info available. #11 0x00002abd0033b945 in zend_call_function () from /etc/httpd/modules/libphp5.so No symbol table info available. #12 0x00002abd0033c51e in zend_lookup_class_ex () from /etc/httpd/modules/libphp5.so No symbol table info available. #13 0x00002abd0033c728 in zend_fetch_class () from /etc/httpd/modules/libphp5.so No symbol table info available. #14 0x00002abd003a61ab in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #15 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #16 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #17 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #18 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #19 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #20 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #21 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #22 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #23 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #24 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #25 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #26 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #27 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #28 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #29 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #30 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #31 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #32 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #33 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #34 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #35 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #36 0x00002abd00366b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #37 0x00002abd0036628c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #38 0x00002abd00346943 in zend_execute_scripts () from /etc/httpd/modules/libphp5.so No symbol table info available. #39 0x00002abd00306898 in php_execute_script () from /etc/httpd/modules/libphp5.so No symbol table info available. #40 0x00002abd003cb09d in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #41 0x00002abcf4cfca0a in ap_run_handler () No symbol table info available. #42 0x00002abcf4cffe98 in ap_invoke_handler () No symbol table info available. #43 0x00002abcf4d0a74a in ap_internal_redirect () No symbol table info available. #44 0x00002abcfdb45bf0 in ap_make_dirstr_parent () from /etc/httpd/modules/mod_rewrite.so No symbol table info available. #45 0x00002abcf4cfca0a in ap_run_handler () No symbol table info available. #46 0x00002abcf4cffe98 in ap_invoke_handler () No symbol table info available. #47 0x00002abcf4d0a8f8 in ap_process_request () No symbol table info available. #48 0x00002abcf4d07b30 in ?? () No symbol table info available. #49 0x00002abcf4d03c92 in ap_run_process_connection () No symbol table info available. #50 0x00002abcf4d0e7a9 in ?? () No symbol table info available. #51 0x00002abcf4d0ea3a in ?? () No symbol table info available. #52 0x00002abcf4d0f29d in ap_mpm_run () No symbol table info available. #53 0x00002abcf4ce9e48 in main () No symbol table info available. Can anyone help me? ADITIONAL INFO php -v PHP 5.2.10 (cli) (built: Nov 13 2009 11:44:05) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies with XCache v1.3.2-rc1, Copyright (c) 2005-2011, by mOo with the ionCube PHP Loader v3.1.28, Copyright (c) 2002-2007, by ionCube Ltd. httpd -v Server version: Apache/2.2.3 Server built: May 4 2011 06:51:15 Apache modules: core prefork http_core mod_so mod_auth_basic mod_auth_digest mod_authn_file mod_authn_alias mod_authn_anon mod_authn_dbm mod_authn_default mod_authz_host mod_authz_user mod_authz_owner mod_authz_groupfile mod_authz_dbm mod_authz_default util_ldap mod_authnz_ldap mod_include mod_log_config mod_logio mod_env mod_ext_filter mod_mime_magic mod_expires mod_deflate mod_headers mod_usertrack mod_setenvif mod_mime mod_dav mod_status mod_autoindex mod_info mod_dav_fs mod_vhost_alias mod_negotiation mod_dir mod_actions mod_speling mod_userdir mod_alias mod_rewrite mod_proxy mod_proxy_balancer mod_proxy_ftp mod_proxy_http mod_proxy_connect mod_cache mod_suexec mod_disk_cache mod_file_cache mod_mem_cache mod_cgi mod_version mod_fcgid mod_perl mod_php5 mod_proxy_ajp mod_python mod_ssl Aditional modules: dbase ionCube Loader sysvsem sysvshm EDIT (November 18) I have disabled some suspicious modules and the error persist. The new backtrace: [New Thread 12403] [Thread debugging using libthread_db enabled] Core was generated by `/usr/sbin/httpd'. Program terminated with signal 7, Bus error. #0 0x00002b0c5754a24e in memcpy () from /lib64/libc.so.6 Thread 1 (Thread 0x2b0c59549300 (LWP 12403)): #0 0x00002b0c5754a24e in memcpy () from /lib64/libc.so.6 No symbol table info available. #1 0x00002b0c558519c7 in ?? () from /usr/lib64/php/modules//php_ioncube_loader_lin_5.2_x86_64.so No symbol table info available. #2 0x00002b0c558bad47 in _zval_dup () from /usr/lib64/php/modules//php_ioncube_loader_lin_5.2_x86_64.so No symbol table info available. #3 0x00002b0c558b3ffb in ?? () from /usr/lib64/php/modules//php_ioncube_loader_lin_5.2_x86_64.so No symbol table info available. #4 0x00002b0c60d650bf in compile_filename () from /etc/httpd/modules/libphp5.so No symbol table info available. #5 0x00002b0c60dd4ded in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #6 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #7 0x00002b0c60d77796 in zend_call_function () from /etc/httpd/modules/libphp5.so No symbol table info available. #8 0x00002b0c60d971e1 in zend_call_method () from /etc/httpd/modules/libphp5.so No symbol table info available. #9 0x00002b0c60cafbf4 in zif_spl_autoload_call () from /etc/httpd/modules/libphp5.so No symbol table info available. #10 0x00002b0c60d77945 in zend_call_function () from /etc/httpd/modules/libphp5.so No symbol table info available. #11 0x00002b0c60d7851e in zend_lookup_class_ex () from /etc/httpd/modules/libphp5.so No symbol table info available. #12 0x00002b0c60d78728 in zend_fetch_class () from /etc/httpd/modules/libphp5.so No symbol table info available. #13 0x00002b0c60de21ab in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #14 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #15 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #16 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #17 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #18 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #19 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #20 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #21 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #22 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #23 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #24 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #25 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #26 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #27 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #28 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #29 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #30 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #31 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #32 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #33 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #34 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #35 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #36 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #37 0x00002b0c60da2b91 in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #38 0x00002b0c60da228c in execute () from /etc/httpd/modules/libphp5.so No symbol table info available. #39 0x00002b0c60d82943 in zend_execute_scripts () from /etc/httpd/modules/libphp5.so No symbol table info available. #40 0x00002b0c60d42898 in php_execute_script () from /etc/httpd/modules/libphp5.so No symbol table info available. #41 0x00002b0c60e0709d in ?? () from /etc/httpd/modules/libphp5.so No symbol table info available. #42 0x00002b0c555d3a0a in ap_run_handler () No symbol table info available. #43 0x00002b0c555d6e98 in ap_invoke_handler () No symbol table info available. #44 0x00002b0c555e174a in ap_internal_redirect () No symbol table info available. #45 0x00002b0c5e41cbf0 in ap_make_dirstr_parent () from /etc/httpd/modules/mod_rewrite.so No symbol table info available. #46 0x00002b0c555d3a0a in ap_run_handler () No symbol table info available. #47 0x00002b0c555d6e98 in ap_invoke_handler () No symbol table info available. #48 0x00002b0c555e18f8 in ap_process_request () No symbol table info available. #49 0x00002b0c555deb30 in ?? () No symbol table info available. #50 0x00002b0c555dac92 in ap_run_process_connection () No symbol table info available. #51 0x00002b0c555e57a9 in ?? () No symbol table info available. #52 0x00002b0c555e5a3a in ?? () No symbol table info available. #53 0x00002b0c555e629d in ap_mpm_run () No symbol table info available. #54 0x00002b0c555c0e48 in main () No symbol table info available.

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  • Design patterns for Agent / Actor based concurrent design.

    - by nso1
    Recently i have been getting into alternative languages that support an actor/agent/shared nothing architecture - ie. scala, clojure etc (clojure also supports shared state). So far most of the documentation that I have read focus around the intro level. What I am looking for is more advanced documentation along the gang of four but instead shared nothing based. Why ? It helps to grok the change in design thinking. Simple examples are easy, but in a real world java application (single threaded) you can have object graphs with 1000's of members with complex relationships. But with agent based concurrency development it introduces a whole new set of ideas to comprehend when designing large systems. ie. Agent granularity - how much state should one agent manage - implications on performance etc or are their good patterns for mapping shared state object graphs to agent based system. tips on mapping domain models to design. Discussions not on the technology but more on how to BEST use the technology in design (real world "complex" examples would be great).

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  • N-Tiered application design tool

    - by Ben V
    I'm beginning the design of a medium-sized web application. I usually like to design from the top down, i.e., start at the highest level and design my way down. I am planning to have the following layers: Presentation (PHP/Ajax) Business Logic Data Access Database Now I'd like to start sketching out the major objects in each layer and the interaction between layers. Is there a tool more specific to this purpose than just using a graphics/diagramming tool like Visio?

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  • Fiscal year, quarters, student table, and faculty table... How do I relate these?!

    - by yuudachi
    I have a student and faculty table. The primary key for student is studendID (SID) and faculty's primary key is facultyID, naturally. Student has an advisor column and a requested advisor column, which are foreign key to faculty. That's simple enough, right? However, now I have to throw in dates. I want to be able to view who their advisor was for a certain quarter (such as 2009 Winter) and who they had requested. The result will be a table like this: Year | Term | SID | Current | Requested ------------------------------------------------ 2009 | Winter | 860123456 | 1 | NULL 2009 | Winter | 860445566 | 3 | NULL 2009 | Winter | 860369147 | 5 | 1 And then if I feel like it, I could also go ahead and view a different year and a different term. I am not sure how these new table(s) will look like. Will there be a year table with three columns that are Fall, Spring and Winter? And what will the Fall, Spring, Winter table have? I am new to the art of tables, so this is baffling me... Also, I feel I should clarify how the site works so far now. Admin can approve student requests, and what happens is that the student's current advisor gets overwritten with their request. However, I think I should not do that anymore, right?

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  • RetinaJS and LESS : Background image doesn't show on iOS

    - by jidma
    I am trying to make a background image into a retina image using LESS CSS and RetinaJs: in my index.html file : <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> [...] <link type="text/css" rel="stylesheet/less" href="resources/css/retina.less"> <script type="text/javascript" src="resources/js/less-1.3.0.minjs" ></script> [...] </head> <body> [...] <script type="text/javascript" src="resources/js/retina.js"></script> </body> </html> in my retina.less file: .at2x(@path, @w: auto, @h: auto) { background-image: url("@{path}"); @at2x_path: ~`"@{path}".split('.').slice(0, "@{path}".split('.').length - 1).join(".") + "@2x" + "." + "@{path}".split('.')["@{path}".split('.').length - 1]`; @media all and (-webkit-min-device-pixel-ratio : 1.5) { background-image: url("@{at2x_path}"); background-size: @w @h; } } .topMenu { .at2x('../../resources/img/topMenuTitle.png'); } I have both topMenuTitle.png (320px x 40px) and [email protected] (640px x 80px) in the same folder. When test this code: In Firefox i have the normal Background In the XCode iPhone simulator I also have the normal Background In the iPhone device, I don't have any background at all. I'm using GWT if that matters. Any suggestions ? Thanks.

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  • Good design of mapping Java Domain objects to Tables (using Hibernate)

    - by M. McKenzie
    Hey guys, I have a question that is more in the realm of design, than implementation. I'm also happy for anyone to point out resources for the answer and I'll gladly, research for myself. Highly simplified Java and SQL: Say I have a business domain POJO called 'Picture' with three attributes. class Picture int idPicture String fileName long size Say I have another business domain POJO called "Item" with 3 attributes Class Item int idItem String itemName ArrayList itemPictures These would be a normal simple relationship. You could say that 'Picture' object, will never exist outside an 'Item' object. Assume a picture belongs only to a specific item, but that an item can have multiple pictures Now - using good database design (3rd Normal Form), we know that we should put items and pictures in their own tables. Here is what I assume would be correct. table Item int idItem (primary key) String itemName table Picture int idPicture (primary key) varchar(45) fileName long size int idItem (foreign key) Here is my question: If you are making Hibernate mapping files for these objects. In the data design, your Picture table needs a column to refer to the Item, so that a foreign key relation can be maintained. However,in your business domain objects - your Picture does not hold a reference/attribute to the idItem - and does not need to know it. A java Picture instance is always instantiated inside an Item instance. If you want to know the Item that the Picture belongs to you are already in the correct scope. Call myItem.getIdItem() and myItem.getItemPictures(),and you have the two pieces of information you need. I know that Hibernate tools have a generator that can auto make your POJO's from looking at your database. My problem stems from the fact that I planned out the data design for this experiment/project first. Then when I went to make the domain java objects, I realized that good design dictated that the objects hold other objects in a nested way. This is obviously different from the way that a database schema is - where all objects(tables) are flat and hold no other complex types within them. What is a good way to reconcile this? Would you: (A) Make the hibernate mapping files so that Picture.hbm.xml has a mapping to the POJO parent's idItem Field (if it's even possible) (B) Add an int attribute in the Picture class to refer to the idItem and set it at instantiation, thus simplifying the hbm.xml mapping file by having all table fields as local attributes in the class (C) Fix the database design because it is wrong, dork. I'd truly appreciate any feedback

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  • Is it possible to embed a flash player in a table and retain the table properties

    - by user1494241
    I'd like to embed a music (flash) player in a table with clickable images but the embed code seems to throw the table properties off - it extends the width of the table. Is it possible to embed the player on the same row as the image whilst still retaining the table width? Here's what I've been using: <table width="620" border="0" cellspacing="0" cellpadding="0"> <tr> <td> <div align="left"><object height="18" width="100%"> <param name="movie" value="https://player.soundcloud.com/player.swf?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F1253725&amp;auto_play=false&amp;player_type=tiny&amp;font=Georgia&amp;color=9a6600&show_playcount=false&default_width=375&default_height=40&show_user=false"></param> <param name="allowscriptaccess" value="always"></param> <param name="wmode" value="transparent"></param><embed wmode="transparent" allowscriptaccess="always" height="18" src="https://player.soundcloud.com/player.swf?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F1253725&amp;auto_play=false&amp;player_type=tiny&amp;font=Georgia&amp;color=9a6600&show_playcount=false&default_width=375&default_height=40&show_user=false" type="application/x-shockwave-flash" width="100%"></embed> </object> </td> <td> <div align="right"><img src="http://dl.dropbox.com/u/31856944/Virb/splash_freedownload-2.png" border="0" width="245" height="42" usemap="#Map" /></div> </td> <tr> <td> <div align="right"><img src="http://dl.dropbox.com/u/31856944/Virb/splash_share-2.png" border="0" width="620" height="31" usemap="#Map2" /></div> </td> </tr> </table>

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  • General Overview of Design Pattern Types

    Typically most software engineering design patterns fall into one of three categories in regards to types. Three types of software design patterns include: Creational Type Patterns Structural Type Patterns Behavioral Type Patterns The Creational Pattern type is geared toward defining the preferred methods for creating new instances of objects. An example of this type is the Singleton Pattern. The Singleton Pattern can be used if an application only needs one instance of a class. In addition, this singular instance also needs to be accessible across an application. The benefit of the Singleton Pattern is that you control both instantiation and access using this pattern. The Structural Pattern type is a way to describe the hierarchy of objects and classes so that they can be consolidated into a larger structure. An example of this type is the Façade Pattern.  The Façade Pattern is used to define a base interface so that all other interfaces inherit from the parent interface. This can be used to simplify a number of similar object interactions into one single standard interface. The Behavioral Pattern Type deals with communication between objects. An example of this type is the State Design Pattern. The State Design Pattern enables objects to alter functionality and processing based on the internal state of the object at a given time.

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  • CIC 2010 - Ghost Stories and Model Based Design

    - by warren.baird
    I was lucky enough to attend the collaboration and interoperability congress recently. The location was very beautiful and interesting, it was held in the mountains about two hours outside Denver, at the Stanley hotel, famous both for inspiring Steven King's novel "The Shining" and for attracting a lot of attention from the "Ghost Hunters" TV show. My visit was prosaic - I didn't get to experience the ghosts the locals promised - but interesting, with some very informative sessions. I noticed one main theme - a lot of people were talking about Model Based Design (MBD), which is moving design and manufacturing away from 2d drawings and towards 3d models. 2d has some pretty deep roots in industrial manufacturing and there have been a lot of challenges encountered in making the leap to 3d. One of the challenges discussed in several sessions was how to get model information out to the non-engineers in the company, which is a topic near and dear to my heart. In the 2D space, people without access to CAD software (for example, people assembling a product on the shop floor) can be given printouts of the design - it's not particularly efficient, and it definitely isn't very green, but it tends to work. There's no direct equivalent in the 3D space. One of the ways that AutoVue is used in industrial manufacturing is to provide non-CAD users with an easy to use, interactive 3D view of their products - in some cases it's directly used by people on the shop floor, but in cases where paper is really ingrained in the process, AutoVue can be used by a technical publications person to create illustrative 2D views that can be printed that show all of the details necessary to complete the work. Are you making the move to model based design? Is AutoVue helping you with your challenges? Let us know in the comments below.

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  • Design for XML mapping scenarios between two different systems [on hold]

    - by deepak_prn
    Mapping XML fields between two systems is a mundane routine in integration scenarios. I am trying to make the design documents look better and provide clear understanding to the developers especially when we do not use XSLT or any other IDE such as jDeveloper or eclipse plugins. I want it to be a high level design but at the same time talk in developer's language. So that there is no requirements that slip under the crack. For example, one of the scenarios goes: the store cashier sells an item, the transaction data is sent to Data management system. Now, I am writing a functional design for the scenario which deals with mapping XML fields between our system and the data management system. Question : I was wondering if some one had to deal with mapping XML fields between two systems? (without XSLT being involved) and if you used a table to represent the fields mapping (example is below) or any other visualization tool which does not break the bank ? I am trying to find out if there is a better way to represent XML mapping in your design documents. The widely accepted and used method seems to be using a simple table such as in the picture to illustrate the mapping. I am wondering if there are alternate ways/ tools to represent such as in Altova:

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  • How to design good & continuous tiles

    - by Mikalichov
    I have trouble designing tiles so that when assembled, they don't look like tiles, but look like an homogeneous thing. For example on the image below: even though the main part of the grass is only one tile, you don't "see" the grid; you know where it is if you look a bit carefully, but it is not obvious. Whereas when I design tiles, you can only see "oh, jeez, 64 times the same tile". A bit like on that image: (taken from a gamedev.stackexchange question, sorry; no critic about the game, but it proves my point, and actually has better tile design that what I manage) I think the main problem is that I design them so they are independent, there is no junction between two tiles if put closed to each other. I think having the tiles more "continuous" would have a smoother effect, but can't manage to do it, it seems overly complex to me. I think it is probably simpler than I think once you know how to do it, but couldn't find a tutorial on that specific point. Is there a known method to design continuous / homogeneous tiles? (my terminology might be totally wrong, don't hesitate to correct me)

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  • Learning good OOP design & unlearning some bad habits

    - by Nick
    I have been mostly a C programmer so far in my career with knowledge of C++. I rely on C++ mostly for the convenience STL provides and I hardly ever focus on good design practices. As I have started to look for a new job position, this bad habit of mine has come back to haunt me. During the interviews, I have been asked to design a problem (like chess, or some other scenario) using OOP and I doing really badly at that (I came to know this through feedback from one interview). I tried to google stuff and came up with so many opinions and related books that I don't know where to begin. I need a good through introduction to OOP design with which I can learn practical design, not just theory. Can you point me to any book which meets my requirements ? I prefer C++, but any other language is fine as long as I can pick-up good practices. Also, I know that books can only go so far. I would also appreciate any good practice project ideas that helped you learn and improve your OOP concepts. Thanks.

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  • How can I design good continuous (seamless) tiles?

    - by Mikalichov
    I have trouble designing tiles so that when assembled, they don't look like tiles, but look like a homogeneous thing. For example, see the image below: Even though the main part of the grass is only one tile, you don't "see" the grid; you know where it is if you look a bit carefully, but it is not obvious. Whereas when I design tiles, you can only see "oh, jeez, 64 times the same tile," like in this image: (I took this from another GDSE question, sorry; not be critical of the game, but it proves my point. And actually has better tile design that what I manage, anyway.) I think the main problem is that I design them so they are independent, there is no junction between two tiles if put closed to each other. I think having the tiles more "continuous" would have a smoother effect, but can't manage to do it, it seems overly complex to me. I think it is probably simpler than I think once you know how to do it, but couldn't find a tutorial on that specific point. Is there a known method to design continuous / homogeneous tiles? (My terminology might be totally wrong, don't hesitate to correct me.)

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  • MSFT Excel pivot table links to external data

    - by dreftymac
    Question1: What is the best online forum to ask MSFT Excel questions of the following variety? Question2: How can I link an excel pivot-table to a potentially changing source table without having to re-draw the excel pivot-table layout every time the source table changes data. (Note, the columns are not changing, just the data in the rows). Background: I have an excel 2007 pivot table that is grabbing data from another sheet (an excel "table" ... tables are a new feature of excel 2007). When I change the data in the source table, and then go to the pivot table and press "refresh" ... the pivot table reverts to its "blank" format and requires me to re-drag the columns rows and values. What I want is for the pivot-table to simply re-draw itself without me having to re-create the pivot table layout.

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  • What advantages do we have when creating a separate mapping table for two relational tables

    - by Pankaj Upadhyay
    In various open source CMS, I have noticed that there is a separate table for mapping two relational tables. Like for categories and products, there is a separate product_category_mapping table. This table just has a primary key and two foreign keys from the categories and product tables. My question is what are the benefits of this database design rather than just linking the tables directly by defining a foreign key in either table? Is it just matter of convenience?

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  • How to obtain a random sub-datatable from another data table

    - by developerit
    Introduction In this article, I’ll show how to get a random subset of data from a DataTable. This is useful when you already have queries that are filtered correctly but returns all the rows. Analysis I came across this situation when I wanted to display a random tag cloud. I already had the query to get the keywords ordered by number of clicks and I wanted to created a tag cloud. Tags that are the most popular should have more chance to get picked and should be displayed larger than less popular ones. Implementation In this code snippet, there is everything you need. ' Min size, in pixel for the tag Private Const MIN_FONT_SIZE As Integer = 9 ' Max size, in pixel for the tag Private Const MAX_FONT_SIZE As Integer = 14 ' Basic function that retreives Tags from a DataBase Public Shared Function GetTags() As MediasTagsDataTable ' Simple call to the TableAdapter, to get the Tags ordered by number of clicks Dim dt As MediasTagsDataTable = taMediasTags.GetDataValide ' If the query returned no result, return an empty DataTable If dt Is Nothing OrElse dt.Rows.Count < 1 Then Return New MediasTagsDataTable End If ' Set the font-size of the group of data ' We are dividing our results into sub set, according to their number of clicks ' Example: 10 results -> [0,2] will get font size 9, [3,5] will get font size 10, [6,8] wil get 11, ... ' This is the number of elements in one group Dim groupLenth As Integer = CType(Math.Floor(dt.Rows.Count / (MAX_FONT_SIZE - MIN_FONT_SIZE)), Integer) ' Counter of elements in the same group Dim counter As Integer = 0 ' Counter of groups Dim groupCounter As Integer = 0 ' Loop througt the list For Each row As MediasTagsRow In dt ' Set the font-size in a custom column row.c_FontSize = MIN_FONT_SIZE + groupCounter ' Increment the counter counter += 1 ' If the group counter is less than the counter If groupLenth <= counter Then ' Start a new group counter = 0 groupCounter += 1 End If Next ' Return the new DataTable with font-size Return dt End Function ' Function that generate the random sub set Public Shared Function GetRandomSampleTags(ByVal KeyCount As Integer) As MediasTagsDataTable ' Get the data Dim dt As MediasTagsDataTable = GetTags() ' Create a new DataTable that will contains the random set Dim rep As MediasTagsDataTable = New MediasTagsDataTable ' Count the number of row in the new DataTable Dim count As Integer = 0 ' Random number generator Dim rand As New Random() While count < KeyCount Randomize() ' Pick a random row Dim r As Integer = rand.Next(0, dt.Rows.Count - 1) Dim tmpRow As MediasTagsRow = dt(r) ' Import it into the new DataTable rep.ImportRow(tmpRow) ' Remove it from the old one, to be sure not to pick it again dt.Rows.RemoveAt(r) ' Increment the counter count += 1 End While ' Return the new sub set Return rep End Function Pro’s This method is good because it doesn’t require much work to get it work fast. It is a good concept when you are working with small tables, let says less than 100 records. Con’s If you have more than 100 records, out of memory exception may occur since we are coping and duplicating rows. I would consider using a stored procedure instead.

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  • Why does display:table-cell not center content without display:table?

    - by Samuel
    I'm looking for the most efficient (or elegant) way to vertically and horizontally center content of variable height. I've come up with this: http://cssdeck.com/t/2veysdkg/16, which uses css tables to vertically center the main content. My demands for writing this particular piece of code were: Must be able to center variable and fixed width content vertically and horizontally Centered content must be inside the normal document flow (so no overlapping) Sticky footer and normal header of 100% width As few hacks, ugly code or non-semantic html as possible I didn't care about support for IE6, IE7 (I'll use a different stylesheet for them) The weird thing is that the demands above are only met when the header and footer are set to table-row, and the body-tag to display:table. Which is weird because as I understand it the css will generate anonymous table elements when parent table elements are missing. So table-cell should work without all the surrounding elements, but yet I've not been able to make it work. If it were up to me I would prefer to not mess with the display mode for the body tag, and leave the header and footer on display:block. But I've not been able to make it work. Does anyone understand why this doesn't work?

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  • Level Design V.S. Modeler

    - by Ecurbed
    From what I understand being a level designer and a character/environment/object/etc Modeler are two different jobs, yet sometimes it feels like a Modeler can also do the job of the level designer. I know this also depends on the scale of the game. For small games maybe they are one and the same, but for bigger games they become two different jobs. I understand a background in some modeling could not hurt when it comes to level design, but the question I have is: Do jobs prefer people who can model for level designing? This way they can kill two birds with one stone and have someone to create the assets and design the level. What is your opinion of the training? Does level design contain skill sets that make them completely different from what a modeler can do, or is this an easy transition for a modeler to become a level designer? Can you be a bad level designer but a good modeler and vice versa?

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  • Green Website Design

    - by Christofian
    This is kindove a strange question, but... There was a site called Blackle ( http://www.blackle.com/) which "claimed" to save energy by using a black background (it doesn't: see here: http://skeptics.stackexchange.com/questions/4373/how-much-energy-does-displaying-a-webpage-with-a-black-background-actually-save). However, blackle and it's idea of "green website design" interested me, and I was wondering if there are any ways to design an energy saving website that actually save energy. If anyone knows of any, please post them here. If nobody has any, then I guess there isn't a way to save energy through website design...

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  • How to design network protocols

    - by dandroid
    As a programmer, you work on your software design skills. You learn about things such as modularity and reusability and how you can achieve them in code. There's plenty of literature on the subject and engineers talk about it all the time. What about if you want to design network protocols? How do you judge that protocol X is badly designed while Y is well designed? (eg. in programming you are often pointed out to a well-written piece of code in order to learn from it - what is the equivalent for network protocols?) For example, suppose I want to design a P2P protocol similar to BitTorrent or I want to make a better version of the Socks protocol. How would I go about doing a good job on this? Thanks!

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  • Advice about a website design [closed]

    - by Dimitri
    I am web developer newbie. It doesn't mean that I don't know html/css/javascript but I am not good for web design. I am making a website for friend about a barber shop but I am not totally happy of my work due to lack of design. I would like to have some advice about the website and how can I improve the design? The website is in french because i am french. Here is the website : http://afrostyle92.fr/.

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  • Custom Logo Design - or - Free Logo Design

    When you search the web, you will be able to find unlimited companies and websites offering free services. Even though they brag about providing quality products, but you can never be sure how useful... [Author: Sha Amen - Web Design and Development - May 07, 2010]

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  • Software Architecture - From design to sucessful implementation

    - by user20358
    As the subject goes; once a software architect puts down the high level design and approach to a software that is to be developed from scratch, how does the team ensure that it is implemented successfully? To my mind the following things will need to be done Proper understanding of requirements Setting down coding practices and guidelines Regular code reviews to ensure the guidelines are being adhered to Revisiting the requirements phase and making necessary changes to design based on client inputs if there are any changes to requirements Proper documentation of what is being done in code Proper documentation of requirements and changes to them Last but not the least, implementing the design via object oriented code where appropriate Did I miss anything? Would love to hear any mistakes that you have learned from in your project experiences. What went wrong, what could have been done better. Thanks for taking the time..

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  • Right multi object dependance design

    - by kenny
    I need some help with a correct design. I have a class called BufferManager. The push() method of this class reads data from a source and pushes it to a buffer repeatedly until there is no more data left in the source. There are also consumer threads that read data from this buffer, as soon as new data arrives. There is an option to sort the data before it comes to buffer. What I do right now is that BufferManager, instead of pushing data to the buffer, pushes it to another "sorting" buffer and starts a sorting thread. SorterManager class reads the data, sorts it in files and push()es the sorted data into the buffer. There will be a bottleneck (I use merge sort with files) but this is something I can't avoid. This is a bad design, because both BufferManager and SorterManager push data to a buffer (that consumers read from). I think only BufferManager should do it. How can I design it?

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