grails - Is Map attribute in DefaultLinkGenerator link() method thread safe? -



grails - Is Map attribute in DefaultLinkGenerator link() method thread safe? -

we built grails (2.3.7) application overriding link(map attr, string encoding = 'utf-8') in defaultlinkgenerator class. reason doing have same url throughout our application business requirement customer. in overriding link() method, modifying map new request parameters.

now in production seeing next exception occurs sporadically , haven't been able reproduce locally.

2014-09-29 01:04:06,257 stacktrace error total stack trace: java.lang.arrayindexoutofboundsexception: 3 @ org.codehaus.groovy.grails.web.mapping.urlcreatorcache$reversemappingkey.<init>(urlcreatorcache.java:196) @ org.codehaus.groovy.grails.web.mapping.urlcreatorcache.createkey(urlcreatorcache.java:62) @ org.codehaus.groovy.grails.web.mapping.defaulturlmappingsholder.getreversemappingnodefault(defaulturlmappingsholder.java:265) @ org.codehaus.groovy.grails.web.mapping.defaulturlmappingsholder.getreversemappingnodefault(defaulturlmappingsholder.java:257) @ org.codehaus.groovy.grails.web.mapping.defaultlinkgenerator.link(defaultlinkgenerator.groovy:213) @ gov.texas.multitenant.core.mapping.multitenantlinkgenerator.super$2$link(multitenantlinkgenerator.groovy)

the code in 'urlcreatorcache$reversemappingkey' throws above arrayindexoutofexception can happen when map attribute (params) gets mutated during loop. excerpt of code below.

paramkeys = new string[params.size()]; paramvalues = new string[params.size()]; int = 0; (map.entry entry : params.entryset()) { **paramkeys[i] = string.valueof(entry.getkey());** //throws exception here string value = null; if (entry.getvalue() instanceof charsequence) { value = string.valueof(entry.getvalue()); } ... paramvalues[i] = value; i++; }

now question is, map attribute thread safe? can mutated between threads since modifying it?

any feedback great appreciated. in advance.

you wouldn't know within method - implementing map interface allowable. that's not of import - you're causing problem (by beingness 1 of 2 concurrent editors of apparently non-threadsafe instance) , can prepare it.

instead of modifying map, create new 1 (any map implementation since code , code in method can access it) , modify that, , pass in link generation. throw away , utilize real map farther calculations. like

def attrs = ... // 'real' map def re-create = [:] + attrs copy.foo = 42 copy.bar = 'a high 1 indeed' string link = linkgenerator.link(copy) // ... def foo = attrs.foo // not available, set in copy, no longer using ...

grails

Comments

Post a Comment

Popular posts from this blog

Delphi change the assembly code of a running process -

Delphi change the assembly code of a running process - i'm trying alter address 00741fa5 has push test.009e721c . alter push test.009e71c8 . procedure callback; asm force $9e71c8 end; procedure tform2.btn1click(sender: tobject); var ppid :dword; pprocess : cardinal; begin getwindowthreadprocessid(findwindow(nil,pchar('test')), @ppid); pprocess := openprocess(process_all_access, false, ppid); injectasm(pprocess, $741fa5, 10, integer(@callback), 0); end; here injectasm function (with error checking) function injectasm(process: longword; injectaddress, injectsize, codeaddress, codesize : integer): pointer; var csize, rsize : integer; replaced : array of byte; jmp : array [0..4] of byte; jmpaddress : integer; nopv : byte; : integer; nbr: ulong_ptr; begin //injectsize must equal or greater 5, because need space our //(far) jmp wwxxyyzz instruction //if there's no space, inject in place of few instructions if injectsize ...
Read more

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) -

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) - hello have problem hibernate , jackson. have 2 pojos @entity @table(name = "users") public class user implements serializable { static final long serialversionuid = 4235637833262722256l; @id @generatedvalue private int id; @column(name = "creation_date") private date creationdate; @column(name = "first_name") private string firstname; @column(name = "last_name") private string lastname; @version @column(name = "version") private int version; @column(name = "e_mail") private string email; @column(name = "enabled") private boolean enabled; @column(name = "login") private string login; @column(name = "password") private string password; @jsonmanagedreference("role") @onetomany(mappedby = "user", cascade = cascadetype.all,fetch = fetchtyp...
Read more

C++ 11 "class" keyword -

C++ 11 "class" keyword - i've started using c++ 11 little bit more , have few questions on special uses of class keyword. know it's used declare class, there's 2 instances have seen don't understand: method<class t>(); and class class_name *var; why precede typename keyword class in first example, , keyword pointer in sec example? that known elaborated type specifier , necessary when class name "shadowed" or "hidden" , need explicit. class t { }; // love of god don't t t; t t2; if compiler smart, give these warnings: main.cpp:15:5: error: must utilize 'class' tag refer type 't' in scope t t2; ^ class main.cpp:14:7: note: class 't' hidden non-type declaration of 't' here t t; ^ if class not defined, deed forwards declaration. for example: template <typename t> void method() { using type = typename t::value_type; } method...
Read more