Hi all,
I have a bit of a show-stopper of a problem here. Code will follow, but I'll
explain it quickly first.
I have a ValueObject, which contains an IdObject that is a unique ID. Both
objects implement toString(), equals() and hashCode(), as any good object
should. Both objects are also advisable.
I have a HashMap that will contain ValueObjects, keyed by their respective
IdObject. The HashMap is put into the cache using putObject().
This results in an infinite loop. Very basically, the problem is that IdObject
is part of the FQN (as it's the key in the HashMap) and IdObject implements
hashCode() (and toString()), which references an advisable field (id).
I would include a stack trace, but I've totally run out of time. The following
should all be compilable, so you can see exactly what's happening.
Here's the code.
| public class IdObject{
|
| private String id;
|
| public IdObject() {
| } // IdObject
|
| public IdObject(String aId) {
| id = aId;
| } // IdObject
|
| public String toString() {
| return id;
| } // toString
|
| public boolean equals(Object aObject) {
| boolean result = false;
|
| if ((aObject != null) &&
| (aObject.getClass().getName().equals( this.getClass().getName())))
{
| if (id.equals(((IdObject)aObject).id)) {
| result = true;
| } // if
| } // if
|
| return result;
| } // equals
|
| public int hashCode() {
| return id.hashCode();
| } // hashCode
|
| } // class IdObject
|
| public class ValueObject {
|
| private IdObject idObj;
| private float value;
|
| public ValueObject() {
| } // ValueObject
|
| public ValueObject(IdObject aIdObj, float aValue) {
| idObj = aIdObj;
| value = aValue;
| } // ValueObject
|
| public IdObject getIdObj() {
| return idObj;
| }
|
| public float getValue() {
| return value;
| }
|
| public String toString() {
| return idObj + ": " + value;
| } // toString
|
| public boolean equals(Object aObject) {
| boolean result = false;
|
| if ((aObject != null) &&
| (aObject.getClass().getName().equals( this.getClass().getName())))
{
| result = idObj.equals(((ValueObject)aObject).idObj);
| } // if
|
| return result;
| } // equals
|
| public int hashCode() {
| return idObj.hashCode();
| } // hashCode
|
| } // class ValueObject
|
| import org.jboss.cache.*;
| import org.jboss.cache.aop.*;
| import java.util.*;
|
| public class TestRunner {
| private static final String CONFIG_FILENAME = "data/cacheConfig.xml";
| private TreeCacheAop treeCache;
|
| private Map cachedMap;
|
| public TestRunner() {
| initCache();
|
| IdObject idObj1 = new IdObject("1");
| ValueObject obj1 = new ValueObject(idObj1, 3343.23f);
| cachedMap.put(idObj1, obj1); // <---- Infinite loop here
| } // TestRunner
|
| private void initCache() {
| try {
| treeCache = new TreeCacheAop();
|
| PropertyConfigurator cacheConfig = new PropertyConfigurator();
| cacheConfig.configure(treeCache, CONFIG_FILENAME);
|
| treeCache.startService();
|
| treeCache.putObject("test", new HashMap());
| cachedMap = (Map)treeCache.getObject("test");
| } // try
| catch ( Exception x ) {
| x.printStackTrace();
| System.exit( 1 );
| } // catch
| } // initCache
|
| public static void main( String[] aArgs ) {
| new TestRunner();
| } // main
|
| } // class TestRunner
|
Cache Config:
| <?xml version="1.0" encoding="UTF-8"?>
| <server>
| <classpath codebase="C:/Java/jboss-cache/lib"
archives="jboss-cache.jar, jgroups.jar"/>
| <mbean code="org.jboss.cache.TreeCache"
| name="jboss.cache:service=TreeCache">
| <attribute name="CacheMode">LOCAL</attribute>
| </mbean>
| </server>
|
AOP file:
| <?xml version="1.0" encoding="UTF-8"?>
| <aop>
| <prepare expr="field(* $instanceof{ValueObject}->*)" />
| <prepare expr="field(* $instanceof{IdObject}->*)" />
| </aop>
|
View the original post :
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3854395#3854395
Reply to the post :
http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3854395
-------------------------------------------------------
This SF.Net email is sponsored by:
Sybase ASE Linux Express Edition - download now for FREE
LinuxWorld Reader's Choice Award Winner for best database on Linux.
http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click
_______________________________________________
JBoss-Development mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/jboss-development
