Could anybody tel me, why I got TimeoutException when 2 Threads are executing
this code?
| for (int x = 0; x < 1000; x++) {
| tm.begin();
| System.out.println("R" +
Thread.currentThread().getName());
| //inside transaction
| cache.remove("/a");
| System.out.println("AR" +
Thread.currentThread().getName());
| tm.commit();
| //outside transaction
| System.out.println("P" +
Thread.currentThread().getName());
| cache.putObject("/a/b/c/d", "text"+x);
| System.out.println("AP" +
Thread.currentThread().getName());
| }
|
Console Output:
RThread:0
RThread:1
ARThread:1
ARThread:0
PThread:1
PThread:0
APThread:1
RThread:1
org.jboss.cache.lock.TimeoutException: failure acquiring lock: fqn=/a,
caller=GlobalTransaction::3, lock=read owners=[GlobalTransaction::3], write
owner=GlobalTransaction::5 ([EMAIL PROTECTED])
at org.jboss.cache.Node.acquire(Node.java:500)
at
org.jboss.cache.interceptors.PessimisticLockInterceptor.acquireNodeLock(PessimisticLockInterceptor.java:379)
at
org.jboss.cache.interceptors.PessimisticLockInterceptor.lock(PessimisticLockInterceptor.java:307)
at
(...)
Complete code:
| package org.jboss.cache.aop;
|
| import java.util.ArrayList;
| import java.util.List;
|
| import javax.transaction.TransactionManager;
|
| import junit.framework.TestCase;
|
| import org.jboss.cache.DummyTransactionManagerLookup;
| import org.jboss.cache.TreeCache;
| import org.jboss.cache.lock.IsolationLevel;
|
| public class ConcurentPutRemoveTest extends TestCase {
|
| private TransactionManager tm;
|
| public ConcurentPutRemoveTest(String s) {
| super(s);
| }
|
| private PojoCache cache;
|
| protected void setUp() throws Exception {
| cache = new PojoCache();
| cache.setCacheMode(TreeCache.LOCAL);
| cache.setIsolationLevel(IsolationLevel.READ_COMMITTED);
| cache.setTransactionManagerLookup(new
DummyTransactionManagerLookup());
| cache.setLockAcquisitionTimeout(10000);
| cache.create();
| cache.start();
| tm = cache.getTransactionManager();
| }
|
| protected void tearDown() throws Exception {
| super.tearDown();
| cache.stop();
| cache.destroy();
| }
|
| public void testLock() throws Exception {
| List<SeparateThread> threads = new ArrayList<SeparateThread>();
| for (int x = 0; x < 2; x++) {
| SeparateThread t = new SeparateThread(x);
| threads.add(t);
| t.start();
| }
| for (SeparateThread separateThread : threads) {
| separateThread.join();
| if (separateThread.getException() != null) {
| throw separateThread.getException();
| }
| }
|
| }
|
| private class SeparateThread extends Thread {
| Exception e = null;
|
| private int num = 0;
|
| public SeparateThread(int num) {
| this.num = num;
| }
|
| public Exception getException() {
| return e;
| }
|
| public void run() {
| Thread.currentThread().setName("Thread:" + num);
| try {
| for (int x = 0; x < 1000; x++) {
| tm.begin();
| System.out.println("R" +
Thread.currentThread().getName());
| //inside transaction
| cache.remove("/a");
| System.out.println("AR" +
Thread.currentThread().getName());
| tm.commit();
| //outside transaction
| System.out.println("P" +
Thread.currentThread().getName());
| cache.putObject("/a/b/c/d", "text"+x);
| System.out.println("AP" +
Thread.currentThread().getName());
| }
| } catch (Exception e) {
| this.e = e;
| }
| }
| }
|
| }
|
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