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JobLockService implementation
- Provides transaction-aware locking - Post-transaction cleanup is automatically done - Retrying for lock acquisition is handled internally as well - Downgraded the lock concurrency tests for the build machine (maybe 50 threads was too much) - Deadlock tests added for the high-level locking git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@13968 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Derek Hulley
287
source/java/org/alfresco/repo/lock/JobLockServiceTest.java
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287
source/java/org/alfresco/repo/lock/JobLockServiceTest.java
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/*
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* Copyright (C) 2005-2009 Alfresco Software Limited.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* As a special exception to the terms and conditions of version 2.0 of
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* the GPL, you may redistribute this Program in connection with Free/Libre
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* and Open Source Software ("FLOSS") applications as described in Alfresco's
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* FLOSS exception. You should have recieved a copy of the text describing
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* the FLOSS exception, and it is also available here:
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* http://www.alfresco.com/legal/licensing"
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*/
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package org.alfresco.repo.lock;
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import junit.framework.TestCase;
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import org.alfresco.repo.domain.locks.LockDAO;
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import org.alfresco.repo.transaction.RetryingTransactionHelper;
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import org.alfresco.repo.transaction.RetryingTransactionHelper.RetryingTransactionCallback;
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import org.alfresco.service.ServiceRegistry;
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import org.alfresco.service.namespace.QName;
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import org.alfresco.service.transaction.TransactionService;
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import org.alfresco.util.ApplicationContextHelper;
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import org.springframework.context.ApplicationContext;
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/**
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* Tests the high-level capabilities provided by the service implementation. The DAO tests
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* stress the underlying database work, so we only need to deal with deadlock resolution, etc.
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*
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* @see JobLockService the service being tested
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* @see LockDAO the DAO being indirectly tested
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*
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* @author Derek Hulley
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* @since 3.2
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*/
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public class JobLockServiceTest extends TestCase
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{
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public static final String NAMESPACE = "http://www.alfresco.org/test/JobLockServiceTest";
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private ApplicationContext ctx = ApplicationContextHelper.getApplicationContext();
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private TransactionService transactionService;
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private RetryingTransactionHelper txnHelper;
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private JobLockService jobLockService;
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// Lock names for the tests
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private QName lockA;
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private QName lockAA;
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private QName lockAAA;
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private QName lockAAB;
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private QName lockAAC;
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private QName lockAB;
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private QName lockABA;
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private QName lockABB;
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private QName lockABC;
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@Override
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public void setUp() throws Exception
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{
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ServiceRegistry serviceRegistry = (ServiceRegistry) ctx.getBean(ServiceRegistry.SERVICE_REGISTRY);
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transactionService = serviceRegistry.getTransactionService();
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txnHelper = transactionService.getRetryingTransactionHelper();
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jobLockService = (JobLockService) ctx.getBean("jobLockService");
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// Get the test name
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String testName = getName();
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// Build lock names for the test
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lockA = QName.createQName(NAMESPACE, "a-" + testName);
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lockAA = QName.createQName(NAMESPACE, "a-" + testName + ".a-" + testName);
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lockAAA = QName.createQName(NAMESPACE, "a-" + testName + ".a-" + testName + ".a-" + testName);
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lockAAB = QName.createQName(NAMESPACE, "a-" + testName + ".a-" + testName + ".b-" + testName);
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lockAAC = QName.createQName(NAMESPACE, "a-" + testName + ".a-" + testName + ".c-" + testName);
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lockAB = QName.createQName(NAMESPACE, "a-" + testName + ".b-" + testName);
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lockABA = QName.createQName(NAMESPACE, "a-" + testName + ".b-" + testName + ".a-" + testName);
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lockABB = QName.createQName(NAMESPACE, "a-" + testName + ".b-" + testName + ".b-" + testName);
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lockABC = QName.createQName(NAMESPACE, "a-" + testName + ".b-" + testName + ".c-" + testName);
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}
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public void testSetUp()
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{
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assertNotNull(jobLockService);
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}
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public void testEnforceTxn()
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{
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try
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{
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jobLockService.getTransacionalLock(lockAAA, 50L);
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fail("Service did not enforce the presence of a transaction");
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}
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catch (IllegalStateException e)
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{
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// Expected
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}
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}
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/**
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* Checks that the lock can be aquired by a read-only transaction i.e. that locking is
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* independent of the outer transaction.
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*/
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public void testLockInReadOnly() throws Exception
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{
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RetryingTransactionCallback<Object> lockCallback = new RetryingTransactionCallback<Object>()
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{
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public Object execute() throws Throwable
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{
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jobLockService.getTransacionalLock(lockAAA, 500);
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return null;
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}
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};
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txnHelper.doInTransaction(lockCallback, true, true);
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}
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/**
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* Checks that locks are released on commit
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*/
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public void testLockReleaseOnCommit() throws Exception
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{
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RetryingTransactionCallback<Object> lockCallback = new RetryingTransactionCallback<Object>()
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{
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public Object execute() throws Throwable
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{
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jobLockService.getTransacionalLock(lockAAA, 5000);
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return null;
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}
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};
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txnHelper.doInTransaction(lockCallback, true, true);
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// The lock should be free now, even though the TTL was high
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RetryingTransactionCallback<Object> lockCheckCallback = new RetryingTransactionCallback<Object>()
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{
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public Object execute() throws Throwable
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{
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jobLockService.getTransacionalLock(lockAAA, 50);
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return null;
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}
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};
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txnHelper.doInTransaction(lockCheckCallback, true, true);
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}
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/**
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* Checks that locks are released on rollback
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*/
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public void testLockReleaseOnRollback() throws Exception
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{
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RetryingTransactionCallback<Object> lockCallback = new RetryingTransactionCallback<Object>()
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{
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public Object execute() throws Throwable
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{
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jobLockService.getTransacionalLock(lockAAA, 5000);
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throw new UnsupportedOperationException("ALERT!");
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}
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};
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try
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{
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txnHelper.doInTransaction(lockCallback, true, true);
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fail("Expected transaction failure");
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}
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catch (UnsupportedOperationException e)
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{
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// Expected
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}
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// The lock should be free now, even though the TTL was high
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RetryingTransactionCallback<Object> lockCheckCallback = new RetryingTransactionCallback<Object>()
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{
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public Object execute() throws Throwable
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{
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jobLockService.getTransacionalLock(lockAAA, 50);
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return null;
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}
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};
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txnHelper.doInTransaction(lockCheckCallback, true, true);
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}
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/**
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* Sets up two threads in a deadlock scenario. Each of the threads has a long wait timeout
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* for the required locks. If there were a deadlock, the shorter of the the wait times would
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* be how long it would take before one of them is thrown out. Firstly, we check that one
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* of the threads <i>is</i> thrown out. Then we check that the thread is thrown out quickly.
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*/
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public synchronized void testDeadlockPrevention() throws Throwable
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{
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DeadlockingThread t1 = new DeadlockingThread(lockAAA, lockAAB);
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DeadlockingThread t2 = new DeadlockingThread(lockAAB, lockAAA);
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// Start them
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t1.start();
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t2.start();
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// They can take their first locks (there should be no contention)
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t1.incrementNextLock();
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t2.incrementNextLock();
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// Wait for them to do this
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try { this.wait(2000L); } catch (InterruptedException e) {}
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// Advance again
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t1.incrementNextLock();
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t2.incrementNextLock();
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// Wait for them to do this
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try { this.wait(2000L); } catch (InterruptedException e) {}
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// Advance again, to end threads
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t1.incrementNextLock();
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t2.incrementNextLock();
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// Wait for them to end (commit/rollback)
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try { this.wait(2000L); } catch (InterruptedException e) {}
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if (t1.otherFailure != null)
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{
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throw t1.otherFailure;
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}
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if (t2.otherFailure != null)
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{
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throw t2.otherFailure;
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}
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assertNull("T1 should have succeeded as the ordered locker: " + t1.lockFailure, t1.lockFailure);
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assertNotNull("T2 should have failed as the unordered locker.", t2.lockFailure);
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}
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private class DeadlockingThread extends Thread
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{
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private final QName[] lockQNames;
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private volatile int nextLock = -1;
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private LockAcquisitionException lockFailure;
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private Throwable otherFailure;
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private DeadlockingThread(QName ... lockQNames)
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{
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super("DeadlockingThread");
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this.lockQNames = lockQNames;
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setDaemon(true);
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}
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private void incrementNextLock()
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{
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nextLock++;
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}
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@Override
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public void run()
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{
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RetryingTransactionCallback<Object> runCallback = new RetryingTransactionCallback<Object>()
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{
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public synchronized Object execute() throws Throwable
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{
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int currentLock = -1;
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// Take the locks in turn, quitting when told to take a lock that's not there
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while (currentLock < lockQNames.length - 1)
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{
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// Check if we have been instructed to take a lock
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if (nextLock > currentLock)
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{
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// Advance and grab the lock
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currentLock++;
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jobLockService.getTransacionalLock(lockQNames[currentLock], 5000L);
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}
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else
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{
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// No advance, so wait a bit more
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try { this.wait(20L); } catch (InterruptedException e) {}
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}
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}
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return null;
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}
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};
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try
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{
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txnHelper.doInTransaction(runCallback, true);
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}
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catch (LockAcquisitionException e)
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{
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lockFailure = e;
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}
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catch (Throwable e)
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{
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otherFailure = e;
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}
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}
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}
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}
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