/*
* Copyright 2002-2008 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.jca.work;
import javax.naming.NamingException;
import javax.resource.spi.BootstrapContext;
import javax.resource.spi.work.ExecutionContext;
import javax.resource.spi.work.Work;
import javax.resource.spi.work.WorkException;
import javax.resource.spi.work.WorkListener;
import javax.resource.spi.work.WorkManager;
import javax.resource.spi.work.WorkRejectedException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.task.AsyncTaskExecutor;
import org.springframework.core.task.TaskRejectedException;
import org.springframework.core.task.TaskTimeoutException;
import org.springframework.jca.context.BootstrapContextAware;
import org.springframework.jndi.JndiLocatorSupport;
import org.springframework.scheduling.SchedulingException;
import org.springframework.scheduling.SchedulingTaskExecutor;
import org.springframework.util.Assert;
/**
* {@link org.springframework.core.task.TaskExecutor} implementation
* that delegates to a JCA 1.5 WorkManager, implementing the
* {@link javax.resource.spi.work.WorkManager} interface.
*
* <p>This is mainly intended for use within a JCA ResourceAdapter implementation,
* but may also be used in a standalone environment, delegating to a locally
* embedded WorkManager implementation (such as Geronimo's).
*
* <p>Also implements the JCA 1.5 WorkManager interface itself, delegating all
* calls to the target WorkManager. Hence, a caller can choose whether it wants
* to talk to this executor through the Spring TaskExecutor interface or the
* JCA 1.5 WorkManager interface.
*
* <p>This adapter is also capable of obtaining a JCA WorkManager from JNDI.
* This is for example appropriate on the Geronimo application server, where
* WorkManager GBeans (e.g. Geronimo's default "DefaultWorkManager" GBean)
* can be linked into the J2EE environment through "gbean-ref" entries
* in the <code>geronimo-web.xml</code> deployment descriptor.
*
* <p><b>On JBoss and GlassFish, obtaining the default JCA WorkManager
* requires special lookup steps.</b> See the
* {@link org.springframework.jca.work.jboss.JBossWorkManagerTaskExecutor}
* {@link org.springframework.jca.work.glassfish.GlassFishWorkManagerTaskExecutor}
* classes which are the direct equivalent of this generic JCA adapter class.
*
* @author Juergen Hoeller
* @since 2.0.3
* @see #setWorkManager
* @see javax.resource.spi.work.WorkManager#scheduleWork
*/
public class WorkManagerTaskExecutor extends JndiLocatorSupport
implements SchedulingTaskExecutor, AsyncTaskExecutor, WorkManager, BootstrapContextAware, InitializingBean {
private WorkManager workManager;
private String workManagerName;
private boolean blockUntilStarted = false;
private boolean blockUntilCompleted = false;
private WorkListener workListener;
/**
* Create a new WorkManagerTaskExecutor, expecting bean-style configuration.
* @see #setWorkManager
*/
public WorkManagerTaskExecutor() {
}
/**
* Create a new WorkManagerTaskExecutor for the given WorkManager.
* @param workManager the JCA WorkManager to delegate to
*/
public WorkManagerTaskExecutor(WorkManager workManager) {
setWorkManager(workManager);
}
/**
* Specify the JCA WorkManager instance to delegate to.
*/
public void setWorkManager(WorkManager workManager) {
Assert.notNull(workManager, "WorkManager must not be null");
this.workManager = workManager;
}
/**
* Set the JNDI name of the JCA WorkManager.
* <p>This can either be a fully qualified JNDI name,
* or the JNDI name relative to the current environment
* naming context if "resourceRef" is set to "true".
* @see #setWorkManager
* @see #setResourceRef
*/
public void setWorkManagerName(String workManagerName) {
this.workManagerName = workManagerName;
}
/**
* Specify the JCA BootstrapContext that contains the
* WorkManager to delegate to.
*/
public void setBootstrapContext(BootstrapContext bootstrapContext) {
Assert.notNull(bootstrapContext, "BootstrapContext must not be null");
this.workManager = bootstrapContext.getWorkManager();
}
/**
* Set whether to let {@link #execute} block until the work
* has been actually started.
* <p>Uses the JCA <code>startWork</code> operation underneath,
* instead of the default <code>scheduleWork</code>.
* @see javax.resource.spi.work.WorkManager#startWork
* @see javax.resource.spi.work.WorkManager#scheduleWork
*/
public void setBlockUntilStarted(boolean blockUntilStarted) {
this.blockUntilStarted = blockUntilStarted;
}
/**
* Set whether to let {@link #execute} block until the work
* has been completed.
* <p>Uses the JCA <code>doWork</code> operation underneath,
* instead of the default <code>scheduleWork</code>.
* @see javax.resource.spi.work.WorkManager#doWork
* @see javax.resource.spi.work.WorkManager#scheduleWork
*/
public void setBlockUntilCompleted(boolean blockUntilCompleted) {
this.blockUntilCompleted = blockUntilCompleted;
}
/**
* Specify a JCA 1.5 WorkListener to apply, if any.
* <p>This shared WorkListener instance will be passed on to the
* WorkManager by all {@link #execute} calls on this TaskExecutor.
*/
public void setWorkListener(WorkListener workListener) {
this.workListener = workListener;
}
public void afterPropertiesSet() throws NamingException {
if (this.workManager == null) {
if (this.workManagerName != null) {
this.workManager = (WorkManager) lookup(this.workManagerName, WorkManager.class);
}
else {
this.workManager = getDefaultWorkManager();
}
}
}
/**
* Obtain a default WorkManager to delegate to.
* Called if no explicit WorkManager or WorkManager JNDI name has been specified.
* <p>The default implementation returns a {@link SimpleTaskWorkManager}.
* Can be overridden in subclasses.
*/
protected WorkManager getDefaultWorkManager() {
return new SimpleTaskWorkManager();
}
//-------------------------------------------------------------------------
// Implementation of the Spring SchedulingTaskExecutor interface
//-------------------------------------------------------------------------
public void execute(Runnable task) {
execute(task, TIMEOUT_INDEFINITE);
}
public void execute(Runnable task, long startTimeout) {
Assert.state(this.workManager != null, "No WorkManager specified");
Work work = new DelegatingWork(task);
try {
if (this.blockUntilCompleted) {
if (startTimeout != TIMEOUT_INDEFINITE || this.workListener != null) {
this.workManager.doWork(work, startTimeout, null, this.workListener);
}
else {
this.workManager.doWork(work);
}
}
else if (this.blockUntilStarted) {
if (startTimeout != TIMEOUT_INDEFINITE || this.workListener != null) {
this.workManager.startWork(work, startTimeout, null, this.workListener);
}
else {
this.workManager.startWork(work);
}
}
else {
if (startTimeout != TIMEOUT_INDEFINITE || this.workListener != null) {
this.workManager.scheduleWork(work, startTimeout, null, this.workListener);
}
else {
this.workManager.scheduleWork(work);
}
}
}
catch (WorkRejectedException ex) {
if (WorkException.START_TIMED_OUT.equals(ex.getErrorCode())) {
throw new TaskTimeoutException("JCA WorkManager rejected task because of timeout: " + task, ex);
}
else {
throw new TaskRejectedException("JCA WorkManager rejected task: " + task, ex);
}
}
catch (WorkException ex) {
throw new SchedulingException("Could not schedule task on JCA WorkManager", ex);
}
}
/**
* This task executor prefers short-lived work units.
*/
public boolean prefersShortLivedTasks() {
return true;
}
//-------------------------------------------------------------------------
// Implementation of the JCA WorkManager interface
//-------------------------------------------------------------------------
public void doWork(Work work) throws WorkException {
this.workManager.doWork(work);
}
public void doWork(Work work, long delay, ExecutionContext executionContext, WorkListener workListener)
throws WorkException {
this.workManager.doWork(work, delay, executionContext, workListener);
}
public long startWork(Work work) throws WorkException {
return this.workManager.startWork(work);
}
public long startWork(Work work, long delay, ExecutionContext executionContext, WorkListener workListener)
throws WorkException {
return this.workManager.startWork(work, delay, executionContext, workListener);
}
public void scheduleWork(Work work) throws WorkException {
this.workManager.scheduleWork(work);
}
public void scheduleWork(Work work, long delay, ExecutionContext executionContext, WorkListener workListener)
throws WorkException {
this.workManager.scheduleWork(work, delay, executionContext, workListener);
}
}