/*
* Copyright 2002-2009 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.jms.core.support;
import javax.jms.ConnectionFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.jms.core.JmsTemplate;
/**
* Convenient super class for application classes that need JMS access.
*
* <p>Requires a ConnectionFactory or a JmsTemplate instance to be set.
* It will create its own JmsTemplate if a ConnectionFactory is passed in.
* A custom JmsTemplate instance can be created for a given ConnectionFactory
* through overriding the {@link #createJmsTemplate} method.
*
* @author Mark Pollack
* @since 1.1.1
* @see #setConnectionFactory
* @see #setJmsTemplate
* @see #createJmsTemplate
* @see org.springframework.jms.core.JmsTemplate
*/
public abstract class JmsGatewaySupport implements InitializingBean {
/** Logger available to subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private JmsTemplate jmsTemplate;
/**
* Set the JMS connection factory to be used by the gateway.
* Will automatically create a JmsTemplate for the given ConnectionFactory.
* @see #createJmsTemplate
* @see #setConnectionFactory(javax.jms.ConnectionFactory)
* @param connectionFactory
*/
public final void setConnectionFactory(ConnectionFactory connectionFactory) {
this.jmsTemplate = createJmsTemplate(connectionFactory);
}
/**
* Create a JmsTemplate for the given ConnectionFactory.
* Only invoked if populating the gateway with a ConnectionFactory reference.
* <p>Can be overridden in subclasses to provide a JmsTemplate instance with
* a different configuration or the JMS 1.0.2 version, JmsTemplate102.
* @param connectionFactory the JMS ConnectionFactory to create a JmsTemplate for
* @return the new JmsTemplate instance
* @see #setConnectionFactory
* @see org.springframework.jms.core.JmsTemplate102
*/
protected JmsTemplate createJmsTemplate(ConnectionFactory connectionFactory) {
return new JmsTemplate(connectionFactory);
}
/**
* Return the JMS ConnectionFactory used by the gateway.
*/
public final ConnectionFactory getConnectionFactory() {
return (this.jmsTemplate != null ? this.jmsTemplate.getConnectionFactory() : null);
}
/**
* Set the JmsTemplate for the gateway.
* @param jmsTemplate
* @see #setConnectionFactory(javax.jms.ConnectionFactory)
*/
public final void setJmsTemplate(JmsTemplate jmsTemplate) {
this.jmsTemplate = jmsTemplate;
}
/**
* Return the JmsTemplate for the gateway.
*/
public final JmsTemplate getJmsTemplate() {
return this.jmsTemplate;
}
public final void afterPropertiesSet() throws IllegalArgumentException, BeanInitializationException {
if (this.jmsTemplate == null) {
throw new IllegalArgumentException("'connectionFactory' or 'jmsTemplate' is required");
}
try {
initGateway();
}
catch (Exception ex) {
throw new BeanInitializationException("Initialization of JMS gateway failed: " + ex.getMessage(), ex);
}
}
/**
* Subclasses can override this for custom initialization behavior.
* Gets called after population of this instance's bean properties.
* @throws java.lang.Exception if initialization fails
*/
protected void initGateway() throws Exception {
}
}
|