com.adaptris.core.jms.JmsConnectionErrorHandler.java Source code

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Here is the source code for com.adaptris.core.jms.JmsConnectionErrorHandler.java

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/*
 * Copyright 2015 Adaptris Ltd.
 * 
 * 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 com.adaptris.core.jms;

import java.util.concurrent.atomic.AtomicBoolean;

import javax.jms.ExceptionListener;
import javax.jms.JMSException;

import org.apache.commons.lang3.BooleanUtils;

import com.adaptris.annotation.AdvancedConfig;
import com.adaptris.annotation.InputFieldDefault;
import com.adaptris.core.CoreException;
import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * Standard implementation of ConnectionErrorHandler which implements {@link ExceptionListener}.
 * 
 * @config jms-connection-error-handler
 */
@XStreamAlias("jms-connection-error-handler")
public class JmsConnectionErrorHandler extends JmsConnectionErrorHandlerImpl implements ExceptionListener {

    @AdvancedConfig
    @InputFieldDefault(value = "true")
    private Boolean singleExecution;
    private transient AtomicBoolean inOnException = new AtomicBoolean(false);

    public JmsConnectionErrorHandler() {

    }

    public JmsConnectionErrorHandler(Boolean singleExecution) {
        this();
        setSingleExecution(singleExecution);
    }

    @Override
    public void init() throws CoreException {
        super.init();
        try {
            retrieveConnection(JmsConnection.class).currentConnection().setExceptionListener(this);
            inOnException.set(false);
        } catch (JMSException e) {
            throw new CoreException(e);
        }
    }

    @Override
    public void start() throws CoreException {
    }

    @Override
    public void stop() {
    }

    @Override
    public void close() {
    }

    @Override
    public void onException(JMSException e) {
        try {
            Thread.currentThread().setName("JMSExceptionListener for " + idForLogging);
            if (singleExecution()) {
                if (inOnException.compareAndSet(false, true)) {
                    try {
                        retrieveConnection(JmsConnection.class).currentConnection().setExceptionListener(null);
                    } catch (JMSException ignore) {

                    }
                    handleOnException(e);
                } else {
                    log.debug("Already handling an exception; ignoring additional onException()");
                }
            } else {
                handleOnException(e);
            }
        } finally {
            inOnException.set(false);
        }
    }

    private void handleOnException(JMSException e) {
        try {
            log.error("JMS connection exception", e);
            if (e.getLinkedException() != null) {
                log.debug("JMS Linked Exception ", e.getLinkedException());
            }
            handleConnectionException();
        } catch (Exception x) {
            log.error("Unexpected Exception thrown back to onException", x);
        }
    }

    /**
     * @return the singleExecution value.
     */
    public Boolean getSingleExecution() {
        return singleExecution;
    }

    /**
     * Ignore multiple invocations of the {@link ExceptionListener#onException(JMSException)} method.
     * <p>
     * There is no JMS specification guarantee that a provider will not issue multiple calls to
     * {@link ExceptionListener#onException(JMSException)} in short order. In some cases this does happen, which can cause subequent
     * problems based on timing around when the connections re-initialise themselves.
     * </p>
     * 
     * @param b whether or not to filter multiple executions; defaults to true if not specified.
     */
    public void setSingleExecution(Boolean b) {
        this.singleExecution = b;
    }

    boolean singleExecution() {
        return BooleanUtils.toBooleanDefaultIfNull(getSingleExecution(), true);
    }
}