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

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Here is the source code for com.adaptris.core.jms.BytesMessageTranslator.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.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.jms.BytesMessage;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageEOFException;

import org.apache.commons.io.IOUtils;

import com.adaptris.annotation.DisplayOrder;
import com.adaptris.core.AdaptrisMessage;
import com.adaptris.util.stream.StreamUtil;
import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * <p>
 * Translates between <code>AdaptrisMessage</code> and <code>javax.jms.BytesMessages</code>.
 * </p>
 * 
 * @config bytes-message-translator
 * 
 */
@XStreamAlias("bytes-message-translator")
@DisplayOrder(order = { "metadataFilter", "moveMetadata", "moveJmsHeaders", "reportAllErrors" })
public class BytesMessageTranslator extends MessageTypeTranslatorImp {

    // Threshold of 50k size to switch to to using an OutputStream impl to copy stuff into the msg proper.
    private static final long STREAM_THRESHOLD = 1024 * 50;
    private transient long streamThreshold = STREAM_THRESHOLD;

    /**
     * <p>
     * Translates an <code>AdaptrisMessage</code> into a <code>BytesMessage</code>.
     * </p>
     * 
     * @param msg the <code>AdaptrisMessage</code> to translate
     * @return a new <code>BytesMessage</code>
     * @throws JMSException
     */
    public Message translate(AdaptrisMessage msg) throws JMSException {
        BytesMessage jmsMsg = session.createBytesMessage();
        if (msg.getSize() > streamThreshold()) {
            try (InputStream in = msg.getInputStream();
                    BytesMessageOutputStream out = new BytesMessageOutputStream(jmsMsg)) {
                StreamUtil.copyAndClose(in, out);
            } catch (IOException e) {
                throw JmsUtils.wrapJMSException(e);
            }
        } else {
            jmsMsg.writeBytes(msg.getPayload());
        }
        return helper.moveMetadata(msg, jmsMsg);
    }

    /**
     * <p>
     * Translates a <code>BytesMessage</code> into an <code>AdaptrisMessage</code>.
     * </p>
     * 
     * @param msg the <code>BytesMessage</code> to translate
     * @return an <code>AdaptrisMessage</code>
     * @throws JMSException
     */
    public AdaptrisMessage translate(Message msg) throws JMSException {
        AdaptrisMessage result = currentMessageFactory().newMessage();
        try (InputStream in = new BytesMessageInputStream((BytesMessage) msg);
                OutputStream out = result.getOutputStream()) {
            IOUtils.copy(in, out);
        } catch (IOException e) {
            throw JmsUtils.wrapJMSException(e);
        }
        return helper.moveMetadata(msg, result);
    }

    long streamThreshold() {
        return streamThreshold;
    }

    private class BytesMessageOutputStream extends OutputStream {
        private final BytesMessage myMsg;

        public BytesMessageOutputStream(BytesMessage message) {
            this.myMsg = message;
        }

        public void write(int b) throws IOException {
            try {
                myMsg.writeByte((byte) b);
            } catch (JMSException ex) {
                throw new IOException(ex);
            }
        }
    }

    private class BytesMessageInputStream extends InputStream {
        private final BytesMessage myMsg;

        BytesMessageInputStream(BytesMessage message) {
            this.myMsg = message;
        }

        @Override
        public int read() throws IOException {
            try {
                byte b = myMsg.readByte();
                return b >= 0 ? b : 256 + b;
            } catch (MessageEOFException ex) {
                return -1;
            } catch (JMSException ex) {
                throw new IOException(ex);
            }
        }
    }
}