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ActiveMQ example source code file (ActiveMQTextMessage.java)

This example ActiveMQ source code file (ActiveMQTextMessage.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqtextmessage, activemqtextmessage, bytearrayoutputstream, bytesequence, datainputstream, dataoutputstream, hashmap, io, ioexception, ioexception, jmsexception, jmsexception, object, string, string, util, zip

The ActiveMQ ActiveMQTextMessage.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.activemq.command;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.InflaterInputStream;

import javax.jms.JMSException;
import javax.jms.MessageNotWriteableException;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.util.ByteArrayInputStream;
import org.apache.activemq.util.ByteArrayOutputStream;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.util.JMSExceptionSupport;
import org.apache.activemq.util.MarshallingSupport;
import org.apache.activemq.wireformat.WireFormat;

/**
 * @openwire:marshaller code="28"
 *
 */
public class ActiveMQTextMessage extends ActiveMQMessage implements TextMessage {

    public static final byte DATA_STRUCTURE_TYPE = CommandTypes.ACTIVEMQ_TEXT_MESSAGE;

    protected String text;

    public Message copy() {
        ActiveMQTextMessage copy = new ActiveMQTextMessage();
        copy(copy);
        return copy;
    }

    private void copy(ActiveMQTextMessage copy) {
        super.copy(copy);
        copy.text = text;
    }

    public byte getDataStructureType() {
        return DATA_STRUCTURE_TYPE;
    }

    public String getJMSXMimeType() {
        return "jms/text-message";
    }

    public void setText(String text) throws MessageNotWriteableException {
        checkReadOnlyBody();
        this.text = text;
        setContent(null);
    }

    public String getText() throws JMSException {
        if (text == null && getContent() != null) {
            InputStream is = null;
            try {
                ByteSequence bodyAsBytes = getContent();
                if (bodyAsBytes != null) {
                    is = new ByteArrayInputStream(bodyAsBytes);
                    if (isCompressed()) {
                        is = new InflaterInputStream(is);
                    }
                    DataInputStream dataIn = new DataInputStream(is);
                    text = MarshallingSupport.readUTF8(dataIn);
                    dataIn.close();
                    setContent(null);
                    setCompressed(false);
                }
            } catch (IOException ioe) {
                throw JMSExceptionSupport.create(ioe);
            } finally {
                if (is != null) {
                    try {
                        is.close();
                    } catch (IOException e) {
                        // ignore
                    }
                }
            }
        }
        return text;
    }

    public void beforeMarshall(WireFormat wireFormat) throws IOException {
        super.beforeMarshall(wireFormat);

        ByteSequence content = getContent();
        if (content == null && text != null) {
            ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
            OutputStream os = bytesOut;
            ActiveMQConnection connection = getConnection();
            if (connection != null && connection.isUseCompression()) {
                compressed = true;
                os = new DeflaterOutputStream(os);
            }
            DataOutputStream dataOut = new DataOutputStream(os);
            MarshallingSupport.writeUTF8(dataOut, this.text);
            dataOut.close();
            setContent(bytesOut.toByteSequence());
        }
    }

    // see https://issues.apache.org/activemq/browse/AMQ-2103
    // and https://issues.apache.org/activemq/browse/AMQ-2966
    public void clearMarshalledState() throws JMSException {
        super.clearMarshalledState();
        this.text = null;
    }

    /**
     * Clears out the message body. Clearing a message's body does not clear its
     * header values or property entries. <p/>
     * <P>
     * If this message body was read-only, calling this method leaves the
     * message body in the same state as an empty body in a newly created
     * message.
     *
     * @throws JMSException if the JMS provider fails to clear the message body
     *                 due to some internal error.
     */
    public void clearBody() throws JMSException {
        super.clearBody();
        this.text = null;
    }

    public int getSize() {
        if (size == 0 && content == null && text != null) {
            size = getMinimumMessageSize();
            if (marshalledProperties != null) {
                size += marshalledProperties.getLength();
            }
            size += text.length() * 2;
        }
        return super.getSize();
    }

    public String toString() {
        try {
            String text = getText();
            if (text != null) {
                text = MarshallingSupport.truncate64(text);
                HashMap<String, Object> overrideFields = new HashMap();
                overrideFields.put("text", text);
                return super.toString(overrideFields);
            }
        } catch (JMSException e) {
        }
        return super.toString();
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ ActiveMQTextMessage.java source code file:

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