ActiveMQ example source code file (DefaultBlobUploadStrategy.java)

This example ActiveMQ source code file (DefaultBlobUploadStrategy.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

defaultblobuploadstrategy, defaultblobuploadstrategy, file, fileinputstream, httpurlconnection, inputstream, io, ioexception, ioexception, jmsexception, net, network, outputstream, put, put, url, url

The ActiveMQ DefaultBlobUploadStrategy.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.blob;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.jms.JMSException;

import org.apache.activemq.command.ActiveMQBlobMessage;

/**
 * A default implementation of {@link BlobUploadStrategy} which uses the URL
 * class to upload files or streams to a remote URL
 */
public class DefaultBlobUploadStrategy extends DefaultStrategy implements BlobUploadStrategy {

    public DefaultBlobUploadStrategy(BlobTransferPolicy transferPolicy) {
        super(transferPolicy);
    }

    public URL uploadFile(ActiveMQBlobMessage message, File file) throws JMSException, IOException {
        return uploadStream(message, new FileInputStream(file));
    }

    public URL uploadStream(ActiveMQBlobMessage message, InputStream fis) throws JMSException, IOException {
        URL url = createMessageURL(message);

        HttpURLConnection connection = (HttpURLConnection)url.openConnection();
        connection.setRequestMethod("PUT");
        connection.setDoOutput(true);

        // use chunked mode or otherwise URLConnection loads everything into
        // memory
        // (chunked mode not supported before JRE 1.5)
        connection.setChunkedStreamingMode(transferPolicy.getBufferSize());

        OutputStream os = connection.getOutputStream();

        byte[] buf = new byte[transferPolicy.getBufferSize()];
        for (int c = fis.read(buf); c != -1; c = fis.read(buf)) {
            os.write(buf, 0, c);
            os.flush();
        }
        os.close();
        fis.close();

        if (!isSuccessfulCode(connection.getResponseCode())) {
            throw new IOException("PUT was not successful: " + connection.getResponseCode() + " "
                                  + connection.getResponseMessage());
        }

        return url;
    }


}