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ActiveMQ example source code file (DataFileGenerator.java)

This example ActiveMQ source code file (DataFileGenerator.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

arraylist, arraylist, control_dir, datafilegenerator, dataoutputstream, exception, exception, file, file, fileoutputstream, io, iterator, module_base_dir, openwireformat, openwireformat, util

The ActiveMQ DataFileGenerator.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.openwire;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;

import junit.framework.Assert;

public abstract class DataFileGenerator extends Assert {

    static final File MODULE_BASE_DIR;
    static final File CONTROL_DIR;
    static final File CLASS_FILE_DIR;

    static {
        MODULE_BASE_DIR = new File(System.getProperty("basedir", "."));
        CONTROL_DIR = new File(MODULE_BASE_DIR, "src/test/resources/openwire-control");
        CLASS_FILE_DIR = new File(MODULE_BASE_DIR, "src/test/java/org/apache/activemq/openwire");
    }

    public static void main(String[] args) throws Exception {
        generateControlFiles();
    }

    /**
     * @param srcdir
     * @return
     * @throws ClassNotFoundException
     * @throws InstantiationException
     * @throws IllegalAccessException
     */
    public static ArrayList getAllDataFileGenerators() throws Exception {
        // System.out.println("Looking for generators in : "+classFileDir);
        ArrayList l = new ArrayList();
        File[] files = CLASS_FILE_DIR.listFiles();
        for (int i = 0; files != null && i < files.length; i++) {
            File file = files[i];
            if (file.getName().endsWith("Data.java")) {
                String cn = file.getName();
                cn = cn.substring(0, cn.length() - ".java".length());
                Class clazz = DataFileGenerator.class.getClassLoader().loadClass("org.apache.activemq.openwire." + cn);
                l.add((DataFileGenerator)clazz.newInstance());
            }
        }
        return l;
    }

    private static void generateControlFiles() throws Exception {
        ArrayList generators = getAllDataFileGenerators();
        for (Iterator iter = generators.iterator(); iter.hasNext();) {
            DataFileGenerator object = (DataFileGenerator)iter.next();
            try {
                // System.out.println("Processing: "+object.getClass());
                object.generateControlFile();
            } catch (Exception e) {
                // System.err.println("Error while processing:
                // "+object.getClass() + ". Reason: " + e);
            }
        }
    }

    public void generateControlFile() throws Exception {
        CONTROL_DIR.mkdirs();
        File dataFile = new File(CONTROL_DIR, getClass().getName() + ".bin");

        OpenWireFormat wf = new OpenWireFormat();
        wf.setCacheEnabled(false);
        wf.setStackTraceEnabled(false);
        wf.setVersion(1);

        FileOutputStream os = new FileOutputStream(dataFile);
        DataOutputStream ds = new DataOutputStream(os);
        wf.marshal(createObject(), ds);
        ds.close();
    }

    public InputStream generateInputStream() throws Exception {
        OpenWireFormat wf = new OpenWireFormat();
        wf.setCacheEnabled(false);
        wf.setStackTraceEnabled(false);
        wf.setVersion(1);

        ByteArrayOutputStream os = new ByteArrayOutputStream();
        DataOutputStream ds = new DataOutputStream(os);
        wf.marshal(createObject(), ds);
        ds.close();

        return new ByteArrayInputStream(os.toByteArray());
    }

    public static void assertAllControlFileAreEqual() throws Exception {
        ArrayList generators = getAllDataFileGenerators();
        for (Iterator iter = generators.iterator(); iter.hasNext();) {
            DataFileGenerator object = (DataFileGenerator)iter.next();
            // System.out.println("Processing: "+object.getClass());
            object.assertControlFileIsEqual();
        }
    }

    public void assertControlFileIsEqual() throws Exception {
        File dataFile = new File(CONTROL_DIR, getClass().getName() + ".bin");
        FileInputStream is1 = new FileInputStream(dataFile);
        int pos = 0;
        try {
            InputStream is2 = generateInputStream();
            int a = is1.read();
            int b = is2.read();
            pos++;
            assertEquals("Data does not match control file: " + dataFile + " at byte position " + pos, a, b);
            while (a >= 0 && b >= 0) {
                a = is1.read();
                b = is2.read();
                pos++;
                assertEquals(a, b);
            }
            is2.close();
        } finally {
            is1.close();
        }
    }

    protected abstract Object createObject() throws IOException;
}

Other ActiveMQ examples (source code examples)

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