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ActiveMQ example source code file (DataManagerFacade.java)

This example ActiveMQ source code file (DataManagerFacade.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

bytesequence, bytesequence, databytearrayoutputstream, datamanagerfacade, io, ioexception, ioexception, location, location, marshaller, object, storelocation, storelocation, storelocationfacade, string

The ActiveMQ DataManagerFacade.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.kaha.impl.async;

import java.io.IOException;

import org.apache.activemq.kaha.Marshaller;
import org.apache.activemq.kaha.StoreLocation;
import org.apache.activemq.kaha.impl.data.RedoListener;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.util.DataByteArrayInputStream;
import org.apache.activemq.util.DataByteArrayOutputStream;

/**
 * Provides a Kaha DataManager Facade to the DataManager.
 * 
 * 
 */
public final class DataManagerFacade implements org.apache.activemq.kaha.impl.DataManager {

    private static final ByteSequence FORCE_COMMAND = new ByteSequence(new byte[] {'F', 'O', 'R', 'C', 'E'});

    private AsyncDataManager dataManager;
    private final String name;
    private Marshaller redoMarshaller;

    private static class StoreLocationFacade implements StoreLocation {
        private final Location location;

        public StoreLocationFacade(Location location) {
            this.location = location;
        }

        public int getFile() {
            return location.getDataFileId();
        }

        public long getOffset() {
            return location.getOffset();
        }

        public int getSize() {
            return location.getSize();
        }

        public Location getLocation() {
            return location;
        }
    }

    public DataManagerFacade(AsyncDataManager dataManager, String name) {
        this.dataManager = dataManager;
        this.name = name;
    }

    private static StoreLocation convertToStoreLocation(Location location) {
        if (location == null) {
            return null;
        }
        return new StoreLocationFacade(location);
    }

    private static Location convertFromStoreLocation(StoreLocation location) {

        if (location == null) {
            return null;
        }

        if (location.getClass() == StoreLocationFacade.class) {
            return ((StoreLocationFacade)location).getLocation();
        }

        Location l = new Location();
        l.setOffset((int)location.getOffset());
        l.setSize(location.getSize());
        l.setDataFileId(location.getFile());
        return l;
    }


    public Object readItem(Marshaller marshaller, StoreLocation location) throws IOException {
        ByteSequence sequence = dataManager.read(convertFromStoreLocation(location));
        DataByteArrayInputStream dataIn = new DataByteArrayInputStream(sequence);
        return marshaller.readPayload(dataIn);
    }

    public StoreLocation storeDataItem(Marshaller marshaller, Object payload) throws IOException {
        final DataByteArrayOutputStream buffer = new DataByteArrayOutputStream();
        marshaller.writePayload(payload, buffer);
        ByteSequence data = buffer.toByteSequence();
        return convertToStoreLocation(dataManager.write(data, (byte)1, false));
    }

    public void force() throws IOException {
        dataManager.write(FORCE_COMMAND, (byte)2, true);
    }

    public void updateItem(StoreLocation location, Marshaller marshaller, Object payload) throws IOException {
        final DataByteArrayOutputStream buffer = new DataByteArrayOutputStream();
        marshaller.writePayload(payload, buffer);
        ByteSequence data = buffer.toByteSequence();
        dataManager.update(convertFromStoreLocation(location), data, false);
    }

    public void close() throws IOException {
        dataManager.close();
    }

    public void consolidateDataFiles() throws IOException {
        dataManager.consolidateDataFiles();
    }

    public boolean delete() throws IOException {
        return dataManager.delete();
    }

    public void addInterestInFile(int file) throws IOException {
        dataManager.addInterestInFile(file);
    }

    public void removeInterestInFile(int file) throws IOException {
        dataManager.removeInterestInFile(file);
    }

    public void recoverRedoItems(RedoListener listener) throws IOException {
        throw new RuntimeException("Not Implemented..");
    }

    public StoreLocation storeRedoItem(Object payload) throws IOException {
        throw new RuntimeException("Not Implemented..");
    }

    public Marshaller getRedoMarshaller() {
        return redoMarshaller;
    }

    public void setRedoMarshaller(Marshaller redoMarshaller) {
        this.redoMarshaller = redoMarshaller;
    }

    public String getName() {
        return name;
    }

}

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