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ActiveMQ example source code file (SystemUsage.java)

This example ActiveMQ source code file (SystemUsage.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

copyonwritearraylist, memoryusage, memoryusage, override, persistenceadapter, pliststore, storeusage, string, string, systemusage, systemusage, tempusage, tempusage, threading, threadpoolexecutor, threads, util

The ActiveMQ SystemUsage.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.usage;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.activemq.Service;
import org.apache.activemq.store.PersistenceAdapter;
import org.apache.activemq.store.kahadb.plist.PListStore;

/**
 * Holder for Usage instances for memory, store and temp files Main use case is
 * manage memory usage.
 * 
 * @org.apache.xbean.XBean
 * 
 */
public class SystemUsage implements Service {

    private SystemUsage parent;
    private String name;
    private MemoryUsage memoryUsage;
    private StoreUsage storeUsage;
    private TempUsage tempUsage;
    private ThreadPoolExecutor executor;

    /**
     * True if someone called setSendFailIfNoSpace() on this particular usage
     * manager
     */
    private boolean sendFailIfNoSpaceExplicitySet;
    private boolean sendFailIfNoSpace;
    private boolean sendFailIfNoSpaceAfterTimeoutExplicitySet;
    private long sendFailIfNoSpaceAfterTimeout = 0;

    private final List<SystemUsage> children = new CopyOnWriteArrayList();

    public SystemUsage() {
        this("default", null, null);
    }

    public SystemUsage(String name, PersistenceAdapter adapter, PListStore tempStore) {
        this.parent = null;
        this.name = name;
        this.memoryUsage = new MemoryUsage(name + ":memory");
        this.storeUsage = new StoreUsage(name + ":store", adapter);
        this.tempUsage = new TempUsage(name + ":temp", tempStore);
        this.memoryUsage.setExecutor(getExecutor());
        this.storeUsage.setExecutor(getExecutor());
        this.tempUsage.setExecutor(getExecutor());
    }

    public SystemUsage(SystemUsage parent, String name) {
        this.parent = parent;
        this.executor = parent.getExecutor();
        this.name = name;
        this.memoryUsage = new MemoryUsage(parent.memoryUsage, name + ":memory");
        this.storeUsage = new StoreUsage(parent.storeUsage, name + ":store");
        this.tempUsage = new TempUsage(parent.tempUsage, name + ":temp");
        this.memoryUsage.setExecutor(getExecutor());
        this.storeUsage.setExecutor(getExecutor());
        this.tempUsage.setExecutor(getExecutor());
    }

    public String getName() {
        return name;
    }

    /**
     * @return the memoryUsage
     */
    public MemoryUsage getMemoryUsage() {
        return this.memoryUsage;
    }

    /**
     * @return the storeUsage
     */
    public StoreUsage getStoreUsage() {
        return this.storeUsage;
    }

    /**
     * @return the tempDiskUsage
     */
    public TempUsage getTempUsage() {
        return this.tempUsage;
    }

    @Override
    public String toString() {
        return "UsageManager(" + getName() + ")";
    }

    public void start() {
        if (parent != null) {
            parent.addChild(this);
        }
        this.memoryUsage.start();
        this.storeUsage.start();
        this.tempUsage.start();
    }

    public void stop() {
        if (parent != null) {
            parent.removeChild(this);
        }
        this.memoryUsage.stop();
        this.storeUsage.stop();
        this.tempUsage.stop();
    }

    /**
     * Sets whether or not a send() should fail if there is no space free. The
     * default value is false which means to block the send() method until space
     * becomes available
     */
    public void setSendFailIfNoSpace(boolean failProducerIfNoSpace) {
        sendFailIfNoSpaceExplicitySet = true;
        this.sendFailIfNoSpace = failProducerIfNoSpace;
    }

    public boolean isSendFailIfNoSpace() {
        if (sendFailIfNoSpaceExplicitySet || parent == null) {
            return sendFailIfNoSpace;
        } else {
            return parent.isSendFailIfNoSpace();
        }
    }

    private void addChild(SystemUsage child) {
        children.add(child);
    }

    private void removeChild(SystemUsage child) {
        children.remove(child);
    }

    public SystemUsage getParent() {
        return parent;
    }

    public void setParent(SystemUsage parent) {
        this.parent = parent;
    }

    public boolean isSendFailIfNoSpaceExplicitySet() {
        return sendFailIfNoSpaceExplicitySet;
    }

    public void setSendFailIfNoSpaceExplicitySet(boolean sendFailIfNoSpaceExplicitySet) {
        this.sendFailIfNoSpaceExplicitySet = sendFailIfNoSpaceExplicitySet;
    }

    public long getSendFailIfNoSpaceAfterTimeout() {
        if (sendFailIfNoSpaceAfterTimeoutExplicitySet || parent == null) {
            return sendFailIfNoSpaceAfterTimeout;
        } else {
            return parent.getSendFailIfNoSpaceAfterTimeout();
        }
    }

    public void setSendFailIfNoSpaceAfterTimeout(long sendFailIfNoSpaceAfterTimeout) {
        this.sendFailIfNoSpaceAfterTimeoutExplicitySet = true;
        this.sendFailIfNoSpaceAfterTimeout = sendFailIfNoSpaceAfterTimeout;
    }

    public void setName(String name) {
        this.name = name;
        this.memoryUsage.setName(name + ":memory");
        this.storeUsage.setName(name + ":store");
        this.tempUsage.setName(name + ":temp");
    }

    public void setMemoryUsage(MemoryUsage memoryUsage) {
        if (memoryUsage.getName() == null) {
            memoryUsage.setName(this.memoryUsage.getName());
        }
        if (parent != null) {
            memoryUsage.setParent(parent.memoryUsage);
        }
        this.memoryUsage = memoryUsage;
        this.memoryUsage.setExecutor(getExecutor());
    }

    public void setStoreUsage(StoreUsage storeUsage) {
        if (storeUsage.getStore() == null) {
            storeUsage.setStore(this.storeUsage.getStore());
        }
        if (storeUsage.getName() == null) {
            storeUsage.setName(this.storeUsage.getName());
        }
        if (parent != null) {
            storeUsage.setParent(parent.storeUsage);
        }
        this.storeUsage = storeUsage;
        this.storeUsage.setExecutor(executor);

    }

    public void setTempUsage(TempUsage tempDiskUsage) {
        if (tempDiskUsage.getStore() == null) {
            tempDiskUsage.setStore(this.tempUsage.getStore());
        }
        if (tempDiskUsage.getName() == null) {
            tempDiskUsage.setName(this.tempUsage.getName());
        }
        if (parent != null) {
            tempDiskUsage.setParent(parent.tempUsage);
        }
        this.tempUsage = tempDiskUsage;
        this.tempUsage.setExecutor(getExecutor());
    }

    /**
     * @return the executor
     */
    public ThreadPoolExecutor getExecutor() {
        return this.executor;
    }

    /**
     * @param executor
     *            the executor to set
     */
    public void setExecutor(ThreadPoolExecutor executor) {
        this.executor = executor;
        if (this.memoryUsage != null) {
            this.memoryUsage.setExecutor(this.executor);
        }
        if (this.storeUsage != null) {
            this.storeUsage.setExecutor(this.executor);
        }
        if (this.tempUsage != null) {
            this.tempUsage.setExecutor(this.executor);
        }
    }
}

Other ActiveMQ examples (source code examples)

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

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