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ActiveMQ example source code file (StoreUsage.java)

This example ActiveMQ source code file (StoreUsage.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

interruptedexception, override, override, persistenceadapter, persistenceadapter, storeusage, storeusage, string, usage, usage

The ActiveMQ StoreUsage.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 org.apache.activemq.store.PersistenceAdapter;

/**
 * Used to keep track of how much of something is being used so that a
 * productive working set usage can be controlled. Main use case is manage
 * memory usage.
 * 
 * @org.apache.xbean.XBean
 * 
 */
public class StoreUsage extends Usage<StoreUsage> {

    private PersistenceAdapter store;

    public StoreUsage() {
        super(null, null, 1.0f);
    }

    public StoreUsage(String name, PersistenceAdapter store) {
        super(null, name, 1.0f);
        this.store = store;
    }

    public StoreUsage(StoreUsage parent, String name) {
        super(parent, name, 1.0f);
        this.store = parent.store;
    }

    protected long retrieveUsage() {
        if (store == null)
            return 0;
        return store.size();
    }

    public PersistenceAdapter getStore() {
        return store;
    }

    public void setStore(PersistenceAdapter store) {
        this.store = store;
        onLimitChange();
    }

    @Override
    public int getPercentUsage() {
        synchronized (usageMutex) {
            percentUsage = caclPercentUsage();
            return super.getPercentUsage();
        }
    }

    @Override
    public boolean waitForSpace(long timeout, int highWaterMark) throws InterruptedException {
        if (parent != null) {
            if (parent.waitForSpace(timeout, highWaterMark)) {
                return true;
            }
        }

        return super.waitForSpace(timeout, highWaterMark);
    }
}

Other ActiveMQ examples (source code examples)

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

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