com.epam.deltix.util.concurrent.AlwaysAvailableDataSource Maven / Gradle / Ivy

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/*
 * Copyright 2021 EPAM Systems, Inc
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. Licensed 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 com.epam.deltix.util.concurrent;

/**
 *  An implementation of AsynchronousDataSource, which always has the data available.
 *  Convenient base class for implementing "always ready" AsynchronousDataSource instances.
 */
public class AlwaysAvailableDataSource implements AsynchronousDataSource {
    /**
     *  Immediately returns true.
     */
    public boolean                      isDataAvailable (long timeout)
        throws InterruptedException
    {
        return (true);
    }
    
    /**
     *  Immediately returns true.
     */
    public boolean                      isDataAvailable () {
        return (true);
    }    

    /**
     *  Does nothing.
     */
    public void                         removeAvailabilityListener (Runnable listener) {
    }

    /**
     *  Does nothing.
     */
    public void                         addAvailabilityListener (Runnable listener) {
    }       
}