AsynchronousTask.java

/**
 * Copyright (C) 2009-2015 Dell, Inc.
 * See annotations for authorship information
 *
 * ====================================================================
 * 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 org.dasein.cloud;

import javax.annotation.Nonnegative;
import javax.annotation.Nullable;

public class AsynchronousTask<T> {
    private double    percentComplete;
    private long      endTime;
    private T         result;
    private long      startTime;
    private Throwable taskError;

    public AsynchronousTask() {
        startTime = System.currentTimeMillis();
        endTime = -1L;
    }

    public synchronized void complete( @Nullable Throwable withError ) {
        taskError = withError;
        endTime = System.currentTimeMillis();
        notifyAll();
    }

    public synchronized void completeWithResult( @Nullable T result ) {
        this.result = result;
        endTime = System.currentTimeMillis();
        notifyAll();
    }

    public synchronized boolean isComplete() {
        return endTime > -1L;
    }

    public synchronized long getDuration() {
        if( endTime == -1L ) {
            return System.currentTimeMillis() - startTime;
        }
        else {
            return endTime - startTime;
        }
    }

    public synchronized @Nonnegative double getPercentComplete() {
        return percentComplete;
    }

    public synchronized void setPercentComplete( @Nonnegative double percentComplete ) {
        this.percentComplete = percentComplete;
        notifyAll();
    }

    public synchronized @Nonnegative long getEndTime() {
        return endTime;
    }

    public @Nullable T getResult() {
        return result;
    }

    public @Nonnegative long getStartTime() {
        return startTime;
    }

    public void setStartTime( @Nonnegative long startTime ) {
        this.startTime = startTime;
    }

    public @Nullable Throwable getTaskError() {
        return taskError;
    }
}