com.spotify.helios.agent.Result.java Source code

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Here is the source code for com.spotify.helios.agent.Result.java

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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * 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.spotify.helios.agent;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

import javax.annotation.Nullable;

/**
 * Helper for getting the result of a {@link ListenableFuture}.
 */
public class Result<V> implements FutureCallback<V> {

    private volatile boolean done;
    private volatile V result;
    private volatile Throwable exception;

    public Result(final ListenableFuture<V> future) {
        Futures.addCallback(future, this);
    }

    @Override
    public void onSuccess(@Nullable final V r) {
        done = true;
        result = r;
    }

    @Override
    public void onFailure(final Throwable t) {
        done = true;
        exception = t;
    }

    public boolean isDone() {
        return done;
    }

    public boolean isSuccess() {
        return isDone() && result != null;
    }

    public boolean isFailure() {
        return isDone() && exception != null;
    }

    public V getResult() {
        return result;
    }

    public Throwable getException() {
        return exception;
    }

    public static <V> Result<V> of(final ListenableFuture<V> future) {
        return new Result<>(future);
    }
}