io.fabric8.gateway.handlers.detecting.FutureHandler Maven / Gradle / Ivy

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/**
 * Copyright (C) FuseSource, Inc.
 * http://fusesource.com
 *
 * 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 io.fabric8.gateway.handlers.detecting;

import org.vertx.java.core.AsyncResult;
import org.vertx.java.core.Handler;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * Implements a Vertx handler which you can await() future results from.
 */
public class FutureHandler implements Handler {
    CountDownLatch done = new CountDownLatch(1);
    T event;

    @Override
    public void handle(T event) {
        this.event = event;
        done.countDown();
    }

    T await() throws InterruptedException {
        done.await();
        return event;
    }

    T await(long timeout, TimeUnit unit) throws InterruptedException {
        if( done.await(timeout, unit) ) {
            return event;
        } else {
            return null;
        }
    }


    public static  T result(FutureHandler> future) throws Exception {
        AsyncResult asyncResult = future.await();
        if( asyncResult.failed() ) {
            throw new Exception(asyncResult.cause());
        } else {
            return asyncResult.result();
        }
    }
}