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A library of utilities, helpers and higher-level APIs for the Kafka client library

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/*
 * Copyright 2019 EPAM Systems
 *
 * 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.eco.commons.kafka.consumer.bootstrap;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Consumer;

import org.apache.commons.lang3.Validate;

/**
 * @author Andrei_Tytsik
 */
class BootstrapConsumerThread extends Thread {

    private final static long SHUTDOWN_TIMEOUT_SECONDS = 30;

    private final BootstrapConsumer consumer;
    private final Consumer handler;

    private final CountDownLatch bootstrapLatch = new CountDownLatch(1);

    private final AtomicBoolean running = new AtomicBoolean(true);
    private final CountDownLatch shutdownLatch = new CountDownLatch(1);

    public BootstrapConsumerThread(BootstrapConsumer consumer, Consumer handler) {
        Validate.notNull(consumer, "Bootstrap Consumer is null");
        Validate.notNull(handler, "Handler is null");

        this.consumer = consumer;
        this.handler = handler;
    }

    @Override
    public void run() {
        try {
            while (running.get()) {
                handler.accept(consumer.fetch());
                bootstrapLatch.countDown();
            }
        } finally {
            running.set(false);
            shutdownLatch.countDown();
        }
    }

    public void shutdown() throws InterruptedException {
        shutdown(SHUTDOWN_TIMEOUT_SECONDS, TimeUnit.SECONDS);
    }

    public void shutdown(long timeout, TimeUnit timeUnit) throws InterruptedException {
        if (running.compareAndSet(true, false)) {
            consumer.wakeup();
            shutdownLatch.await(timeout, timeUnit);
            consumer.close();
        }
    }

    public void waitForBootstrap() throws InterruptedException {
        bootstrapLatch.await(
                (long)(consumer.getBootstrapTimeoutInMs() * 1.5), TimeUnit.MILLISECONDS);
    }

    public void waitForBootstrap(long timeout, TimeUnit timeUnit) throws InterruptedException {
        bootstrapLatch.await(timeout, timeUnit);
    }

}