org.glowroot.central.EventLoopGroups.java Source code

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Here is the source code for org.glowroot.central.EventLoopGroups.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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.glowroot.central;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;

import static java.util.concurrent.TimeUnit.SECONDS;

class EventLoopGroups {

    private EventLoopGroups() {
    }

    // copy of io.grpc.netty.Utils.DefaultEventLoopGroupResource with some modification
    static EventLoopGroup create(String name) {
        ThreadFactory threadFactory = new ThreadFactoryBuilder().setDaemon(true).setNameFormat(name + "-%d")
                .build();
        final ExecutorService executor = Executors.newSingleThreadExecutor(threadFactory);
        NioEventLoopGroup nioEventLoopGroup = new NioEventLoopGroup(1, executor);
        nioEventLoopGroup.terminationFuture().addListener(new GenericFutureListener<Future<Object>>() {
            @Override
            public void operationComplete(Future<Object> future) throws Exception {
                executor.shutdown();
                if (!executor.awaitTermination(10, SECONDS)) {
                    throw new IllegalStateException("Could not terminate executor");
                }
            }
        });
        return nioEventLoopGroup;
    }
}