org.springframework.data.redis.connection.lettuce.TestEventLoopGroupProvider.java Source code

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Here is the source code for org.springframework.data.redis.connection.lettuce.TestEventLoopGroupProvider.java

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/*
 * Copyright 2016 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.springframework.data.redis.connection.lettuce;

import java.util.concurrent.TimeUnit;

import com.lambdaworks.redis.resource.DefaultEventLoopGroupProvider;

import io.netty.util.concurrent.DefaultPromise;
import io.netty.util.concurrent.EventExecutorGroup;
import io.netty.util.concurrent.ImmediateEventExecutor;
import io.netty.util.concurrent.Promise;

/**
 * A {@link com.lambdaworks.redis.resource.EventLoopGroupProvider} suitable for testing. Preserves the event loop groups
 * between tests. Every time a new {@link TestEventLoopGroupProvider} instance is created, a
 * {@link Runtime#addShutdownHook(Thread) shutdown hook} is added to close the resources.
 * 
 * @author Mark Paluch
 * @author Christoph Strobl
 */
class TestEventLoopGroupProvider extends DefaultEventLoopGroupProvider {

    private static final int NUMBER_OF_THREADS = 10;

    public TestEventLoopGroupProvider() {

        super(NUMBER_OF_THREADS);

        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                try {
                    TestEventLoopGroupProvider.this.shutdown(0, 0, TimeUnit.MILLISECONDS).get(1, TimeUnit.SECONDS);
                } catch (Exception o_O) {
                    // ignored
                }
            }
        });
    }

    @Override
    public Promise<Boolean> release(EventExecutorGroup eventLoopGroup, long quietPeriod, long timeout,
            TimeUnit unit) {

        DefaultPromise<Boolean> result = new DefaultPromise<Boolean>(ImmediateEventExecutor.INSTANCE);
        result.setSuccess(true);

        return result;
    }
}