httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientConnectionEviction.java

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
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 * <http://www.apache.org/>.
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package org.apache.hc.client5.http.examples;

import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
import org.apache.hc.client5.http.async.methods.SimpleHttpRequests;
import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
import org.apache.hc.client5.http.async.methods.SimpleRequestProducer;
import org.apache.hc.client5.http.async.methods.SimpleResponseConsumer;
import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.util.TimeValue;
import org.apache.hc.core5.util.Timeout;

/**
 * Example demonstrating how to evict expired and idle connections
 * from the connection pool.
 */
public class AsyncClientConnectionEviction {

    public static void main(final String[] args) throws Exception {

        final IOReactorConfig ioReactorConfig = IOReactorConfig.custom()
                .setSoTimeout(Timeout.ofSeconds(5))
                .build();

        final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
                .setIOReactorConfig(ioReactorConfig)
                .evictExpiredConnections()
                .evictIdleConnections(TimeValue.ofSeconds(10))
                .build();

        client.start();

        final HttpHost target = new HttpHost("httpbin.org");

        final SimpleHttpRequest request = SimpleHttpRequests.GET.create(target, "/");
        final Future<SimpleHttpResponse> future1 = client.execute(
                SimpleRequestProducer.create(request),
                SimpleResponseConsumer.create(),
                new FutureCallback<SimpleHttpResponse>() {

                    @Override
                    public void completed(final SimpleHttpResponse response) {
                        System.out.println(request.getRequestUri() + "->" + response.getCode());
                        System.out.println(response.getBody());
                    }

                    @Override
                    public void failed(final Exception ex) {
                        System.out.println(request.getRequestUri() + "->" + ex);
                    }

                    @Override
                    public void cancelled() {
                        System.out.println(request.getRequestUri() + " cancelled");
                    }

                });

        future1.get();

        Thread.sleep(TimeUnit.SECONDS.toMillis(30));

        // Previous connection should get evicted from the pool by now

        final Future<SimpleHttpResponse> future2 = client.execute(
                SimpleRequestProducer.create(request),
                SimpleResponseConsumer.create(),
                new FutureCallback<SimpleHttpResponse>() {

                    @Override
                    public void completed(final SimpleHttpResponse response) {
                        System.out.println(request.getRequestUri() + "->" + response.getCode());
                        System.out.println(response.getBody());
                    }

                    @Override
                    public void failed(final Exception ex) {
                        System.out.println(request.getRequestUri() + "->" + ex);
                    }

                    @Override
                    public void cancelled() {
                        System.out.println(request.getRequestUri() + " cancelled");
                    }

                });

        future2.get();

        System.out.println("Shutting down");
        client.close(CloseMode.GRACEFUL);
    }

}