/**
 * 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.
 */
package org.apache.camel.component.netty4;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.apache.camel.CamelContext;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.builder.RouteBuilder;
import org.junit.Ignore;
import org.junit.Test;

/**
 * @version 
 */
@Ignore("This test can cause CI servers to hang")
public class Netty2978IssueTest extends BaseNettyTest {

    @Test
    public void testNetty2978() throws Exception {
        CamelClient client = new CamelClient(context);
        try {
            for (int i = 0; i < 1000; i++) {
                Object reply = client.lookup(i);
                assertEquals("Bye " + i, reply);
            }
        } finally {
            client.close();
        }
    }

    @Test
    public void testNetty2978Concurrent() throws Exception {
        final CamelClient client = new CamelClient(context);
        try {
            final List<Callable<String>> callables = new ArrayList<>();
            for (int count = 0; count < 1000; count++) {
                final int i = count;
                callables.add(new Callable<String>() {
                    public String call() {
                        return client.lookup(i);
                    }
                });
            }

            final ExecutorService executorService = Executors.newFixedThreadPool(10);
            final List<Future<String>> results = executorService.invokeAll(callables);
            final Set<String> replies = new HashSet<>();
            for (Future<String> future : results) {
                // wait at most 60 sec to not hang test
                String reply = future.get(60, TimeUnit.SECONDS);
                assertTrue(reply.startsWith("Bye "));
                replies.add(reply);
            }

            // should be 1000 unique replies
            assertEquals(1000, replies.size());
            executorService.shutdownNow();
        } finally {
            client.close();
        }
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("netty4:tcp://localhost:{{port}}?sync=true")
                        .process(new Processor() {
                            public void process(final Exchange exchange) {
                                String body = exchange.getIn().getBody(String.class);
                                exchange.getOut().setBody("Bye " + body);
                            }
                        });
            }
        };
    }

    private static final class CamelClient {
        private final Endpoint endpoint;
        private final ProducerTemplate producerTemplate;

        CamelClient(CamelContext camelContext) {
            this.endpoint = camelContext.getEndpoint("netty4:tcp://localhost:{{port}}?sync=true");
            this.producerTemplate = camelContext.createProducerTemplate();
        }

        public void close() throws Exception {
            producerTemplate.stop();
        }

        public String lookup(int num) {
            return producerTemplate.requestBody(endpoint, num, String.class);
        }
    }

}
