/*
 * 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.thrift;

import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import com.googlecode.junittoolbox.MultithreadingTester;
import com.googlecode.junittoolbox.RunnableAssert;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.thrift.generated.Calculator;
import org.apache.camel.component.thrift.generated.Operation;
import org.apache.camel.component.thrift.generated.Work;
import org.apache.camel.test.AvailablePortFinder;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.apache.thrift.TException;
import org.apache.thrift.async.AsyncMethodCallback;
import org.apache.thrift.async.TAsyncClientManager;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TNonblockingSocket;
import org.apache.thrift.transport.TNonblockingTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ThriftConsumerConcurrentTest extends CamelTestSupport {
    private static final Logger LOG = LoggerFactory.getLogger(ThriftConsumerConcurrentTest.class);

    private static final int THRIFT_SYNC_REQUEST_TEST_PORT = AvailablePortFinder.getNextAvailable();
    private static final int THRIFT_ASYNC_REQUEST_TEST_PORT = AvailablePortFinder.getNextAvailable();
    private static final int THRIFT_TEST_NUM1 = 12;
    private static final int CONCURRENT_THREAD_COUNT = 30;
    private static final int ROUNDS_PER_THREAD_COUNT = 10;
    
    private static AtomicInteger idCounter = new AtomicInteger();

    public static Integer createId() {
        return idCounter.getAndIncrement();
    }

    public static Integer getId() {
        return idCounter.get();
    }

    @Test
    public void testSyncWithConcurrentThreads() throws Exception {
        RunnableAssert ra = new RunnableAssert("testSyncWithConcurrentThreads") {

            @Override
            public void run() throws TTransportException {
                TTransport transport = new TSocket("localhost", THRIFT_SYNC_REQUEST_TEST_PORT);
                transport.open();
                TProtocol protocol = new TBinaryProtocol(new TFramedTransport(transport));
                Calculator.Client client = (new Calculator.Client.Factory()).getClient(protocol);

                int instanceId = createId();

                int calculateResponse = 0;
                try {
                    calculateResponse = client.calculate(1, new Work(instanceId, THRIFT_TEST_NUM1, Operation.MULTIPLY));
                } catch (TException e) {
                    LOG.info("Exception", e);
                }
                
                assertNotNull("instanceId = " + instanceId, calculateResponse);
                assertEquals(instanceId * THRIFT_TEST_NUM1, calculateResponse);

                transport.close();
            }
        };

        new MultithreadingTester().add(ra).numThreads(CONCURRENT_THREAD_COUNT).numRoundsPerThread(ROUNDS_PER_THREAD_COUNT).run();
    }
    
    @Test
    public void testAsyncWithConcurrentThreads() throws Exception {
        RunnableAssert ra = new RunnableAssert("testAsyncWithConcurrentThreads") {

            @Override
            public void run() throws TTransportException, IOException, InterruptedException {
                final CountDownLatch latch = new CountDownLatch(1);
                
                TNonblockingTransport transport = new TNonblockingSocket("localhost", THRIFT_ASYNC_REQUEST_TEST_PORT);
                Calculator.AsyncClient client = (new Calculator.AsyncClient.Factory(new TAsyncClientManager(), new TBinaryProtocol.Factory())).getAsyncClient(transport);

                int instanceId = createId();
                CalculateAsyncMethodCallback calculateCallback = new CalculateAsyncMethodCallback(latch);
                try {
                    client.calculate(1, new Work(instanceId, THRIFT_TEST_NUM1, Operation.MULTIPLY), calculateCallback);
                } catch (TException e) {
                    LOG.info("Exception", e);
                }
                latch.await(5, TimeUnit.SECONDS);
                
                int calculateResponse = calculateCallback.getCalculateResponse();
                assertNotNull("instanceId = " + instanceId, calculateResponse);
                assertEquals(instanceId * THRIFT_TEST_NUM1, calculateResponse);

                transport.close();
            }
        };

        new MultithreadingTester().add(ra).numThreads(CONCURRENT_THREAD_COUNT).numRoundsPerThread(ROUNDS_PER_THREAD_COUNT).run();
    }
    
    public class CalculateAsyncMethodCallback implements AsyncMethodCallback<Integer> {
        private final CountDownLatch latch;
        private Integer calculateResponse;
        
        public CalculateAsyncMethodCallback(CountDownLatch latch) {
            this.latch = latch;
        }
        
        @Override
        public void onComplete(Integer response) {
            calculateResponse = response;
            latch.countDown();
        }

        @Override
        public void onError(Exception exception) {
            LOG.info("Exception", exception);
            latch.countDown();
        }
        
        public Integer getCalculateResponse() {
            return calculateResponse;
        }
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() {
                
                from("thrift://localhost:" + THRIFT_SYNC_REQUEST_TEST_PORT + "/org.apache.camel.component.thrift.generated.Calculator?synchronous=true")
                    .setBody(simple("${body[1]}")).bean(new CalculatorMessageBuilder(), "multiply");
                
                
                from("thrift://localhost:" + THRIFT_ASYNC_REQUEST_TEST_PORT + "/org.apache.camel.component.thrift.generated.Calculator")
                    .setBody(simple("${body[1]}")).bean(new CalculatorMessageBuilder(), "multiply");
            }
        };
    }
    
    public class CalculatorMessageBuilder {
        public Integer multiply(Work work) {
            return work.num1 * work.num2;
        }
    }
}