/*
 *Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *WSO2 Inc. 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.wso2.carbon.esb.mediator.test.throttle;

import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import org.wso2.carbon.esb.mediator.test.throttle.utils.ConcurrencyThrottleTestClient;
import org.wso2.carbon.esb.mediator.test.throttle.utils.ThrottleTestCounter;
import org.wso2.esb.integration.common.utils.ESBIntegrationTest;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.List;

import static org.testng.Assert.assertEquals;

public class ConcurrencyThrottlingTestCase extends ESBIntegrationTest {

    private final int CONCURRENT_CLIENTS = 7;
    private final int AS_POLICY_ACCESS_GRANTED = 4;
    private final int AS_POLICY_ACCESS_DENIED = 3;
    private List list;
    private ConcurrencyThrottleTestClient[] concurrencyThrottleTestClients;
    private Thread[] clients;
    private ThrottleTestCounter clientsDone;
    private int grantedRequests;
    private int deniedRequests;

    @BeforeClass(alwaysRun = true)
    public void setEnvironment() throws Exception {

        super.init();
        verifyProxyServiceExistence("throttlingMxConcurrentAccessTestProxy");
        list = Collections.synchronizedList(new ArrayList());
        concurrencyThrottleTestClients = new ConcurrencyThrottleTestClient[CONCURRENT_CLIENTS];
        clients = new Thread[CONCURRENT_CLIENTS];
        clientsDone = new ThrottleTestCounter();
        grantedRequests = 0;
        deniedRequests = 0;
        initClients();         //initialising Axis2Clients
    }

    @Test(groups = "wso2.esb", description = "Concurrency throttling - limit the number of concurrent requests", timeOut =
            1000 * 60 * 2)
    public void testPolicy() throws InterruptedException {
        startClients();
        while (clientsDone.getCount() < CONCURRENT_CLIENTS) {
            Thread.sleep(1000);
        }

        for (Object aList : list) {
            if (aList.toString().equals("Access Granted")) {
                grantedRequests++;
            } else if (aList.toString().equals("Access Denied")) {
                deniedRequests++;
            }
        }

        assertEquals(grantedRequests, AS_POLICY_ACCESS_GRANTED,
                "MaximumConcurrentAccess: Concurrent throttle policy failure");
        assertEquals(deniedRequests, AS_POLICY_ACCESS_DENIED, "Fault: Concurrent throttle policy failure");

    }

    @AfterClass(alwaysRun = true)
    public void destroy() throws Exception {
        concurrencyThrottleTestClients = null;
        clients = null;
        clientsDone = null;
        list = null;
        super.cleanup();
    }

    private void initClients() {
        for (int i = 0; i < CONCURRENT_CLIENTS; i++) {
            concurrencyThrottleTestClients[i] = new ConcurrencyThrottleTestClient(
                    getProxyServiceURLHttp("throttlingMxConcurrentAccessTestProxy"), list, clientsDone);
        }
        for (int i = 0; i < CONCURRENT_CLIENTS; i++) {
            clients[i] = new Thread(concurrencyThrottleTestClients[i]);
        }
    }

    private void startClients() {
        for (int i = 0; i < CONCURRENT_CLIENTS; i++) {
            clients[i].start();
        }
        int aliveCount = 0;
        Calendar startTime = Calendar.getInstance();
        while (aliveCount < CONCURRENT_CLIENTS) {
            if ((Calendar.getInstance().getTimeInMillis() - startTime.getTimeInMillis()) > 60000) {
                break;
            }
            if (clients[aliveCount].isAlive()) {
                aliveCount = 0;
                continue;
            }
            aliveCount++;
        }
    }

}
