/*
 * 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.geode.cache;

import static org.apache.geode.distributed.ConfigurationProperties.LOCATORS;
import static org.apache.geode.distributed.ConfigurationProperties.MCAST_PORT;
import static org.apache.geode.internal.AvailablePortHelper.getRandomAvailableTCPPort;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import java.io.IOException;
import java.util.Properties;

import org.junit.Test;
import org.junit.experimental.categories.Category;

import org.apache.geode.cache.client.PoolFactory;
import org.apache.geode.cache.client.PoolManager;
import org.apache.geode.cache.server.CacheServer;
import org.apache.geode.cache.util.CacheWriterAdapter;
import org.apache.geode.test.dunit.Host;
import org.apache.geode.test.dunit.NetworkUtils;
import org.apache.geode.test.dunit.SerializableCallable;
import org.apache.geode.test.dunit.SerializableRunnable;
import org.apache.geode.test.dunit.VM;
import org.apache.geode.test.dunit.cache.internal.JUnit4CacheTestCase;
import org.apache.geode.test.junit.categories.ClientServerTest;

/**
 * This tests cases where we have both a connection pool and a bridge loader.
 */
@Category({ClientServerTest.class})
public class ConnectionPoolAndLoaderDUnitTest extends JUnit4CacheTestCase {

  private static int bridgeServerPort;
  private boolean useLocator;

  @Override
  public final void preTearDownCacheTestCase() {
    disconnectAllFromDS();
  }

  /**
   * Tests that we can have both a connection pool and a bridge loader. The expected order of
   * operations for get is. get from server load from loader.
   *
   * Anything that is loaded on the client is put on the server..
   */
  @Test
  public void testPoolAndLoader() throws Exception {
    final String regionName = getName();
    final Host host = Host.getHost(0);
    VM server = host.getVM(0);
    VM client = host.getVM(1);

    final int serverPort = getRandomAvailableTCPPort();
    server.invoke(new SerializableCallable() {
      @Override
      public Object call() throws IOException {
        Cache cache = getCache();
        AttributesFactory af = new AttributesFactory();
        RegionAttributes attrs = af.create();
        cache.createRegion(regionName, attrs);

        startBridgeServer(serverPort, true);
        return null;
      }
    });

    client.invoke(new SerializableCallable() {
      @Override
      public Object call() {
        Cache cache = getCache();
        PoolFactory factory = PoolManager.createFactory();
        factory.addServer(NetworkUtils.getServerHostName(host), serverPort);
        factory.create("pool1");

        AttributesFactory af = new AttributesFactory();
        af.setDataPolicy(DataPolicy.DEFAULT);
        af.setScope(Scope.LOCAL);
        af.setPoolName("pool1");
        af.setCacheLoader(new MyCacheLoader("loaded"));
        RegionAttributes attrs = af.create();
        cache.createRegion(regionName, attrs);

        return null;
      }
    });

    client.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        region.put("a", "put-a");
        region.put("b", "put-b");
        assertEquals("loaded-c", region.get("c"));
        assertEquals("loaded-d", region.get("d"));
      }
    });

    server.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        assertEquals("put-a", region.get("a"));
        assertEquals("put-b", region.get("b"));
        assertEquals("loaded-c", region.get("c"));
        assertEquals("loaded-d", region.get("d"));
        region.put("e", "server-e");
      }
    });

    client.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        assertEquals("put-a", region.get("a"));
        assertEquals("put-b", region.get("b"));
        assertEquals("loaded-c", region.get("c"));
        assertEquals("loaded-d", region.get("d"));
        assertEquals("server-e", region.get("e"));
      }
    });
  }

  /**
   * Test the we can have both a connection pool and a cache writer.
   *
   * The expected order of operations for put is: local writer put on server
   */
  @Test
  public void testPoolAndWriter() throws Exception {
    final String regionName = getName();
    final Host host = Host.getHost(0);
    VM server = host.getVM(0);
    VM client = host.getVM(1);

    final int serverPort = getRandomAvailableTCPPort();
    server.invoke(new SerializableCallable() {
      @Override
      public Object call() throws IOException {
        Cache cache = getCache();
        AttributesFactory af = new AttributesFactory();
        RegionAttributes attrs = af.create();
        cache.createRegion(regionName, attrs);

        startBridgeServer(serverPort, true);
        return null;
      }
    });

    client.invoke(new SerializableCallable() {
      @Override
      public Object call() {
        Cache cache = getCache();
        PoolFactory factory = PoolManager.createFactory();
        factory.addServer(NetworkUtils.getServerHostName(host), serverPort);
        factory.create("pool1");

        AttributesFactory af = new AttributesFactory();
        af.setDataPolicy(DataPolicy.DEFAULT);
        af.setScope(Scope.LOCAL);
        af.setPoolName("pool1");
        af.setCacheWriter(new MyCacheWriter());
        RegionAttributes attrs = af.create();
        cache.createRegion(regionName, attrs);

        return null;
      }
    });

    client.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        MyCacheWriter writer = (MyCacheWriter) region.getAttributes().getCacheWriter();
        region.put("a", "a");
        region.put("b", "b");
        region.put("c", "c");
        region.destroy("c");
        writer.throwException = true;
        try {
          region.put("a", "new-a");
          fail("Should have gotten a cache writer exception");
        } catch (CacheWriterException e) {
          assertEquals("beforeUpdate", e.getMessage());
        }
        try {
          region.destroy("b");
          fail("Should have gotten a cache writer exception");
        } catch (CacheWriterException e) {
          assertEquals("beforeDestroy", e.getMessage());
        }
        try {
          region.put("d", "d");
          fail("Should have gotten a cache writer exception");
        } catch (CacheWriterException e) {
          assertEquals("beforeCreate", e.getMessage());
        }
        try {
          region.clear();
          fail("Should have gotten a cache writer exception");
        } catch (CacheWriterException e) {
          assertEquals("beforeRegionClear", e.getMessage());
        }
        try {
          region.destroyRegion();
          fail("Should have gotten a cache writer exception");
        } catch (CacheWriterException e) {
          assertEquals("beforeRegionDestroy", e.getMessage());
        }
      }
    });

    server.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        assertEquals("a", region.get("a"));
        assertEquals("b", region.get("b"));
        assertEquals(null, region.get("c"));
        assertEquals(null, region.get("d"));
      }
    });
  }

  /**
   * Test that we can have a peer, a server, and a bridge loader for the same region.
   *
   * Expected order 1 localCache 2 peer 3 server 4 loader
   */
  @Test
  public void testPoolLoadAndPeer() throws Exception {
    final String regionName = getName();
    final Host host = Host.getHost(0);
    VM server = host.getVM(0);
    VM client1 = host.getVM(1);
    VM client2 = host.getVM(2);

    final int serverPort = getRandomAvailableTCPPort();
    server.invoke(new SerializableCallable() {
      @Override
      public Object call() throws IOException {
        Cache cache = getCache();
        AttributesFactory af = new AttributesFactory();
        RegionAttributes attrs = af.create();

        cache.createRegion(regionName, attrs);

        startBridgeServer(serverPort, true);
        return null;
      }
    });

    SerializableCallable createClient1 = new SerializableCallable() {
      @Override
      public Object call() {
        // Make sure we get a distributed system that has the locator
        useLocator = true;
        Cache cache = getCache();
        useLocator = false;
        PoolFactory factory = PoolManager.createFactory();
        factory.addServer(NetworkUtils.getServerHostName(host), serverPort);
        factory.create("pool1");
        AttributesFactory af = new AttributesFactory();
        af.setDataPolicy(DataPolicy.NORMAL);
        af.setScope(Scope.DISTRIBUTED_ACK);
        af.setPoolName("pool1");
        af.setCacheLoader(new MyCacheLoader("loaded1"));
        RegionAttributes attrs = af.create();
        cache.createRegion(regionName, attrs);
        return null;
      }
    };
    client1.invoke(createClient1);

    SerializableCallable createClient2 = new SerializableCallable() {
      @Override
      public Object call() {
        // Make sure we get a distributed system that has the locator
        useLocator = true;
        Cache cache = getCache();
        useLocator = false;
        PoolFactory factory = PoolManager.createFactory();
        factory.addServer(NetworkUtils.getServerHostName(host), serverPort);
        factory.create("pool1");
        AttributesFactory af = new AttributesFactory();
        af.setDataPolicy(DataPolicy.NORMAL);
        af.setScope(Scope.DISTRIBUTED_ACK);
        af.setCacheLoader(new MyCacheLoader("loaded2"));
        af.setPoolName("pool1");
        RegionAttributes attrs = af.create();
        cache.createRegion(regionName, attrs);
        return null;
      }
    };
    client2.invoke(createClient2);

    // We need to test what happens when
    // we do a load in client1 in each of these cases:
    // Case On Server On Client 1 On Client 2 Expected
    // a X server
    // b X X client1
    // c X X X client1
    // d X X client2
    // e X client1
    // f X X client1
    // g X client2 (loader does a netSearch)
    // h client1 loader

    // Setup scenarios
    client1.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        region.put("b", "client1-b");
        region.put("c", "client1-c");
        region.put("e", "client1-e");
        region.put("f", "client1-f");
      }
    });

    client2.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        assertEquals("client1-c", region.get("c"));
        region.put("d", "client2-d");
        assertEquals("client1-f", region.get("f"));
        region.put("g", "client2-g");
      }
    });

    server.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        region.put("a", "server-a");
        region.localDestroy("e");
        region.localDestroy("f");
        region.localDestroy("g");
      }
    });

    // Test the scenarios
    client1.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        assertEquals("server-a", region.get("a"));
        assertEquals("client1-b", region.get("b"));
        assertEquals("client1-c", region.get("c"));
        assertEquals("client2-d", region.get("d"));
        assertEquals("client1-e", region.get("e"));
        assertEquals("client1-f", region.get("f"));
        assertEquals("client2-g", region.get("g"));
        assertEquals("loaded1-h", region.get("h"));
      }
    });

    server.invoke(new SerializableRunnable() {
      @Override
      public void run() {
        Region region = getRootRegion(regionName);
        assertEquals("server-a", region.get("a"));
        assertEquals("client1-b", region.get("b"));
        assertEquals("client1-c", region.get("c"));
        assertEquals("client2-d", region.get("d"));
        assertEquals(null, region.get("e"));
        assertEquals(null, region.get("f"));

        // dsmith - This result seems somewhat suspect. client1 did a net load
        // which found a value in client2, but it never propagated that result
        // to the server. After talking with Darrel we decided to keep it this
        // way for now.
        assertEquals(null, region.get("g"));
        assertEquals("loaded1-h", region.get("h"));
      }
    });
  }

  private void startBridgeServer(int port, boolean notifyBySubscription) throws IOException {
    Cache cache = getCache();
    CacheServer bridge = cache.addCacheServer();
    bridge.setPort(port);
    bridge.setNotifyBySubscription(notifyBySubscription);
    bridge.start();
    bridgeServerPort = bridge.getPort();
  }

  @Override
  public Properties getDistributedSystemProperties() {
    Properties p = new Properties();
    if (!useLocator) {
      p.setProperty(LOCATORS, "");
      p.setProperty(MCAST_PORT, "0");
    }
    return p;
  }

  private static class MyCacheWriter extends CacheWriterAdapter {

    protected boolean throwException = false;

    @Override
    public void beforeCreate(EntryEvent event) throws CacheWriterException {
      if (throwException) {
        throw new CacheWriterException("beforeCreate");
      }
    }

    @Override
    public void beforeDestroy(EntryEvent event) throws CacheWriterException {
      if (throwException) {
        throw new CacheWriterException("beforeDestroy");
      }
    }

    @Override
    public void beforeRegionClear(RegionEvent event) throws CacheWriterException {
      if (throwException) {
        throw new CacheWriterException("beforeRegionClear");
      }
    }

    @Override
    public void beforeRegionDestroy(RegionEvent event) throws CacheWriterException {
      if (throwException) {
        throw new CacheWriterException("beforeRegionDestroy");
      }
    }

    @Override
    public void beforeUpdate(EntryEvent event) throws CacheWriterException {
      if (throwException) {
        throw new CacheWriterException("beforeUpdate");
      }
    }
  }

  private static class MyCacheLoader implements CacheLoader {

    private final String message;

    public MyCacheLoader(String message) {
      this.message = message;
    }

    @Override
    public Object load(LoaderHelper helper) throws CacheLoaderException {
      if (helper.getRegion().getAttributes().getScope().equals(Scope.DISTRIBUTED_ACK)) {
        System.err.println("Doing a net search for " + helper.getKey());
        Object result = helper.netSearch(false);
        System.err.println("Net search found " + result);
        if (result != null) {
          return result;
        }
      }

      Object key = helper.getKey();
      return message + "-" + key;
    }

    @Override
    public void close() {}
  }
}