/*
 * 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.
 */

// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable UnusedParameter.Global
// ReSharper disable UnusedAutoPropertyAccessor.Local
// ReSharper disable UnusedAutoPropertyAccessor.Global
#pragma warning disable 618
namespace Apache.Ignite.Core.Tests
{
    using System;
    using System.Collections.Concurrent;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading;
    using System.Threading.Tasks;
    using Apache.Ignite.Core.Cache.Configuration;
    using Apache.Ignite.Core.Cache.Query;
    using Apache.Ignite.Core.Cluster;
    using Apache.Ignite.Core.Common;
    using Apache.Ignite.Core.Events;
    using Apache.Ignite.Core.Impl;
    using Apache.Ignite.Core.Impl.Common;
    using Apache.Ignite.Core.Impl.Events;
    using Apache.Ignite.Core.Resource;
    using Apache.Ignite.Core.Tests.Compute;
    using NUnit.Framework;

    using ImplCompute = Core.Impl.Compute.Compute;

    /// <summary>
    /// <see cref="IEvents"/> tests.
    /// </summary>
    public class EventsTest
    {
        /** */
        public const string CacheName = "eventsTest";

        /** */
        private IIgnite _grid1;

        /** */
        private IIgnite _grid2;

        /** */
        private IIgnite _grid3;

        /** */
        private IIgnite[] _grids;

        /// <summary>
        /// Executes before each test.
        /// </summary>
        [SetUp]
        public void SetUp()
        {
            StartGrids();
            EventsTestHelper.ListenResult = true;
        }

        /// <summary>
        /// Executes after each test.
        /// </summary>
        [TearDown]
        public void TearDown()
        {
            try
            {
                TestUtils.AssertHandleRegistryIsEmpty(1000, _grid1, _grid2, _grid3);
            }
            catch (Exception)
            {
                // Restart grids to cleanup
                StopGrids();

                throw;
            }
            finally
            {
                EventsTestHelper.AssertFailures();

                if (TestContext.CurrentContext.Test.Name.StartsWith("TestEventTypes"))
                    StopGrids(); // clean events for other tests
            }
        }

        /// <summary>
        /// Fixture tear down.
        /// </summary>
        [TestFixtureTearDown]
        public void FixtureTearDown()
        {
            StopGrids();
        }

        /// <summary>
        /// Tests enable/disable of event types.
        /// </summary>
        [Test]
        public void TestEnableDisable()
        {
            var events = _grid1.GetEvents();

            Assert.AreEqual(0, events.GetEnabledEvents().Count);

            Assert.IsFalse(EventType.CacheAll.Any(events.IsEnabled));

            events.EnableLocal(EventType.CacheAll);

            Assert.AreEqual(EventType.CacheAll, events.GetEnabledEvents());

            Assert.IsTrue(EventType.CacheAll.All(events.IsEnabled));

            events.EnableLocal(EventType.TaskExecutionAll);

            events.DisableLocal(EventType.CacheAll);

            Assert.AreEqual(EventType.TaskExecutionAll, events.GetEnabledEvents());
        }

        /// <summary>
        /// Tests LocalListen.
        /// </summary>
        [Test]
        public void TestLocalListen()
        {
            var events = _grid1.GetEvents();
            var listener = EventsTestHelper.GetListener();
            var eventType = EventType.TaskExecutionAll;

            events.EnableLocal(eventType);

            events.LocalListen(listener, eventType);

            CheckSend(3);  // 3 events per task * 3 grids

            // Check unsubscription for specific event
            events.StopLocalListen(listener, EventType.TaskReduced);

            CheckSend(2);

            // Unsubscribe from all events
            events.StopLocalListen(listener, Enumerable.Empty<int>());

            CheckNoEvent();

            // Check unsubscription by filter
            events.LocalListen(listener, EventType.TaskReduced);

            CheckSend();

            EventsTestHelper.ListenResult = false;

            CheckSend();  // one last event will be received for each listener

            CheckNoEvent();
        }

        /// <summary>
        /// Tests LocalListen.
        /// </summary>
        [Test]
        [Ignore("IGNITE-879")]
        public void TestLocalListenRepeatedSubscription()
        {
            var events = _grid1.GetEvents();
            var listener = EventsTestHelper.GetListener();
            var eventType = EventType.TaskExecutionAll;

            events.EnableLocal(eventType);

            events.LocalListen(listener, eventType);

            CheckSend(3);  // 3 events per task * 3 grids

            events.LocalListen(listener, eventType);
            events.LocalListen(listener, eventType);

            CheckSend(9);

            events.StopLocalListen(listener, eventType);

            CheckSend(6);

            events.StopLocalListen(listener, eventType);

            CheckSend(3);

            events.StopLocalListen(listener, eventType);

            CheckNoEvent();
        }

        /// <summary>
        /// Tests all available event types/classes.
        /// </summary>
        [Test, TestCaseSource("TestCases")]
        public void TestEventTypes(EventTestCase testCase)
        {
            var events = _grid1.GetEvents();

            events.EnableLocal(testCase.EventType);

            var listener = EventsTestHelper.GetListener();

            events.LocalListen(listener, testCase.EventType);

            EventsTestHelper.ClearReceived(testCase.EventCount);

            testCase.GenerateEvent(_grid1);

            EventsTestHelper.VerifyReceive(testCase.EventCount, testCase.EventObjectType, testCase.EventType);

            if (testCase.VerifyEvents != null)
                testCase.VerifyEvents(EventsTestHelper.ReceivedEvents.Reverse(), _grid1);

            // Check stop
            events.StopLocalListen(listener);

            EventsTestHelper.ClearReceived(0);

            testCase.GenerateEvent(_grid1);

            Thread.Sleep(EventsTestHelper.Timeout);
        }

        /// <summary>
        /// Test cases for TestEventTypes: type id + type + event generator.
        /// </summary>
        public static IEnumerable<EventTestCase> TestCases
        {
            get
            {
                yield return new EventTestCase
                {
                    EventType = EventType.CacheAll,
                    EventObjectType = typeof (CacheEvent),
                    GenerateEvent = g => g.GetCache<int, int>(CacheName).Put(TestUtils.GetPrimaryKey(g, CacheName), 1),
                    VerifyEvents = (e, g) => VerifyCacheEvents(e, g),
                    EventCount = 3
                };

                yield return new EventTestCase
                {
                    EventType = EventType.TaskExecutionAll,
                    EventObjectType = typeof (TaskEvent),
                    GenerateEvent = g => GenerateTaskEvent(g),
                    VerifyEvents = (e, g) => VerifyTaskEvents(e),
                    EventCount = 3
                };

                yield return new EventTestCase
                {
                    EventType = EventType.JobExecutionAll,
                    EventObjectType = typeof (JobEvent),
                    GenerateEvent = g => GenerateTaskEvent(g),
                    EventCount = 7
                };

                yield return new EventTestCase
                {
                    EventType = new[] {EventType.CacheQueryExecuted},
                    EventObjectType = typeof (CacheQueryExecutedEvent),
                    GenerateEvent = g => GenerateCacheQueryEvent(g),
                    EventCount = 1
                };

                yield return new EventTestCase
                {
                    EventType = new[] { EventType.CacheQueryObjectRead },
                    EventObjectType = typeof (CacheQueryReadEvent),
                    GenerateEvent = g => GenerateCacheQueryEvent(g),
                    EventCount = 1
                };
            }
        }

        /// <summary>
        /// Tests the LocalQuery.
        /// </summary>
        [Test]
        public void TestLocalQuery()
        {
            var events = _grid1.GetEvents();

            var eventType = EventType.TaskExecutionAll;

            events.EnableLocal(eventType);

            var oldEvents = events.LocalQuery();

            GenerateTaskEvent();

            // "Except" works because of overridden equality
            var qryResult = events.LocalQuery(eventType).Except(oldEvents).ToList();

            Assert.AreEqual(3, qryResult.Count);
        }

        /// <summary>
        /// Tests the record local.
        /// </summary>
        [Test]
        public void TestRecordLocal()
        {
            Assert.Throws<NotSupportedException>(() => _grid1.GetEvents().RecordLocal(new MyEvent()));
        }

        /// <summary>
        /// Tests the WaitForLocal.
        /// </summary>
        [Test]
        public void TestWaitForLocal()
        {
            var events = _grid1.GetEvents();

            var timeout = TimeSpan.FromSeconds(3);

            var eventType = EventType.TaskExecutionAll;

            events.EnableLocal(eventType);

            var taskFuncs = GetWaitTasks(events).Select(
                func => (Func<IEventFilter<IEvent>, int[], Task<IEvent>>) (
                    (filter, types) =>
                    {
                        var task = func(filter, types);

                        Thread.Sleep(100); // allow task to start and begin waiting for events

                        GenerateTaskEvent();

                        return task;
                    })).ToArray();

            for (int i = 0; i < taskFuncs.Length; i++)
            {
                var getWaitTask = taskFuncs[i];

                // No params
                var waitTask = getWaitTask(null, new int[0]);

                waitTask.Wait(timeout);

                // Event types
                waitTask = getWaitTask(null, new[] {EventType.TaskReduced});

                Assert.IsTrue(waitTask.Wait(timeout));
                Assert.IsInstanceOf(typeof(TaskEvent), waitTask.Result);
                Assert.AreEqual(EventType.TaskReduced, waitTask.Result.Type);

                if (i > 3)
                {
                    // Filter
                    waitTask = getWaitTask(new LocalEventFilter<IEvent>(e => e.Type == EventType.TaskReduced), new int[0]);

                    Assert.IsTrue(waitTask.Wait(timeout));
                    Assert.IsInstanceOf(typeof(TaskEvent), waitTask.Result);
                    Assert.AreEqual(EventType.TaskReduced, waitTask.Result.Type);

                    // Filter & types
                    waitTask = getWaitTask(new LocalEventFilter<IEvent>(e => e.Type == EventType.TaskReduced),
                        new[] {EventType.TaskReduced});

                    Assert.IsTrue(waitTask.Wait(timeout));
                    Assert.IsInstanceOf(typeof(TaskEvent), waitTask.Result);
                    Assert.AreEqual(EventType.TaskReduced, waitTask.Result.Type);
                }
            }
        }

        /// <summary>
        /// Gets the wait tasks for different overloads of WaitForLocal.
        /// </summary>
        private static IEnumerable<Func<IEventFilter<IEvent>, int[], Task<IEvent>>> GetWaitTasks(IEvents events)
        {
            yield return (filter, types) => TaskRunner.Run(() => events.WaitForLocal(types));
            yield return (filter, types) => TaskRunner.Run(() => events.WaitForLocal(types.ToList()));

            yield return (filter, types) => events.WaitForLocalAsync(types);
            yield return (filter, types) => events.WaitForLocalAsync(types.ToList());

            yield return (filter, types) => TaskRunner.Run(() => events.WaitForLocal(filter, types));
            yield return (filter, types) => TaskRunner.Run(() => events.WaitForLocal(filter, types.ToList()));

            yield return (filter, types) => events.WaitForLocalAsync(filter, types);
            yield return (filter, types) => events.WaitForLocalAsync(filter, types.ToList());
        }

        /// <summary>
        /// Tests the wait for local overloads.
        /// </summary>
        [Test]
        public void TestWaitForLocalOverloads()
        {

        }

        /*
        /// <summary>
        /// Tests RemoteListen.
        /// </summary>
        [Test]
        public void TestRemoteListen(
            [Values(true, false)] bool async,
            [Values(true, false)] bool binarizable,
            [Values(true, false)] bool autoUnsubscribe)
        {
            foreach (var g in _grids)
            {
                g.GetEvents().EnableLocal(EventType.JobExecutionAll);
                g.GetEvents().EnableLocal(EventType.TaskExecutionAll);
            }

            var events = _grid1.GetEvents();

            var expectedType = EventType.JobStarted;

            var remoteFilter = binary
                ?  (IEventFilter<IEvent>) new RemoteEventBinarizableFilter(expectedType)
                :  new RemoteEventFilter(expectedType);

            var localListener = EventsTestHelper.GetListener();

            if (async)
                events = events.WithAsync();

            var listenId = events.RemoteListen(localListener: localListener, remoteFilter: remoteFilter,
                autoUnsubscribe: autoUnsubscribe);

            if (async)
                listenId = events.GetFuture<Guid>().Get();

            Assert.IsNotNull(listenId);

            CheckSend(3, typeof(JobEvent), expectedType);

            _grid3.GetEvents().DisableLocal(EventType.JobExecutionAll);

            CheckSend(2, typeof(JobEvent), expectedType);

            events.StopRemoteListen(listenId.Value);

            if (async)
                events.GetFuture().Get();

            CheckNoEvent();

            // Check unsubscription with listener
            events.RemoteListen(localListener: localListener, remoteFilter: remoteFilter,
                autoUnsubscribe: autoUnsubscribe);

            if (async)
                events.GetFuture<Guid>().Get();

            CheckSend(2, typeof(JobEvent), expectedType);

            EventsTestHelper.ListenResult = false;

            CheckSend(1, typeof(JobEvent), expectedType);  // one last event

            CheckNoEvent();
        }*/

        /// <summary>
        /// Tests RemoteQuery.
        /// </summary>
        [Test]
        public void TestRemoteQuery([Values(true, false)] bool async)
        {
            foreach (var g in _grids)
                g.GetEvents().EnableLocal(EventType.JobExecutionAll);

            var events = _grid1.GetEvents();

            var eventFilter = new RemoteEventFilter(EventType.JobStarted);

            var oldEvents = events.RemoteQuery(eventFilter);

            GenerateTaskEvent();

            var remoteQuery = !async
                ? events.RemoteQuery(eventFilter, EventsTestHelper.Timeout, EventType.JobExecutionAll)
                : events.RemoteQueryAsync(eventFilter, EventsTestHelper.Timeout, EventType.JobExecutionAll).Result;

            var qryResult = remoteQuery.Except(oldEvents).Cast<JobEvent>().ToList();

            Assert.AreEqual(_grids.Length - 1, qryResult.Count);

            Assert.IsTrue(qryResult.All(x => x.Type == EventType.JobStarted));
        }

        /// <summary>
        /// Tests serialization.
        /// </summary>
        [Test]
        public void TestSerialization()
        {
            var grid = (Ignite) _grid1;
            var comp = (ImplCompute) grid.GetCluster().ForLocal().GetCompute();
            var locNode = grid.GetCluster().GetLocalNode();

            var expectedGuid = Guid.Parse("00000000-0000-0001-0000-000000000002");
            var expectedGridGuid = new IgniteGuid(expectedGuid, 3);

            using (var inStream = IgniteManager.Memory.Allocate().GetStream())
            {
                var result = comp.ExecuteJavaTask<bool>("org.apache.ignite.platform.PlatformEventsWriteEventTask",
                    inStream.MemoryPointer);

                Assert.IsTrue(result);

                inStream.SynchronizeInput();

                var reader = grid.Marshaller.StartUnmarshal(inStream);

                var cacheEvent = EventReader.Read<CacheEvent>(reader);
                CheckEventBase(cacheEvent);
                Assert.AreEqual("cacheName", cacheEvent.CacheName);
                Assert.AreEqual(locNode, cacheEvent.EventNode);
                Assert.AreEqual(1, cacheEvent.Partition);
                Assert.AreEqual(true, cacheEvent.IsNear);
                Assert.AreEqual(2, cacheEvent.Key);
                Assert.AreEqual(expectedGridGuid, cacheEvent.Xid);
                Assert.AreEqual(4, cacheEvent.NewValue);
                Assert.AreEqual(true, cacheEvent.HasNewValue);
                Assert.AreEqual(5, cacheEvent.OldValue);
                Assert.AreEqual(true, cacheEvent.HasOldValue);
                Assert.AreEqual(expectedGuid, cacheEvent.SubjectId);
                Assert.AreEqual("cloClsName", cacheEvent.ClosureClassName);
                Assert.AreEqual("taskName", cacheEvent.TaskName);
                Assert.IsTrue(cacheEvent.ToShortString().StartsWith("NODE_FAILED: IsNear="));

                var qryExecEvent = EventReader.Read<CacheQueryExecutedEvent>(reader);
                CheckEventBase(qryExecEvent);
                Assert.AreEqual("qryType", qryExecEvent.QueryType);
                Assert.AreEqual("cacheName", qryExecEvent.CacheName);
                Assert.AreEqual("clsName", qryExecEvent.ClassName);
                Assert.AreEqual("clause", qryExecEvent.Clause);
                Assert.AreEqual(expectedGuid, qryExecEvent.SubjectId);
                Assert.AreEqual("taskName", qryExecEvent.TaskName);
                Assert.AreEqual(
                    "NODE_FAILED: QueryType=qryType, CacheName=cacheName, ClassName=clsName, Clause=clause, " +
                    "SubjectId=00000000-0000-0001-0000-000000000002, TaskName=taskName", qryExecEvent.ToShortString());

                var qryReadEvent = EventReader.Read<CacheQueryReadEvent>(reader);
                CheckEventBase(qryReadEvent);
                Assert.AreEqual("qryType", qryReadEvent.QueryType);
                Assert.AreEqual("cacheName", qryReadEvent.CacheName);
                Assert.AreEqual("clsName", qryReadEvent.ClassName);
                Assert.AreEqual("clause", qryReadEvent.Clause);
                Assert.AreEqual(expectedGuid, qryReadEvent.SubjectId);
                Assert.AreEqual("taskName", qryReadEvent.TaskName);
                Assert.AreEqual(1, qryReadEvent.Key);
                Assert.AreEqual(2, qryReadEvent.Value);
                Assert.AreEqual(3, qryReadEvent.OldValue);
                Assert.AreEqual(4, qryReadEvent.Row);
                Assert.AreEqual(
                    "NODE_FAILED: QueryType=qryType, CacheName=cacheName, ClassName=clsName, Clause=clause, " +
                    "SubjectId=00000000-0000-0001-0000-000000000002, TaskName=taskName, Key=1, Value=2, " +
                    "OldValue=3, Row=4", qryReadEvent.ToShortString());

                var cacheRebalancingEvent = EventReader.Read<CacheRebalancingEvent>(reader);
                CheckEventBase(cacheRebalancingEvent);
                Assert.AreEqual("cacheName", cacheRebalancingEvent.CacheName);
                Assert.AreEqual(1, cacheRebalancingEvent.Partition);
                Assert.AreEqual(locNode, cacheRebalancingEvent.DiscoveryNode);
                Assert.AreEqual(2, cacheRebalancingEvent.DiscoveryEventType);
                Assert.AreEqual(3, cacheRebalancingEvent.DiscoveryTimestamp);
                Assert.IsTrue(cacheRebalancingEvent.ToShortString().StartsWith(
                    "NODE_FAILED: CacheName=cacheName, Partition=1, DiscoveryNode=GridNode"));

                var checkpointEvent = EventReader.Read<CheckpointEvent>(reader);
                CheckEventBase(checkpointEvent);
                Assert.AreEqual("cpKey", checkpointEvent.Key);
                Assert.AreEqual("NODE_FAILED: Key=cpKey", checkpointEvent.ToShortString());

                var discoEvent = EventReader.Read<DiscoveryEvent>(reader);
                CheckEventBase(discoEvent);
                Assert.AreEqual(grid.TopologyVersion, discoEvent.TopologyVersion);
                Assert.AreEqual(grid.GetNodes(), discoEvent.TopologyNodes);
                Assert.IsTrue(discoEvent.ToShortString().StartsWith("NODE_FAILED: EventNode=GridNode"));

                var jobEvent = EventReader.Read<JobEvent>(reader);
                CheckEventBase(jobEvent);
                Assert.AreEqual(expectedGridGuid, jobEvent.JobId);
                Assert.AreEqual("taskClsName", jobEvent.TaskClassName);
                Assert.AreEqual("taskName", jobEvent.TaskName);
                Assert.AreEqual(locNode, jobEvent.TaskNode);
                Assert.AreEqual(expectedGridGuid, jobEvent.TaskSessionId);
                Assert.AreEqual(expectedGuid, jobEvent.TaskSubjectId);
                Assert.IsTrue(jobEvent.ToShortString().StartsWith("NODE_FAILED: TaskName=taskName"));

                var taskEvent = EventReader.Read<TaskEvent>(reader);
                CheckEventBase(taskEvent);
                Assert.AreEqual(true,taskEvent.Internal);
                Assert.AreEqual(expectedGuid, taskEvent.SubjectId);
                Assert.AreEqual("taskClsName", taskEvent.TaskClassName);
                Assert.AreEqual("taskName", taskEvent.TaskName);
                Assert.AreEqual(expectedGridGuid, taskEvent.TaskSessionId);
                Assert.IsTrue(taskEvent.ToShortString().StartsWith("NODE_FAILED: TaskName=taskName"));
            }
        }

        /// <summary>
        /// Tests the event store configuration.
        /// </summary>
        [Test]
        public void TestConfiguration()
        {
            var cfg = _grid1.GetConfiguration().EventStorageSpi as MemoryEventStorageSpi;

            Assert.IsNotNull(cfg);

            Assert.AreEqual(MemoryEventStorageSpi.DefaultExpirationTimeout, cfg.ExpirationTimeout);
            Assert.AreEqual(MemoryEventStorageSpi.DefaultMaxEventCount, cfg.MaxEventCount);

            // Test user-defined event storage.
            var igniteCfg = new IgniteConfiguration(TestUtils.GetTestConfiguration())
            {
                IgniteInstanceName = "grid4",
                EventStorageSpi = new MyEventStorage()
            };

            var ex = Assert.Throws<IgniteException>(() => Ignition.Start(igniteCfg));
            Assert.AreEqual("Unsupported IgniteConfiguration.EventStorageSpi: " +
                            "'Apache.Ignite.Core.Tests.MyEventStorage'. Supported implementations: " +
                            "'Apache.Ignite.Core.Events.NoopEventStorageSpi', " +
                            "'Apache.Ignite.Core.Events.MemoryEventStorageSpi'.", ex.Message);
        }

        /// <summary>
        /// Checks base event fields serialization.
        /// </summary>
        /// <param name="evt">The evt.</param>
        private void CheckEventBase(IEvent evt)
        {
            var locNode = _grid1.GetCluster().GetLocalNode();

            Assert.AreEqual(locNode, evt.Node);
            Assert.AreEqual("msg", evt.Message);
            Assert.AreEqual(EventType.NodeFailed, evt.Type);
            Assert.IsNotEmpty(evt.Name);
            Assert.AreNotEqual(Guid.Empty, evt.Id.GlobalId);
            Assert.IsTrue(Math.Abs((evt.Timestamp - DateTime.UtcNow).TotalSeconds) < 20,
                "Invalid event timestamp: '{0}', current time: '{1}'", evt.Timestamp, DateTime.Now);

            Assert.Greater(evt.LocalOrder, 0);

            Assert.IsTrue(evt.ToString().Contains("[Name=NODE_FAILED"));
            Assert.IsTrue(evt.ToShortString().StartsWith("NODE_FAILED"));
        }

        /// <summary>
        /// Sends events in various ways and verifies correct receive.
        /// </summary>
        /// <param name="repeat">Expected event count multiplier.</param>
        /// <param name="eventObjectType">Expected event object type.</param>
        /// <param name="eventType">Type of the event.</param>
        private void CheckSend(int repeat = 1, Type eventObjectType = null, params int[] eventType)
        {
            EventsTestHelper.ClearReceived(repeat);

            GenerateTaskEvent();

            EventsTestHelper.VerifyReceive(repeat, eventObjectType ?? typeof (TaskEvent),
                eventType.Any() ? eventType : EventType.TaskExecutionAll);
        }

        /// <summary>
        /// Checks that no event has arrived.
        /// </summary>
        private void CheckNoEvent()
        {
            // this will result in an exception in case of a event
            EventsTestHelper.ClearReceived(0);

            GenerateTaskEvent();

            Thread.Sleep(EventsTestHelper.Timeout);

            EventsTestHelper.AssertFailures();
        }

        /// <summary>
        /// Gets the Ignite configuration.
        /// </summary>
        private static IgniteConfiguration GetConfiguration(string name, bool client = false)
        {
            return new IgniteConfiguration(TestUtils.GetTestConfiguration())
            {
                IgniteInstanceName = name,
                EventStorageSpi = new MemoryEventStorageSpi(),
                CacheConfiguration = new [] {new CacheConfiguration(CacheName) },
                ClientMode = client
            };
        }

        /// <summary>
        /// Generates the task event.
        /// </summary>
        private void GenerateTaskEvent()
        {
            _grid1.GetCompute().Broadcast(new ComputeAction());
        }

        /// <summary>
        /// Generates the task event.
        /// </summary>
        private static void GenerateTaskEvent(IIgnite grid)
        {
            grid.GetCompute().Broadcast(new ComputeAction());
        }

        /// <summary>
        /// Verifies the task events.
        /// </summary>
        private static void VerifyTaskEvents(IEnumerable<IEvent> events)
        {
            var e = events.Cast<TaskEvent>().ToArray();

            // started, reduced, finished
            Assert.AreEqual(
                new[] {EventType.TaskStarted, EventType.TaskReduced, EventType.TaskFinished},
                e.Select(x => x.Type).ToArray());
        }

        /// <summary>
        /// Generates the cache query event.
        /// </summary>
        private static void GenerateCacheQueryEvent(IIgnite g)
        {
            var cache = g.GetCache<int, int>(CacheName);

            cache.Clear();

            cache.Put(TestUtils.GetPrimaryKey(g, CacheName), 1);

            cache.Query(new ScanQuery<int, int>()).GetAll();
        }

        /// <summary>
        /// Verifies the cache events.
        /// </summary>
        private static void VerifyCacheEvents(IEnumerable<IEvent> events, IIgnite grid)
        {
            var e = events.Cast<CacheEvent>().ToArray();

            foreach (var cacheEvent in e)
            {
                Assert.AreEqual(CacheName, cacheEvent.CacheName);
                Assert.AreEqual(null, cacheEvent.ClosureClassName);
                Assert.AreEqual(null, cacheEvent.TaskName);
                Assert.AreEqual(grid.GetCluster().GetLocalNode(), cacheEvent.EventNode);
                Assert.AreEqual(grid.GetCluster().GetLocalNode(), cacheEvent.Node);

                Assert.AreEqual(false, cacheEvent.HasOldValue);
                Assert.AreEqual(null, cacheEvent.OldValue);

                if (cacheEvent.Type == EventType.CacheObjectPut)
                {
                    Assert.AreEqual(true, cacheEvent.HasNewValue);
                    Assert.AreEqual(1, cacheEvent.NewValue);
                }
                else if (cacheEvent.Type == EventType.CacheEntryCreated)
                {
                    Assert.AreEqual(false, cacheEvent.HasNewValue);
                    Assert.AreEqual(null, cacheEvent.NewValue);
                }
                else if (cacheEvent.Type == EventType.CacheEntryDestroyed)
                {
                    Assert.IsFalse(cacheEvent.HasNewValue);
                    Assert.IsFalse(cacheEvent.HasOldValue);
                }
                else
                {
                    Assert.Fail("Unexpected event type");
                }
            }
        }

        /// <summary>
        /// Starts the grids.
        /// </summary>
        private void StartGrids()
        {
            if (_grid1 != null)
                return;

            _grid1 = Ignition.Start(GetConfiguration("grid1"));
            _grid2 = Ignition.Start(GetConfiguration("grid2"));
            _grid3 = Ignition.Start(GetConfiguration("grid3", true));

            _grids = new[] {_grid1, _grid2, _grid3};
        }

        /// <summary>
        /// Stops the grids.
        /// </summary>
        private void StopGrids()
        {
            _grid1 = _grid2 = _grid3 = null;
            _grids = null;

            Ignition.StopAll(true);
        }
    }

    /// <summary>
    /// Event test helper class.
    /// </summary>
    [Serializable]
    public static class EventsTestHelper
    {
        /** */
        public static readonly ConcurrentStack<IEvent> ReceivedEvents = new ConcurrentStack<IEvent>();

        /** */
        public static readonly ConcurrentStack<string> Failures = new ConcurrentStack<string>();

        /** */
        public static readonly CountdownEvent ReceivedEvent = new CountdownEvent(0);

        /** */
        public static readonly ConcurrentStack<Guid?> LastNodeIds = new ConcurrentStack<Guid?>();

        /** */
        public static volatile bool ListenResult = true;

        /** */
        public static readonly TimeSpan Timeout = TimeSpan.FromMilliseconds(800);

        /// <summary>
        /// Clears received event information.
        /// </summary>
        /// <param name="expectedCount">The expected count of events to be received.</param>
        public static void ClearReceived(int expectedCount)
        {
            ReceivedEvents.Clear();
            ReceivedEvent.Reset(expectedCount);
            LastNodeIds.Clear();
        }

        /// <summary>
        /// Verifies received events against events events.
        /// </summary>
        public static void VerifyReceive(int count, Type eventObjectType, ICollection<int> eventTypes)
        {
            // check if expected event count has been received; Wait returns false if there were none.
            Assert.IsTrue(ReceivedEvent.Wait(Timeout),
                "Failed to receive expected number of events. Remaining count: " + ReceivedEvent.CurrentCount);

            Assert.AreEqual(count, ReceivedEvents.Count);

            Assert.IsTrue(ReceivedEvents.All(x => x.GetType() == eventObjectType));

            Assert.IsTrue(ReceivedEvents.All(x => eventTypes.Contains(x.Type)));

            AssertFailures();
        }

        /// <summary>
        /// Gets the event listener.
        /// </summary>
        /// <returns>New instance of event listener.</returns>
        public static IEventListener<IEvent> GetListener()
        {
            return new LocalEventFilter<IEvent>(Listen);
        }

        /// <summary>
        /// Combines accumulated failures and throws an assertion, if there are any.
        /// Clears accumulated failures.
        /// </summary>
        public static void AssertFailures()
        {
            try
            {
                if (Failures.Any())
                    Assert.Fail(Failures.Reverse().Aggregate((x, y) => string.Format("{0}\n{1}", x, y)));
            }
            finally
            {
                Failures.Clear();
            }
        }

        /// <summary>
        /// Listen method.
        /// </summary>
        /// <param name="evt">Event.</param>
        private static bool Listen(IEvent evt)
        {
            try
            {
                LastNodeIds.Push(evt.Node.Id);
                ReceivedEvents.Push(evt);

                ReceivedEvent.Signal();

                return ListenResult;
            }
            catch (Exception ex)
            {
                // When executed on remote nodes, these exceptions will not go to sender,
                // so we have to accumulate them.
                Failures.Push(string.Format("Exception in Listen (msg: {0}, id: {1}): {2}", evt, evt.Node.Id, ex));
                throw;
            }
        }
    }

    /// <summary>
    /// Test event filter.
    /// </summary>
    [Serializable]
    public class LocalEventFilter<T> : IEventFilter<T>, IEventListener<T> where T : IEvent
    {
        /** */
        private readonly Func<T, bool> _invoke;

        /// <summary>
        /// Initializes a new instance of the <see cref="RemoteListenEventFilter"/> class.
        /// </summary>
        /// <param name="invoke">The invoke delegate.</param>
        public LocalEventFilter(Func<T, bool> invoke)
        {
            _invoke = invoke;
        }

        /** <inheritdoc /> */
        bool IEventFilter<T>.Invoke(T evt)
        {
            return _invoke(evt);
        }

        /** <inheritdoc /> */
        bool IEventListener<T>.Invoke(T evt)
        {
            return _invoke(evt);
        }

        /// <summary>
        /// Invalid Invoke method for tests.
        /// </summary>
        // ReSharper disable once UnusedMember.Global
        public bool Invoke(T evt)
        {
            throw new Exception("Invalid method");
        }
    }

    /// <summary>
    /// Remote event filter.
    /// </summary>
    [Serializable]
    public class RemoteEventFilter : IEventFilter<IEvent>
    {
        /** */
        private readonly int _type;

        /** */
        [InstanceResource]
        public IIgnite Ignite { get; set; }

        public RemoteEventFilter(int type)
        {
            _type = type;
        }

        /** <inheritdoc /> */
        public bool Invoke(IEvent evt)
        {
            Assert.IsNotNull(Ignite);

            return evt.Type == _type;
        }
    }

    /// <summary>
    /// Event test case.
    /// </summary>
    public class EventTestCase
    {
        /// <summary>
        /// Gets or sets the type of the event.
        /// </summary>
        public ICollection<int> EventType { get; set; }

        /// <summary>
        /// Gets or sets the type of the event object.
        /// </summary>
        public Type EventObjectType { get; set; }

        /// <summary>
        /// Gets or sets the generate event action.
        /// </summary>
        public Action<IIgnite> GenerateEvent { get; set; }

        /// <summary>
        /// Gets or sets the verify events action.
        /// </summary>
        public Action<IEnumerable<IEvent>, IIgnite> VerifyEvents { get; set; }

        /// <summary>
        /// Gets or sets the event count.
        /// </summary>
        public int EventCount { get; set; }

        /** <inheritdoc /> */
        public override string ToString()
        {
            return EventObjectType.ToString();
        }
    }

    /// <summary>
    /// Custom event.
    /// </summary>
    public class MyEvent : IEvent
    {
        /** <inheritdoc /> */
        public IgniteGuid Id
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public long LocalOrder
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public IClusterNode Node
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public string Message
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public int Type
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public string Name
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public DateTime Timestamp
        {
            get { throw new NotImplementedException(); }
        }

        /** <inheritdoc /> */
        public string ToShortString()
        {
            throw new NotImplementedException();
        }
    }

    public class MyEventStorage : IEventStorageSpi
    {
        // No-op.
    }
}