/// <summary> /// Initiate log-only checkpoint /// </summary> /// <param name="token">Checkpoint token</param> /// <param name="checkpointType">Checkpoint type</param> /// <param name="tryIncremental">For snapshot, try to store as incremental delta over last snapshot</param> /// <param name="targetVersion"> /// intended version number of the next version. Checkpoint will not execute if supplied version is not larger /// than current version. Actual new version may have version number greater than supplied number. If the supplied /// number is -1, checkpoint will unconditionally create a new version. /// </param> /// <returns>Whether we could initiate the checkpoint. Use CompleteCheckpointAsync to wait completion.</returns> public bool TakeHybridLogCheckpoint(out Guid token, CheckpointType checkpointType, bool tryIncremental = false, long targetVersion = -1) { ISynchronizationTask backend; if (checkpointType == CheckpointType.FoldOver) { backend = new FoldOverCheckpointTask(); } else if (checkpointType == CheckpointType.Snapshot) { if (tryIncremental && _lastSnapshotCheckpoint.info.guid != default && _lastSnapshotCheckpoint.info.finalLogicalAddress > hlog.FlushedUntilAddress) { backend = new IncrementalSnapshotCheckpointTask(); } else { backend = new SnapshotCheckpointTask(); } } else { throw new FasterException("Unsupported checkpoint type"); } var result = StartStateMachine(new HybridLogCheckpointStateMachine(backend, targetVersion)); token = _hybridLogCheckpointToken; return(result); }
private void Prepare(CheckpointType checkpointType, out string logPath, out string objPath, out IDevice log, out IDevice objlog, out FasterKV <MyKey, MyValue> h, out MyContext context) { logPath = Path.Combine(FasterFolderPath, $"FasterRecoverTests.log"); objPath = Path.Combine(FasterFolderPath, $"FasterRecoverTests_HEAP.log"); log = Devices.CreateLogDevice(logPath); objlog = Devices.CreateLogDevice(objPath); h = new FasterKV <MyKey, MyValue> (1L << 20, new LogSettings { LogDevice = log, ObjectLogDevice = objlog, SegmentSizeBits = 12, MemorySizeBits = 12, PageSizeBits = 9 }, new CheckpointSettings() { CheckpointDir = Path.Combine(FasterFolderPath, "check-points"), CheckPointType = checkpointType }, new SerializerSettings <MyKey, MyValue> { keySerializer = () => new MyKeySerializer(), valueSerializer = () => new MyValueSerializer() } ); context = new MyContext(); }
public void ObjectRecoveryTest1([Values] CheckpointType checkpointType) { Prepare(checkpointType, out string logPath, out string objPath, out IDevice log, out IDevice objlog, out FasterKV <MyKey, MyValue, MyInput, MyOutput, MyContext, MyFunctions> h, out MyContext context); h.StartSession(); Write(h, context); h.Refresh(); Read(h, context, false); h.TakeFullCheckpoint(out Guid CheckPointID); h.CompleteCheckpoint(true); Destroy(log, objlog, h); Prepare(checkpointType, out logPath, out objPath, out log, out objlog, out h, out context); h.Recover(); h.StartSession(); Read(h, context, true); Destroy(log, objlog, h); }
public void ObjectRecoveryTest1( [Values] CheckpointType checkpointType, [Range(100, 1500, 600)] int iterations) { this.iterations = iterations; Prepare(checkpointType, out _, out _, out IDevice log, out IDevice objlog, out FasterKV <MyKey, MyValue> h, out MyContext context); var session1 = h.For(new MyFunctions()).NewSession <MyFunctions>(); Write(session1, context, h); Read(session1, context, false); session1.Dispose(); h.TakeFullCheckpoint(out _); h.CompleteCheckpointAsync().GetAwaiter().GetResult(); Destroy(log, objlog, h); Prepare(checkpointType, out _, out _, out log, out objlog, out h, out context); h.Recover(); var session2 = h.For(new MyFunctions()).NewSession <MyFunctions>(); Read(session2, context, true); session2.Dispose(); Destroy(log, objlog, h); }
public void AddCheckpoint( string happeningId, string id, CheckpointType checkpointType, int order, string name, double latitude, double longitude, decimal distanceFromPrevious, decimal distanceFromStart) { // Only one can be start this.ValidateUniqueCheckpointType(checkpointType, CheckpointType.Start); // Only one can be end this.ValidateUniqueCheckpointType(checkpointType, CheckpointType.Start); // All ok, add this.Apply( new CheckpointValidated( happeningId, id, order, checkpointType, name, latitude, longitude, distanceFromPrevious, distanceFromStart)); }
public void ObjectRecoveryTest1([Values] CheckpointType checkpointType) { Prepare(checkpointType, out _, out _, out IDevice log, out IDevice objlog, out FasterKV <MyKey, MyValue, MyInput, MyOutput, MyContext, MyFunctions> h, out MyContext context); var session1 = h.NewSession(); Write(session1, context); Read(session1, context, false); session1.Dispose(); h.TakeFullCheckpoint(out _); h.CompleteCheckpointAsync().GetAwaiter().GetResult(); Destroy(log, objlog, h); Prepare(checkpointType, out _, out _, out log, out objlog, out h, out context); h.Recover(); var session2 = h.NewSession(); Read(session2, context, true); session2.Dispose(); Destroy(log, objlog, h); }
/// <summary> /// Initiate full checkpoint /// </summary> /// <param name="token">Checkpoint token</param> /// <param name="checkpointType">Checkpoint type</param> /// <param name="targetVersion"> /// intended version number of the next version. Checkpoint will not execute if supplied version is not larger /// than current version. Actual new version may have version number greater than supplied number. If the supplied /// number is -1, checkpoint will unconditionally create a new version. /// </param> /// <returns> /// Whether we successfully initiated the checkpoint (initiation may /// fail if we are already taking a checkpoint or performing some other /// operation such as growing the index). Use CompleteCheckpointAsync to wait completion. /// </returns> public bool TakeFullCheckpoint(out Guid token, CheckpointType checkpointType, long targetVersion = -1) { ISynchronizationTask backend; if (checkpointType == CheckpointType.FoldOver) { backend = new FoldOverCheckpointTask(); } else if (checkpointType == CheckpointType.Snapshot) { backend = new SnapshotCheckpointTask(); } else { throw new FasterException("Unsupported full checkpoint type"); } var result = StartStateMachine(new FullCheckpointStateMachine(backend, targetVersion)); if (result) { token = _hybridLogCheckpointToken; } else { token = default; } return(result); }
private bool IsCheckpointSafe(Guid token, CheckpointType checkpointType) { switch (checkpointType) { case CheckpointType.INDEX_ONLY: { var dir = new DirectoryInfo(directoryConfiguration.GetIndexCheckpointFolder(token)); return(File.Exists(dir.FullName + Path.DirectorySeparatorChar + "completed.dat")); } case CheckpointType.HYBRID_LOG_ONLY: { var dir = new DirectoryInfo(directoryConfiguration.GetHybridLogCheckpointFolder(token)); return(File.Exists(dir.FullName + Path.DirectorySeparatorChar + "completed.dat")); } case CheckpointType.FULL: { return(IsCheckpointSafe(token, CheckpointType.INDEX_ONLY) && IsCheckpointSafe(token, CheckpointType.HYBRID_LOG_ONLY)); } default: return(false); } }
public async ValueTask ObjectRecoveryTest3( [Values] CheckpointType checkpointType, [Values(2000)] int iterations, [Values] bool isAsync) { this.iterations = iterations; Prepare(checkpointType, out _, out _, out IDevice log, out IDevice objlog, out FasterKV <MyKey, MyValue> h, out MyContext context); var session1 = h.For(new MyFunctions()).NewSession <MyFunctions>(); var tokens = Write(session1, context, h); Read(session1, context, false, iterations); session1.Dispose(); h.TakeHybridLogCheckpoint(out Guid token); h.CompleteCheckpointAsync().GetAwaiter().GetResult(); tokens.Add((iterations, token)); Destroy(log, objlog, h); foreach (var item in tokens) { Prepare(checkpointType, out _, out _, out log, out objlog, out h, out context); if (isAsync) { await h.RecoverAsync(default, item.Item2);
public void RecoveryCheck2([Values] CheckpointType checkpointType) { using var s1 = fht1.NewSession(new SimpleFunctions <long, long>()); using var fht2 = new FasterKV <long, long> (1L << 10, logSettings: new LogSettings { LogDevice = log, MutableFraction = 1, PageSizeBits = 10, MemorySizeBits = 20 }, checkpointSettings: new CheckpointSettings { CheckpointDir = path } ); for (int i = 0; i < 5; i++) { for (long key = 1000 * i; key < 1000 * i + 1000; key++) { s1.Upsert(ref key, ref key); } fht1.TakeHybridLogCheckpointAsync(checkpointType).GetAwaiter().GetResult(); fht2.Recover(); Assert.IsTrue(fht1.Log.HeadAddress == fht2.Log.HeadAddress); Assert.IsTrue(fht1.Log.ReadOnlyAddress == fht2.Log.ReadOnlyAddress); Assert.IsTrue(fht1.Log.TailAddress == fht2.Log.TailAddress); using var s2 = fht2.NewSession(new SimpleFunctions <long, long>()); for (long key = 0; key < 1000 * i + 1000; key++) { long output = default; var status = s2.Read(ref key, ref output); Assert.IsTrue(status == Status.OK && output == key); } } }
public DynamicRaceCheckpoint(CheckpointType type, Vector3 position, Vector3 nextPosition, float size = 3.0f, int worldid = -1, int interiorid = -1, BasePlayer player = null, float streamdistance = 100.0f, DynamicArea area = null, int priority = 0) { Id = Internal.CreateDynamicRaceCP((int)type, position.X, position.Y, position.Z, nextPosition.X, nextPosition.Y, nextPosition.Z, size, worldid, interiorid, player?.Id ?? -1, streamdistance, area?.Id ?? -1, priority); }
public async ValueTask LocalDeviceSimpleRecoveryTest([Values] CheckpointType checkpointType, [Values] bool isAsync, [Values] bool testCommitCookie) { checkpointManager = new DeviceLogCommitCheckpointManager( new LocalStorageNamedDeviceFactory(), new DefaultCheckpointNamingScheme($"{TestUtils.MethodTestDir}/{TestUtils.AzureTestDirectory}")); await SimpleRecoveryTest1_Worker(checkpointType, isAsync, testCommitCookie); checkpointManager.PurgeAll(); }
public async ValueTask PageBlobSimpleRecoveryTest([Values] CheckpointType checkpointType, [Values] bool isAsync, [Values] bool testCommitCookie) { TestUtils.IgnoreIfNotRunningAzureTests(); checkpointManager = new DeviceLogCommitCheckpointManager( new AzureStorageNamedDeviceFactory(TestUtils.AzureEmulatedStorageString), new DefaultCheckpointNamingScheme($"{TestUtils.AzureTestContainer}/{TestUtils.AzureTestDirectory}")); await SimpleRecoveryTest1_Worker(checkpointType, isAsync, testCommitCookie); checkpointManager.PurgeAll(); }
public void LocalDeviceSimpleRecoveryTest(CheckpointType checkpointType) { ICheckpointManager checkpointManager = new DeviceLogCommitCheckpointManager( new LocalStorageNamedDeviceFactory(), new DefaultCheckpointNamingScheme($"{TEST_CONTAINER}/PageBlobSimpleRecoveryTest")); SimpleRecoveryTest1(checkpointType, checkpointManager); checkpointManager.PurgeAll(); checkpointManager.Dispose(); }
public void ChangeType(string id, CheckpointType newType) { // Only one can be start this.ValidateUniqueCheckpointType(newType, CheckpointType.Start); // Only one can be end this.ValidateUniqueCheckpointType(newType, CheckpointType.Start); // All ok, change this.Apply(new CheckpointTypeChangeValidated(id, newType)); }
/// <summary> /// Take full (index + log) checkpoint /// </summary> /// <param name="checkpointType">Checkpoint type</param> /// <param name="cancellationToken">Cancellation token</param> /// <returns> /// (bool success, Guid token) /// success: Whether we successfully initiated the checkpoint (initiation may /// fail if we are already taking a checkpoint or performing some other /// operation such as growing the index). /// token: Token for taken checkpoint /// Await task to complete checkpoint, if initiated successfully /// </returns> public async ValueTask <(bool success, Guid token)> TakeFullCheckpointAsync(CheckpointType checkpointType, CancellationToken cancellationToken = default) { var success = TakeFullCheckpoint(out Guid token, checkpointType); if (success) { await CompleteCheckpointAsync(cancellationToken); } return(success, token); }
public async ValueTask LocalDeviceSimpleRecoveryTest([Values] CheckpointType checkpointType, [Values] bool isAsync) { ICheckpointManager checkpointManager = new DeviceLogCommitCheckpointManager( new LocalStorageNamedDeviceFactory(), new DefaultCheckpointNamingScheme($"{TEST_CONTAINER}/PageBlobSimpleRecoveryTest")); await SimpleRecoveryTest1_Worker(checkpointType, checkpointManager, isAsync); checkpointManager.PurgeAll(); checkpointManager.Dispose(); }
/// <summary> /// Take full (index + log) checkpoint /// </summary> /// <param name="checkpointType">Checkpoint type</param> /// <param name="cancellationToken">Cancellation token</param> /// <param name="targetVersion"> /// intended version number of the next version. Checkpoint will not execute if supplied version is not larger /// than current version. Actual new version may have version number greater than supplied number. If the supplied /// number is -1, checkpoint will unconditionally create a new version. /// </param> /// <returns> /// (bool success, Guid token) /// success: Whether we successfully initiated the checkpoint (initiation may /// fail if we are already taking a checkpoint or performing some other /// operation such as growing the index). /// token: Token for taken checkpoint /// Await task to complete checkpoint, if initiated successfully /// </returns> public async ValueTask <(bool success, Guid token)> TakeFullCheckpointAsync(CheckpointType checkpointType, CancellationToken cancellationToken = default, long targetVersion = -1) { var success = TakeFullCheckpoint(out Guid token, checkpointType, targetVersion); if (success) { await CompleteCheckpointAsync(cancellationToken).ConfigureAwait(false); } return(success, token); }
private void ValidateUniqueCheckpointType(CheckpointType checkpointType, CheckpointType uniqueType) { if (checkpointType != uniqueType) { return; } if (this.State.Checkpoints.Any(m => m.CheckpointType == uniqueType)) { throw new InvalidOperationException(); } }
public void PageBlobSimpleRecoveryTest(CheckpointType checkpointType) { if ("yes".Equals(Environment.GetEnvironmentVariable("RunAzureTests"))) { ICheckpointManager checkpointManager = new DeviceLogCommitCheckpointManager( new AzureStorageNamedDeviceFactory(EMULATED_STORAGE_STRING), new DefaultCheckpointNamingScheme($"{TEST_CONTAINER}/PageBlobSimpleRecoveryTest")); SimpleRecoveryTest1(checkpointType, checkpointManager); checkpointManager.PurgeAll(); checkpointManager.Dispose(); } }
public async ValueTask PageBlobSimpleRecoveryTest([Values] CheckpointType checkpointType, [Values] bool isAsync) { if ("yes".Equals(Environment.GetEnvironmentVariable("RunAzureTests"))) { ICheckpointManager checkpointManager = new DeviceLogCommitCheckpointManager( new AzureStorageNamedDeviceFactory(EMULATED_STORAGE_STRING), new DefaultCheckpointNamingScheme($"{TEST_CONTAINER}/PageBlobSimpleRecoveryTest")); await SimpleRecoveryTest1_Worker(checkpointType, checkpointManager, isAsync); checkpointManager.PurgeAll(); checkpointManager.Dispose(); } }
[InlineData(50_000, 1, CheckpointType.Snapshot)] //OK public async Task AddRestartColdRead(int loops, int step, CheckpointType checkpointType) { var options = GetOptions($"{nameof(AddRestartGetValues)}-{loops}"); options.CheckPointType = checkpointType; options.DeleteOnClose = false; Stopwatch watch = new Stopwatch(); watch.Reset(); FasterDictionary <int, string> .ReadResult result; using (var dictionary = new FasterDictionary <int, string>(TestHelper.GetKeyComparer <int>(), options)) { for (var i = 0; i < loops; i++) { var guid = GetGuid(i); dictionary.Upsert(i, guid).Dismiss(); } await dictionary.Ping(); for (var i = 0; i < loops; i += step) { var guid = GetGuid(loops - 1); result = await dictionary.TryGet(loops - 1); Assert.True(result.Found); Assert.Equal(guid.ToString(), result.Value); } await dictionary.Save(); } for (var k = 0; k < 3; k++) { using (var dictionary = new FasterDictionary <int, string>(TestHelper.GetKeyComparer <int>(), options)) { await dictionary.Ping(); for (var i = 0; i < loops; i += step) { var guid = GetGuid(loops - 1); result = await dictionary.TryGet(loops - 1); Assert.True(result.Found); Assert.Equal(guid.ToString(), result.Value); } } } }
private bool InternalTakeCheckpoint(CheckpointType type) { if (_systemState.phase == Phase.REST) { var context = (long)type; var currentState = SystemState.Make(Phase.REST, _systemState.version); var nextState = GetNextState(currentState, type); return(GlobalMoveToNextState(currentState, nextState, ref context)); } else { return(false); } }
[InlineData(1_000_000, CheckpointType.FoldOver)] //FAIL public async Task AddUpdateGet(int loops, CheckpointType checkpointType) { var options = GetOptions($"{nameof(AddIterateUpdateIterate)}-{loops}"); options.CheckPointType = checkpointType; options.DeleteOnClose = false; FasterDictionary <int, string> .ReadResult result; using (var dictionary = new FasterDictionary <int, string>(TestHelper.GetKeyComparer <int>(), options)) { for (var i = 0; i < loops; i++) { dictionary.Upsert(i, (i + 1).ToString()).Dismiss(); } await dictionary.Save(); } using (var dictionary = new FasterDictionary <int, string>(TestHelper.GetKeyComparer <int>(), options)) { for (var i = 0; i < loops; i++) { dictionary.Upsert(i, (i + 2).ToString()).Dismiss(); } await dictionary.Save(); } options.DeleteOnClose = true; using (var dictionary = new FasterDictionary <int, string>(TestHelper.GetKeyComparer <int>(), options)) { for (var i = 0; i < 100; i++) { var guid = GetGuid(i); result = await dictionary.TryGet(i); Assert.True(result.Found); Assert.Equal((result.Key + 2).ToString(), result.Value); } result = await dictionary.TryGet(loops); Assert.False(result.Found); } }
/// <summary> /// Create FASTER instance /// </summary> /// <param name="size">Size of core index (#cache lines)</param> /// <param name="comparer">FASTER equality comparer for key</param> /// <param name="functions">Callback functions</param> /// <param name="logSettings">Log settings</param> /// <param name="checkpointSettings">Checkpoint settings</param> /// <param name="serializerSettings">Serializer settings</param> public FasterKV(long size, Functions functions, LogSettings logSettings, CheckpointSettings checkpointSettings = null, SerializerSettings <Key, Value> serializerSettings = null, IFasterEqualityComparer <Key> comparer = null) { if (comparer != null) { this.comparer = comparer; } else { if (typeof(IFasterEqualityComparer <Key>).IsAssignableFrom(typeof(Key))) { this.comparer = new Key() as IFasterEqualityComparer <Key>; } else { Console.WriteLine("***WARNING*** Creating default FASTER key equality comparer based on potentially slow EqualityComparer<Key>.Default. To avoid this, provide a comparer (IFasterEqualityComparer<Key>) as an argument to FASTER's constructor, or make Key implement the interface IFasterEqualityComparer<Key>"); this.comparer = FasterEqualityComparer <Key> .Default; } } if (checkpointSettings == null) { checkpointSettings = new CheckpointSettings(); } directoryConfiguration = new DirectoryConfiguration(checkpointSettings.CheckpointDir); FoldOverSnapshot = checkpointSettings.CheckPointType == core.CheckpointType.FoldOver; CopyReadsToTail = logSettings.CopyReadsToTail; this.functions = functions; if (Utility.IsBlittable <Key>() && Utility.IsBlittable <Value>()) { hlog = new BlittableAllocator <Key, Value>(logSettings, this.comparer); } else { hlog = new GenericAllocator <Key, Value>(logSettings, serializerSettings, this.comparer); } hlog.Initialize(); sectorSize = (int)logSettings.LogDevice.SectorSize; Initialize(size, sectorSize); _systemState = default(SystemState); _systemState.phase = Phase.REST; _systemState.version = 1; _checkpointType = CheckpointType.HYBRID_LOG_ONLY; }
public FasterKV(long size, IDevice logDevice, IDevice objectLogDevice, string checkpointDir = null) { if (checkpointDir != null) { Config.CheckpointDirectory = checkpointDir; } hlog = new PersistentMemoryMalloc(logDevice, objectLogDevice); var recordSize = Layout.EstimatePhysicalSize(null, null); Initialize(size, hlog.GetSectorSize()); _systemState = default(SystemState); _systemState.phase = Phase.REST; _systemState.version = 1; _checkpointType = CheckpointType.HYBRID_LOG_ONLY; }
public RecoveryStatus(int capacity, long startPage, long endPage, long untilAddress, CheckpointType checkpointType) { this.capacity = capacity; this.startPage = startPage; this.endPage = endPage; this.untilAddress = untilAddress; this.checkpointType = checkpointType; readStatus = new ReadStatus[capacity]; flushStatus = new FlushStatus[capacity]; for (int i = 0; i < capacity; i++) { flushStatus[i] = FlushStatus.Done; readStatus[i] = ReadStatus.Pending; } }
public async ValueTask RecoveryCheck1([Values] CheckpointType checkpointType, [Values] bool isAsync, [Values] bool useReadCache, [Values(128, 1 << 10)] int size) { using var fht1 = new FasterKV <long, long> (size, logSettings: new LogSettings { LogDevice = log, MutableFraction = 1, PageSizeBits = 10, MemorySizeBits = 20, ReadCacheSettings = useReadCache ? new ReadCacheSettings() : null }, checkpointSettings: new CheckpointSettings { CheckpointDir = path } ); using var s1 = fht1.NewSession(new MyFunctions()); for (long key = 0; key < 1000; key++) { s1.Upsert(ref key, ref key); } if (useReadCache) { fht1.Log.FlushAndEvict(true); for (long key = 0; key < 1000; key++) { long output = default; var status = s1.Read(ref key, ref output); if (status != Status.PENDING) { Assert.AreEqual(Status.OK, status, $"status = {status}"); Assert.AreEqual(key, output, $"output = {output}"); } } s1.CompletePending(true); } var task = fht1.TakeFullCheckpointAsync(checkpointType); using var fht2 = new FasterKV <long, long> (size, logSettings: new LogSettings { LogDevice = log, MutableFraction = 1, PageSizeBits = 10, MemorySizeBits = 20, ReadCacheSettings = useReadCache ? new ReadCacheSettings() : null }, checkpointSettings: new CheckpointSettings { CheckpointDir = path } ); if (isAsync) { var(status, token) = await task; await fht2.RecoverAsync(default, token);
/// <summary> /// Create FASTER instance /// </summary> /// <param name="size"></param> /// <param name="logSettings"></param> /// <param name="checkpointSettings"></param> public FasterKV(long size, LogSettings logSettings, CheckpointSettings checkpointSettings = null) { if (checkpointSettings == null) { checkpointSettings = new CheckpointSettings(); } Config.CheckpointDirectory = checkpointSettings.CheckpointDir; FoldOverSnapshot = checkpointSettings.CheckPointType == core.CheckpointType.FoldOver; hlog = new PersistentMemoryMalloc(logSettings, this); var recordSize = Layout.EstimatePhysicalSize(null, null); Initialize(size, hlog.GetSectorSize()); _systemState = default(SystemState); _systemState.phase = Phase.REST; _systemState.version = 1; _checkpointType = CheckpointType.HYBRID_LOG_ONLY; }
private bool InternalTakeCheckpoint(CheckpointType type) { if (_systemState.phase == Phase.GC) { Debug.WriteLine("Forcing completion of GC"); GarbageCollectBuckets(0, true); } if (_systemState.phase == Phase.REST) { var context = (long)type; var currentState = SystemState.Make(Phase.REST, _systemState.version); var nextState = GetNextState(currentState, type); return(GlobalMoveToNextState(currentState, nextState, ref context)); } else { return(false); } }
/// <summary> /// Constructor /// </summary> /// <param name="number"></param> /// <param name="id"></param> public ArbiterCheckpoint(int number, IAreaSubtypeWaypointId id) { this.CheckpointNumber = number; this.WaypointId = id; this.Type = CheckpointType.Normal; }
/// <summary> /// Constructor /// </summary> /// <param name="number"></param> /// <param name="id"></param> public ArbiterCheckpoint(int number, IAreaSubtypeWaypointId id, CheckpointType type) { this.CheckpointNumber = number; this.WaypointId = id; this.Type = type; }