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TransactionalStorage.cs
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TransactionalStorage.cs
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//-----------------------------------------------------------------------
// <copyright file="TransactionalStorage.cs" company="Hibernating Rhinos LTD">
// Copyright (c) Hibernating Rhinos LTD. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.IO;
using System.Threading;
using Newtonsoft.Json.Linq;
using Raven.Abstractions;
using Raven.Abstractions.Data;
using Raven.Abstractions.MEF;
using Raven.Database;
using Raven.Database.Config;
using Raven.Database.Impl;
using Raven.Database.Plugins;
using Raven.Database.Storage;
using Raven.Munin;
using Raven.Storage.Managed.Backup;
using Raven.Storage.Managed.Impl;
namespace Raven.Storage.Managed
{
public class TransactionalStorage : ITransactionalStorage
{
private readonly ThreadLocal<IStorageActionsAccessor> current = new ThreadLocal<IStorageActionsAccessor>();
private readonly InMemoryRavenConfiguration configuration;
private readonly Action onCommit;
private TableStorage tableStroage;
public TableStorage TableStroage
{
get { return tableStroage; }
}
private IPersistentSource persistenceSource;
private volatile bool disposed;
private readonly ReaderWriterLockSlim disposerLock = new ReaderWriterLockSlim();
private Timer idleTimer;
private long lastUsageTime;
private IUuidGenerator uuidGenerator;
private readonly IDocumentCacher documentCacher;
public IPersistentSource PersistenceSource
{
get { return persistenceSource; }
}
[ImportMany]
public OrderedPartCollection<AbstractDocumentCodec> DocumentCodecs { get; set; }
public TransactionalStorage(InMemoryRavenConfiguration configuration, Action onCommit)
{
this.configuration = configuration;
this.onCommit = onCommit;
documentCacher = new DocumentCacher(configuration);
}
public void Dispose()
{
disposerLock.EnterWriteLock();
try
{
if (disposed)
return;
disposed = true;
current.Dispose();
if (documentCacher != null)
documentCacher.Dispose();
if (idleTimer != null)
idleTimer.Dispose();
if (persistenceSource != null)
persistenceSource.Dispose();
if(tableStroage != null)
tableStroage.Dispose();
}
finally
{
disposerLock.ExitWriteLock();
}
}
public Guid Id
{
get; private set;
}
[DebuggerNonUserCode]
public void Batch(Action<IStorageActionsAccessor> action)
{
if (disposerLock.IsReadLockHeld) // we are currently in a nested Batch call
{
if (current.Value != null) // check again, just to be sure
{
action(current.Value);
return;
}
}
disposerLock.EnterReadLock();
try
{
if (disposed)
{
Trace.WriteLine("TransactionalStorage.Batch was called after it was disposed, call was ignored.");
return; // this may happen if someone is calling us from the finalizer thread, so we can't even throw on that
}
Interlocked.Exchange(ref lastUsageTime, SystemTime.Now.ToBinary());
using (tableStroage.BeginTransaction())
{
var storageActionsAccessor = new StorageActionsAccessor(tableStroage, uuidGenerator, DocumentCodecs, documentCacher);
current.Value = storageActionsAccessor;
action(current.Value);
storageActionsAccessor.SaveAllTasks();
tableStroage.Commit();
storageActionsAccessor.InvokeOnCommit();
}
}
finally
{
disposerLock.ExitReadLock();
if(disposed ==false)
current.Value = null;
}
onCommit(); // call user code after we exit the lock
}
public void ExecuteImmediatelyOrRegisterForSyncronization(Action action)
{
if (current.Value == null)
{
action();
return;
}
current.Value.OnCommit += action;
}
public bool Initialize(IUuidGenerator generator)
{
uuidGenerator = generator;
if (configuration.RunInMemory == false && Directory.Exists(configuration.DataDirectory) == false)
Directory.CreateDirectory(configuration.DataDirectory);
persistenceSource = configuration.RunInMemory
? (IPersistentSource)new MemoryPersistentSource()
: new FileBasedPersistentSource(configuration.DataDirectory, "Raven", configuration.TransactionMode == TransactionMode.Safe);
tableStroage = new TableStorage(persistenceSource);
idleTimer = new Timer(MaybeOnIdle, null, TimeSpan.FromSeconds(30), TimeSpan.FromSeconds(30));
tableStroage.Initialze();
if(persistenceSource.CreatedNew)
{
Id = Guid.NewGuid();
Batch(accessor => tableStroage.Details.Put("id", Id.ToByteArray()));
}
else
{
var readResult = tableStroage.Details.Read("id");
Id = new Guid(readResult.Data());
}
return persistenceSource.CreatedNew;
}
public void StartBackupOperation(DocumentDatabase database, string backupDestinationDirectory, bool incrementalBackup)
{
var backupOperation = new BackupOperation(database, persistenceSource, database.Configuration.DataDirectory, backupDestinationDirectory);
ThreadPool.QueueUserWorkItem(backupOperation.Execute);
}
public void Restore(string backupLocation, string databaseLocation)
{
new RestoreOperation(backupLocation, databaseLocation).Execute();
}
public long GetDatabaseSizeInBytes()
{
return PersistenceSource.Read(stream => stream.Length);
}
public string FriendlyName
{
get { return "Munin"; }
}
public bool HandleException(Exception exception)
{
return false;
}
private void MaybeOnIdle(object _)
{
var ticks = Interlocked.Read(ref lastUsageTime);
var lastUsage = DateTime.FromBinary(ticks);
if ((SystemTime.Now - lastUsage).TotalSeconds < 30)
return;
tableStroage.PerformIdleTasks();
}
public void EnsureCapacity(int value)
{
persistenceSource.EnsureCapacity(value);
}
}
}