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//------------------------------------------------------------------------------
// <copyright file="PartitionResolver.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web {
using System;
using System.Configuration;
using System.Collections;
using System.Threading;
using System.IO;
using System.Web;
using System.Web.Caching;
using System.Web.Util;
using System.Data;
using System.Data.SqlClient;
using System.Text;
using System.Security.Principal;
using System.Xml;
using System.Collections.Specialized;
using System.Configuration.Provider;
using System.Globalization;
using System.Web.Management;
using System.Web.Hosting;
using System.Web.Configuration;
using System.Security.Permissions;
public interface IPartitionResolver {
void Initialize();
string ResolvePartition(Object key);
}
internal interface IPartitionInfo {
string GetTracingPartitionString();
}
internal delegate IPartitionInfo CreatePartitionInfo(string connectionString);
class PartitionManager : IDisposable {
internal PartitionManager(CreatePartitionInfo createCallback) {
_createCallback = createCallback;
}
HybridDictionary _partitions = new HybridDictionary();
ReaderWriterLock _lock = new ReaderWriterLock();
CreatePartitionInfo _createCallback;
internal object GetPartition(IPartitionResolver partitionResolver, string id) {
if (EtwTrace.IsTraceEnabled(EtwTraceLevel.Verbose, EtwTraceFlags.Infrastructure))
EtwTrace.Trace(EtwTraceType.ETW_TYPE_SESSIONSTATE_PARTITION_START, HttpContext.Current.WorkerRequest, partitionResolver.GetType().FullName, id);
string partitionString = null;
string errorMessage = null;
IPartitionInfo partitionInfo = null;
try {
try {
partitionString = partitionResolver.ResolvePartition(id);
if (partitionString == null) {
throw new HttpException(
SR.GetString(SR.Bad_partition_resolver_connection_string, partitionResolver.GetType().FullName));
}
}
catch (Exception e) {
errorMessage = e.Message;
throw;
}
try {
_lock.AcquireReaderLock(-1);
partitionInfo = (IPartitionInfo)_partitions[partitionString];
if (partitionInfo != null) {
Debug.Trace("PartitionManager", "id=" + id + "; partitionString=" + partitionString);
return partitionInfo;
}
}
finally {
if (_lock.IsReaderLockHeld) {
_lock.ReleaseReaderLock();
}
}
// Not found. Has to add it.
try {
_lock.AcquireWriterLock(-1);
// One more time
partitionInfo = (IPartitionInfo)_partitions[partitionString];
if (partitionInfo == null) {
partitionInfo = _createCallback(partitionString);
Debug.Trace("PartitionManager", "Add a new partition; id=" + id + "; partitionString=" + partitionString);
_partitions.Add(partitionString, partitionInfo);
}
Debug.Trace("PartitionManager", "id=" + id + "; partitionString=" + partitionString);
return partitionInfo;
}
finally {
if (_lock.IsWriterLockHeld) {
_lock.ReleaseWriterLock();
}
}
}
finally {
if (EtwTrace.IsTraceEnabled(EtwTraceLevel.Verbose, EtwTraceFlags.Infrastructure)) {
string msg = errorMessage;
if (msg == null) {
if (partitionInfo != null) {
msg = partitionInfo.GetTracingPartitionString();
}
else {
msg = String.Empty;
}
}
EtwTrace.Trace(EtwTraceType.ETW_TYPE_SESSIONSTATE_PARTITION_END, HttpContext.Current.WorkerRequest, msg);
}
}
}
public void Dispose() {
if (_partitions == null) {
return;
}
try {
_lock.AcquireWriterLock(-1);
if (_partitions != null) {
foreach (PartitionInfo partitionInfo in _partitions.Values) {
partitionInfo.Dispose();
}
_partitions = null;
}
}
catch {
// ignore exceptions in dispose
}
finally {
if (_lock.IsWriterLockHeld) {
_lock.ReleaseWriterLock();
}
}
}
}
internal class PartitionInfo : IDisposable, IPartitionInfo {
ResourcePool _rpool;
internal PartitionInfo(ResourcePool rpool) {
_rpool = rpool;
}
internal object RetrieveResource() {
return _rpool.RetrieveResource();
}
internal void StoreResource(IDisposable o) {
_rpool.StoreResource(o);
}
protected virtual string TracingPartitionString {
get {
return String.Empty;
}
}
string IPartitionInfo.GetTracingPartitionString() {
return TracingPartitionString;
}
public void Dispose() {
if (_rpool == null) {
return;
}
lock (this) {
if (_rpool != null) {
_rpool.Dispose();
_rpool = null;
}
}
}
};
}
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