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//------------------------------------------------------------------------------
// <copyright file="StatePersistenceService.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System;
using System.IO;
using System.IO.Compression;
using System.Workflow.Runtime;
using System.Workflow.ComponentModel;
using System.Diagnostics;
namespace System.Workflow.Runtime.Hosting
{
/// <summary> Service for saving engine state. </summary>
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public abstract class WorkflowPersistenceService : WorkflowRuntimeService
{
/// <summary> Saves the state of a workflow instance. </summary>
/// <param name="state"> The workflow instance state to save </param>
internal protected abstract void SaveWorkflowInstanceState(Activity rootActivity, bool unlock);
/// <summary></summary>
/// <param name="state"></param>
internal protected abstract void UnlockWorkflowInstanceState(Activity rootActivity);
/// <summary> Loads the state of a workflow instance. </summary>
/// <param name="instanceId"> The unique ID of the instance to load </param>
/// <returns> The workflow instance state</returns>
internal protected abstract Activity LoadWorkflowInstanceState(Guid instanceId);
/// <summary> Saves the state of a completed scope. </summary>
/// <param name="completedScopeState"> The completed scope to save </param>
internal protected abstract void SaveCompletedContextActivity(Activity activity);
/// <summary> Loads the state of a completed scope </summary>
/// <param name="scopeId"> The unique identifier of the completed scope </param>
/// <returns> The completed scope or null </returns>
internal protected abstract Activity LoadCompletedContextActivity(Guid scopeId, Activity outerActivity);
/// <summary></summary>
/// <param name="activity"></param>
/// <returns>The value of the "UnloadOnIdle" flag</returns>
internal protected abstract bool UnloadOnIdle(Activity activity);
static protected byte[] GetDefaultSerializedForm(Activity activity)
{
DateTime startTime = DateTime.Now;
Byte[] result;
Debug.Assert(activity != null, "Null activity");
using (MemoryStream stream = new MemoryStream(10240))
{
stream.Position = 0;
activity.Save(stream);
using (MemoryStream compressedStream = new MemoryStream((int)stream.Length))
{
using (GZipStream gzs = new GZipStream(compressedStream, CompressionMode.Compress, true))
{
gzs.Write(stream.GetBuffer(), 0, (int)stream.Length);
}
ActivityExecutionContextInfo executionContextInfo = (ActivityExecutionContextInfo)activity.GetValue(Activity.ActivityExecutionContextInfoProperty);
TimeSpan timeElapsed = DateTime.Now - startTime;
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0,
"Serialized a {0} with id {1} to length {2}. Took {3}.",
executionContextInfo, executionContextInfo.ContextGuid, compressedStream.Length, timeElapsed);
result = compressedStream.GetBuffer();
Array.Resize<Byte>(ref result, Convert.ToInt32(compressedStream.Length));
}
}
return result;
}
static protected Activity RestoreFromDefaultSerializedForm(Byte[] activityBytes, Activity outerActivity)
{
DateTime startTime = DateTime.Now;
Activity state;
MemoryStream stream = new MemoryStream(activityBytes);
stream.Position = 0;
using (GZipStream gzs = new GZipStream(stream, CompressionMode.Decompress, true))
{
state = Activity.Load(gzs, outerActivity);
}
Debug.Assert(state != null, "invalid state recovered");
TimeSpan timeElapsed = DateTime.Now - startTime;
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0,
"Deserialized a {0} to length {1}. Took {2}.",
state, stream.Length, timeElapsed);
return state;
}
static protected internal bool GetIsBlocked(Activity rootActivity)
{
return (bool)rootActivity.GetValue(WorkflowExecutor.IsBlockedProperty);
}
static protected internal string GetSuspendOrTerminateInfo(Activity rootActivity)
{
return (string)rootActivity.GetValue(WorkflowExecutor.SuspendOrTerminateInfoProperty);
}
static protected internal WorkflowStatus GetWorkflowStatus(Activity rootActivity)
{
return (WorkflowStatus)rootActivity.GetValue(WorkflowExecutor.WorkflowStatusProperty);
}
}
}
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