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// Copyright 2008 Louis DeJardin - http://whereslou.com
//
// Licensed 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.
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using Spark.Caching;
using Spark.Spool;
using Spark.Utilities;
namespace Spark
{
public class SparkViewContext
{
public SparkViewContext()
{
Content = new Dictionary<string, TextWriter>();
Globals = new Dictionary<string, object>();
OnceTable = new Dictionary<string, string>();
}
public TextWriter Output { get; set; }
public Dictionary<string, TextWriter> Content { get; set; }
public Dictionary<string, object> Globals { get; set; }
public Dictionary<string, string> OnceTable { get; set; }
}
public abstract class SparkViewBase : ISparkView
{
private SparkViewContext _sparkViewContext;
public abstract Guid GeneratedViewId { get; }
public virtual bool TryGetViewData(string name, out object value)
{
value = null;
return false;
}
public virtual SparkViewContext SparkViewContext
{
get
{
return _sparkViewContext ??
Interlocked.CompareExchange(ref _sparkViewContext, new SparkViewContext(), null) ??
_sparkViewContext;
}
set { _sparkViewContext = value; }
}
public TextWriter Output { get { return SparkViewContext.Output; } set { SparkViewContext.Output = value; } }
public Dictionary<string, TextWriter> Content { get { return SparkViewContext.Content; } set { SparkViewContext.Content = value; } }
public Dictionary<string, object> Globals { get { return SparkViewContext.Globals; } set { SparkViewContext.Globals = value; } }
public Dictionary<string, string> OnceTable { get { return SparkViewContext.OnceTable; } set { SparkViewContext.OnceTable = value; } }
public IDisposable OutputScope(string name)
{
TextWriter writer;
if (!Content.TryGetValue(name, out writer))
{
writer = new SpoolWriter();
Content.Add(name, writer);
}
return new OutputScopeImpl(this, writer);
}
public IDisposable OutputScope(TextWriter writer)
{
return new OutputScopeImpl(this, writer);
}
public IDisposable OutputScope()
{
return new OutputScopeImpl(this, new SpoolWriter());
}
public bool Once(object flag)
{
var flagString = Convert.ToString(flag);
if (SparkViewContext.OnceTable.ContainsKey(flagString))
return false;
SparkViewContext.OnceTable.Add(flagString, null);
return true;
}
public class OutputScopeImpl : IDisposable
{
private readonly SparkViewBase view;
private readonly TextWriter previous;
public OutputScopeImpl(SparkViewBase view, TextWriter writer)
{
this.view = view;
previous = view.Output;
view.Output = writer;
}
public void Dispose()
{
view.Output = previous;
}
}
protected bool BeginCachedContent(string site, CacheExpires expires, params object[] key)
{
_currentCacheScope = new CacheScopeImpl(this, CacheUtilities.ToIdentifier(site, key), expires);
if (_currentCacheScope.Begin())
return true;
EndCachedContent();
return false;
}
protected void EndCachedContent()
{
_currentCacheScope = _currentCacheScope.End(null);
}
protected void EndCachedContent(ICacheSignal signal)
{
_currentCacheScope = _currentCacheScope.End(signal);
}
private CacheScopeImpl _currentCacheScope;
public ICacheService CacheService { get; set; }
private class CacheScopeImpl
{
private readonly CacheScopeImpl _previousCacheScope;
private readonly ICacheService _cacheService;
private readonly CacheOriginator _originator;
private readonly string _identifier;
private readonly CacheExpires _expires;
private bool _recording;
private static readonly ICacheService _nullCacheService = new NullCacheService();
public CacheScopeImpl(SparkViewBase view, string identifier, CacheExpires expires)
{
_identifier = identifier;
_expires = expires;
_previousCacheScope = view._currentCacheScope;
_cacheService = view.CacheService ?? _nullCacheService;
_originator = new CacheOriginator(view.SparkViewContext);
}
public bool Begin()
{
var memento = _cacheService.Get(_identifier) as CacheMemento;
if (memento == null)
{
_recording = true;
_originator.BeginMemento();
}
else
{
_recording = false;
_originator.DoMemento(memento);
}
return _recording;
}
public CacheScopeImpl End(ICacheSignal signal)
{
if (_recording)
{
var memento = _originator.EndMemento();
_cacheService.Store(_identifier, _expires, signal, memento);
}
return _previousCacheScope;
}
private class NullCacheService : ICacheService
{
public object Get(string identifier)
{
return null;
}
public void Store(string identifier, CacheExpires expires, ICacheSignal signal, object item)
{
}
}
}
public virtual void RenderView(TextWriter writer)
{
using (OutputScope(writer))
{
Render();
}
}
public abstract void Render();
}
}
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