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StalenessStorageActions.cs
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StalenessStorageActions.cs
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//-----------------------------------------------------------------------
// <copyright file="StalenessStorageActions.cs" company="Hibernating Rhinos LTD">
// Copyright (c) Hibernating Rhinos LTD. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Linq;
using Raven.Abstractions.Extensions;
using Raven.Database.Exceptions;
using Raven.Database.Indexing;
using Raven.Database.Storage;
using Raven.Json.Linq;
using Raven.Munin;
using Raven.Storage.Managed.Impl;
namespace Raven.Storage.Managed
{
public class StalenessStorageActions : IStalenessStorageActions
{
private readonly TableStorage storage;
public StalenessStorageActions(TableStorage storage)
{
this.storage = storage;
}
public bool IsIndexStale(string name, DateTime? cutOff, Guid? cutoffEtag)
{
var readResult = storage.IndexingStats.Read(name);
if (readResult == null)
return false;// index does not exists
if (IsMapStale(name) || IsReduceStale(name))
{
if (cutOff != null)
{
var lastIndexedTime = readResult.Key.Value<DateTime>("lastTimestamp");
if (cutOff.Value >= lastIndexedTime)
return true;
var lastReducedTime = readResult.Key.Value<DateTime?>("lastReducedTimestamp");
if (lastReducedTime != null && cutOff.Value >= lastReducedTime.Value)
return true;
}
else if (cutoffEtag != null)
{
var lastIndexedEtag = readResult.Key.Value<byte[]>("lastEtag");
if (Buffers.Compare(lastIndexedEtag, cutoffEtag.Value.ToByteArray()) < 0)
return true;
}
else
{
return true;
}
}
var tasksAfterCutoffPoint = storage.Tasks["ByIndexAndTime"].SkipTo(new RavenJObject{{"index", name}});
if (cutOff != null)
tasksAfterCutoffPoint = tasksAfterCutoffPoint
.Where(x => x.Value<DateTime>("time") < cutOff.Value);
return tasksAfterCutoffPoint.Any();
}
public bool IsReduceStale(string name)
{
var readResult = storage.IndexingStats.Read(name);
if (readResult == null)
return false;// index does not exists
var lastReducedEtag = readResult.Key.Value<byte[]>("lastReducedEtag") ;
var mostRecentReducedEtag = GetMostRecentReducedEtag(name);
if (mostRecentReducedEtag == null)
return false;// there are no mapped results, maybe there are documents to be indexed, not stale
if (lastReducedEtag == null)
return true; // first reduce did not happen
return Buffers.Compare(mostRecentReducedEtag.Value.ToByteArray(), lastReducedEtag) > 0;
}
public bool IsMapStale(string name)
{
var readResult = storage.IndexingStats.Read(name);
if (readResult == null)
return false;// index does not exists
var lastIndexedEtag = readResult.Key.Value<byte[]>("lastEtag");
return storage.Documents["ByEtag"].SkipFromEnd(0)
.Select(doc => doc.Value<byte[]>("etag"))
.Select(docEtag => Buffers.Compare(docEtag, lastIndexedEtag) > 0)
.FirstOrDefault();
}
public Tuple<DateTime,Guid> IndexLastUpdatedAt(string name)
{
var readResult = storage.IndexingStats.Read(name);
if (readResult == null)
throw new IndexDoesNotExistsException("Could not find index named: " + name);
return Tuple.Create(
readResult.Key.Value<DateTime>("lastTimestamp"),
new Guid(readResult.Key.Value<byte[]>("lastEtag"))
);
}
public int GetIndexTouchCount(string name)
{
var readResult = storage.IndexingStats.Read(name);
if (readResult == null)
throw new IndexDoesNotExistsException("Could not find index named: " + name);
return readResult.Key.Value<int>("touches");
}
public Guid GetMostRecentDocumentEtag()
{
foreach (var doc in storage.Documents["ByEtag"].SkipFromEnd(0))
{
var docEtag = doc.Value<byte[]>("etag");
return new Guid(docEtag);
}
return Guid.Empty;
}
public Guid? GetMostRecentReducedEtag(string name)
{
var keyWithHighestEqualTo = storage.MappedResults["ByViewAndEtag"]
.GreatestEqual(new RavenJObject {{"view", name}}, token => token.Value<string>("view") == name);
if(keyWithHighestEqualTo == null)
return null;
return new Guid(keyWithHighestEqualTo.Value<byte[]>("etag"));
}
}
}