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DocumentsStorageActions.cs
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DocumentsStorageActions.cs
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//-----------------------------------------------------------------------
// <copyright file="DocumentsStorageActions.cs" company="Hibernating Rhinos LTD">
// Copyright (c) Hibernating Rhinos LTD. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using Raven.Abstractions;
using Raven.Abstractions.Data;
using Raven.Abstractions.Exceptions;
using Raven.Abstractions.Extensions;
using Raven.Abstractions.MEF;
using Raven.Database;
using Raven.Database.Impl;
using Raven.Database.Json;
using Raven.Database.Plugins;
using Raven.Database.Storage;
using Raven.Json.Linq;
using Raven.Storage.Managed.Impl;
using System.Linq;
namespace Raven.Storage.Managed
{
public class DocumentsStorageActions : IDocumentStorageActions
{
private readonly TableStorage storage;
private readonly ITransactionStorageActions transactionStorageActions;
private readonly IUuidGenerator generator;
private readonly OrderedPartCollection<AbstractDocumentCodec> documentCodecs;
private readonly IDocumentCacher documentCacher;
public DocumentsStorageActions(TableStorage storage,
ITransactionStorageActions transactionStorageActions,
IUuidGenerator generator,
OrderedPartCollection<AbstractDocumentCodec> documentCodecs,
IDocumentCacher documentCacher)
{
this.storage = storage;
this.transactionStorageActions = transactionStorageActions;
this.generator = generator;
this.documentCodecs = documentCodecs;
this.documentCacher = documentCacher;
}
public Tuple<int, int> FirstAndLastDocumentIds()
{
var lastOrDefault = storage.Documents["ById"].LastOrDefault();
var last = 0;
if (lastOrDefault != null)
last = lastOrDefault.Value<int>("id");
var firstOrDefault = storage.Documents["ById"].FirstOrDefault();
var first = 0;
if (firstOrDefault != null)
first= firstOrDefault.Value<int>("id");
return new Tuple<int, int>(first,last );
}
public IEnumerable<JsonDocument> GetDocumentsByReverseUpdateOrder(int start, int take)
{
return storage.Documents["ByEtag"].SkipFromEnd(start)
.Select(result => DocumentByKey(result.Value<string>("key"), null))
.Take(take);
}
public IEnumerable<JsonDocument> GetDocumentsAfter(Guid etag, int take)
{
return storage.Documents["ByEtag"].SkipAfter(new RavenJObject{{"etag", etag.ToByteArray()}})
.Select(result => DocumentByKey(result.Value<string>("key"), null))
.Take(take);
}
public IEnumerable<JsonDocument> GetDocumentsWithIdStartingWith(string idPrefix, int start, int take)
{
return storage.Documents["ByKey"].SkipTo(new RavenJObject{{"key", idPrefix }})
.Skip(start)
.TakeWhile(x => x.Value<string>("key").StartsWith(idPrefix))
.Select(result => DocumentByKey(result.Value<string>("key"), null))
.Take(take);
}
public long GetDocumentsCount()
{
return storage.Documents["ByKey"].Count;
}
public JsonDocument DocumentByKey(string key, TransactionInformation transactionInformation)
{
return DocumentByKeyInternal(key, transactionInformation, (tuple, metadata) => new JsonDocument
{
SerializedSizeOnDisk = tuple.Item3,
Metadata = metadata.Metadata,
Etag = metadata.Etag,
Key = metadata.Key,
LastModified = metadata.LastModified,
NonAuthoritativeInformation = metadata.NonAuthoritativeInformation,
DataAsJson = ReadDocument(tuple, metadata)
});
}
public JsonDocumentMetadata DocumentMetadataByKey(string key, TransactionInformation transactionInformation)
{
return DocumentByKeyInternal(key, transactionInformation, (stream, metadata) => metadata);
}
private T DocumentByKeyInternal<T>(string key, TransactionInformation transactionInformation, Func<Tuple<MemoryStream, RavenJObject, int>, JsonDocumentMetadata, T> createResult)
where T : class
{
RavenJObject metadata;
var resultInTx = storage.DocumentsModifiedByTransactions.Read(new RavenJObject { { "key", key } });
if (transactionInformation != null && resultInTx != null)
{
if(new Guid(resultInTx.Key.Value<byte[]>("txId")) == transactionInformation.Id)
{
if (resultInTx.Key.Value<bool>("deleted"))
return null;
var txEtag = new Guid(resultInTx.Key.Value<byte[]>("etag"));
var resultTx = ReadMetadata(key, txEtag, resultInTx.Data, out metadata);
return createResult(resultTx, new JsonDocumentMetadata
{
Key = key,
Etag = txEtag,
Metadata = metadata,
LastModified = resultInTx.Key.Value<DateTime>("modified"),
});
}
}
var readResult = storage.Documents.Read(new RavenJObject { { "key", key } });
if (readResult == null)
{
if(resultInTx != null)
{
return createResult(Tuple.Create<MemoryStream,RavenJObject, int>(null, new RavenJObject(), 0), new JsonDocumentMetadata
{
Key = key,
Etag = Guid.Empty,
Metadata = new RavenJObject { { Constants.RavenDocumentDoesNotExists, true } },
NonAuthoritativeInformation = true,
LastModified = DateTime.MinValue
});
}
return null;
}
var etag = new Guid(readResult.Key.Value<byte[]>("etag"));
var result = ReadMetadata(key, etag, readResult.Data, out metadata);
return createResult(result, new JsonDocumentMetadata
{
Key = key,
Etag = etag,
Metadata = metadata,
LastModified = readResult.Key.Value<DateTime>("modified"),
NonAuthoritativeInformation = resultInTx != null
});
}
private Tuple<MemoryStream, RavenJObject, int> ReadMetadata(string key, Guid etag, Func<byte[]> getData, out RavenJObject metadata)
{
var cachedDocument = documentCacher.GetCachedDocument(key, etag);
if (cachedDocument != null)
{
metadata = cachedDocument.Metadata;
return Tuple.Create<MemoryStream, RavenJObject,int>(null, cachedDocument.Document, cachedDocument.Size);
}
var buffer = getData();
var memoryStream = new MemoryStream(buffer, 0, buffer.Length, true , true);
metadata = memoryStream.ToJObject();
return Tuple.Create<MemoryStream, RavenJObject, int>(memoryStream, null, (int)memoryStream.Length);
}
private RavenJObject ReadDocument(Tuple<MemoryStream, RavenJObject, int> stream, JsonDocumentMetadata metadata)
{
if (stream.Item2 != null)
return stream.Item2;
RavenJObject result;
Stream docDataStream = stream.Item1;
if (documentCodecs.Count() > 0)
{
var metadataCopy = (RavenJObject)metadata.Metadata.CloneToken() ;
using (docDataStream = documentCodecs.Aggregate(docDataStream, (dataStream, codec) => codec.Value.Decode(metadata.Key, metadataCopy, dataStream)))
result = docDataStream.ToJObject();
}
else
{
result = docDataStream.ToJObject();
}
Debug.Assert(metadata.Etag != null);
documentCacher.SetCachedDocument(metadata.Key, metadata.Etag.Value, result, metadata.Metadata, stream.Item3);
return result;
}
public bool DeleteDocument(string key, Guid? etag, out RavenJObject metadata)
{
var existingEtag = AssertValidEtag(key, etag, "DELETE", null);
metadata = null;
var readResult = storage.Documents.Read(new RavenJObject { { "key", key } });
if (readResult == null)
return false;
metadata = readResult.Data().ToJObject();
storage.Documents.Remove(new RavenJObject { { "key", key } });
documentCacher.RemoveCachedDocument(key, existingEtag);
return true;
}
public Guid AddDocument(string key, Guid? etag, RavenJObject data, RavenJObject metadata)
{
var existingEtag = AssertValidEtag(key, etag, "PUT", null);
var ms = new MemoryStream();
metadata.WriteTo(ms);
using (var stream = documentCodecs.Aggregate<Lazy<AbstractDocumentCodec>, Stream>(ms, (dataStream, codec) => codec.Value.Encode(key, data, metadata, dataStream)))
{
data.WriteTo(stream);
stream.Flush();
}
var newEtag = generator.CreateSequentialUuid();
storage.Documents.Put(new RavenJObject
{
{"key", key},
{"etag", newEtag.ToByteArray()},
{"modified", SystemTime.UtcNow},
{"id", GetNextDocumentId()},
{"entityName", metadata.Value<string>(Constants.RavenEntityName)}
}, ms.ToArray());
documentCacher.RemoveCachedDocument(key, existingEtag);
return newEtag;
}
private int lastGeneratedId;
private int GetNextDocumentId()
{
if (lastGeneratedId > 0)
return ++lastGeneratedId;
var lastOrefaultKeyById = storage.Documents["ById"].LastOrDefault();
int id = 1;
if (lastOrefaultKeyById != null)
id = lastOrefaultKeyById.Value<int>("id") + 1;
lastGeneratedId = id;
return id;
}
private Guid AssertValidEtag(string key, Guid? etag, string op, TransactionInformation transactionInformation)
{
var readResult = storage.Documents.Read(new RavenJObject { { "key", key } });
if (readResult != null)
{
StorageHelper.AssertNotModifiedByAnotherTransaction(storage, transactionStorageActions, key, readResult, transactionInformation);
var existingEtag = new Guid(readResult.Key.Value<byte[]>("etag"));
if (etag != null)
{
if (existingEtag != etag)
{
if(etag.Value == Guid.Empty)
{
RavenJObject metadata;
ReadMetadata(key, existingEtag, readResult.Data, out metadata);
if (metadata.ContainsKey(Constants.RavenDeleteMarker) && metadata.Value<bool>(Constants.RavenDeleteMarker))
{
return existingEtag;
}
}
throw new ConcurrencyException(op + " attempted on document '" + key +
"' using a non current etag")
{
ActualETag = etag.Value,
ExpectedETag = existingEtag
};
}
}
return existingEtag;
}
readResult = storage.DocumentsModifiedByTransactions.Read(new RavenJObject { { "key", key } });
StorageHelper.AssertNotModifiedByAnotherTransaction(storage, transactionStorageActions, key, readResult, transactionInformation);
if(readResult == null)
return Guid.Empty;
return new Guid(readResult.Key.Value<byte[]>("etag"));
}
}
}