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QueueStorageActions.cs
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QueueStorageActions.cs
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//-----------------------------------------------------------------------
// <copyright file="QueueStorageActions.cs" company="Hibernating Rhinos LTD">
// Copyright (c) Hibernating Rhinos LTD. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using Raven.Database.Impl;
using Raven.Database.Storage;
using Raven.Json.Linq;
using Raven.Storage.Managed.Impl;
using System.Linq;
namespace Raven.Storage.Managed
{
public class QueueStorageActions : IQueueStorageActions
{
private readonly TableStorage storage;
private readonly IUuidGenerator generator;
public QueueStorageActions(TableStorage storage, IUuidGenerator generator)
{
this.storage = storage;
this.generator = generator;
}
public void EnqueueToQueue(string name, byte[] data)
{
storage.Queues.Put(new RavenJObject
{
{"name", name},
{"id", generator.CreateSequentialUuid().ToByteArray()},
{"reads", 0}
}, data);
}
public IEnumerable<Tuple<byte[], object>> PeekFromQueue(string name)
{
foreach (var queuedMsgKey in storage.Queues["ByName"].SkipTo(new RavenJObject
{
{"name", name}
}).TakeWhile(x=> StringComparer.InvariantCultureIgnoreCase.Equals(x.Value<string>("name"), name)))
{
var readResult = storage.Queues.Read(queuedMsgKey);
if(readResult == null)
yield break;
if (readResult.Key.Value<int>("reads") > 5) // // read too much, probably poison message, remove it
{
storage.Queues.Remove(readResult.Key);
continue;
}
((RavenJObject)readResult.Key)["reads"] = readResult.Key.Value<int>("reads") + 1;
storage.Queues.UpdateKey(readResult.Key);
yield return new Tuple<byte[], object>(
readResult.Data(),
readResult.Key.Value<byte[]>("id")
);
}
}
public void DeleteFromQueue(string name, object id)
{
storage.Queues.Remove(new RavenJObject
{
{"name", name},
{"id", (byte[])id}
});
}
}
}