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RavenDB - An Introduction

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28 Apr 2010CPOL7 min read 260.3K   2.7K   112  
An introduction to RavenDB - a new open source .NET document database using .NET 4.0 and VS 2010
using System;
using log4net;
using Raven.Database.Extensions;
using Raven.Database.Indexing;
using Raven.Database.Json;

namespace Raven.Database.Tasks
{
	public class IndexDocumentTask : Task
	{
		private readonly ILog logger = LogManager.GetLogger(typeof (IndexDocumentTask));
		public string Key { get; set; }

		public override string ToString()
		{
			return string.Format("IndexDocumentTask - Key: {0}", Key);
		}

		public override void Execute(WorkContext context)
		{
			context.TransactionaStorage.Batch(actions =>
			{
				var doc = actions.DocumentByKey(Key, null);
				if (doc == null)
				{
					actions.Commit();
					return;
				}

				var json = JsonToExpando.Convert(doc.ToJson());

				foreach (var index in context.IndexDefinitionStorage.IndexNames)
				{
					var viewGenerator = context.IndexDefinitionStorage.GetViewGenerator(index);
					if (viewGenerator == null)
						continue; // index was deleted, probably
					try
					{
						logger.DebugFormat("Indexing document: '{0}' for index: {1}", doc.Key, index);

						var failureRate = actions.GetFailureRate(index);
						if (failureRate.IsInvalidIndex)
						{
							logger.InfoFormat("Skipped indexing document: '{0}' for index: {1} because failure rate is too high: {2}",
							                  doc.Key, index,
							                  failureRate.FailureRate);
							continue;
						}


						context.IndexStorage.Index(index, viewGenerator, new[] {json,},
						                           context, actions);
					}
					catch (Exception e)
					{
						logger.WarnFormat(e, "Failed to index document '{0}' for index: {1}", doc.Key, index);
					}
				}
				actions.Commit();
			});
		}
	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
United States United States
I've been a software developer since 1996 and have enjoyed C# since 2003. I have a Bachelor's degree in Computer Science and for some reason, a Master's degree in Business Administration. I currently do software development contracting/consulting.

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