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${ noResults }
1 Commits (7df17e57d4e736336de6b95810daf076e9b7dded)
Author | SHA1 | Message | Date |
---|---|---|---|
Shawn O. Pearce | de8946c0c2 |
Store Git on any DHT
jgit.storage.dht is a storage provider implementation for JGit that permits storing the Git repository in a distributed hashtable, NoSQL system, or other database. The actual underlying storage system is undefined, and can be plugged in by implementing 7 small interfaces: * Database * RepositoryIndexTable * RepositoryTable * RefTable * ChunkTable * ObjectIndexTable * WriteBuffer The storage provider interface tries to assume very little about the underlying storage system, and requires only three key features: * key -> value lookup (a hashtable is suitable) * atomic updates on single rows * asynchronous operations (Java's ExecutorService is easy to use) Most NoSQL database products offer all 3 of these features in their clients, and so does any decent network based cache system like the open source memcache product. Relying only on key equality for data retrevial makes it simple for the storage engine to distribute across multiple machines. Traditional SQL systems could also be used with a JDBC based spi implementation. Before submitting this change I have implemented six storage systems for the spi layer: * Apache HBase[1] * Apache Cassandra[2] * Google Bigtable[3] * an in-memory implementation for unit testing * a JDBC implementation for SQL * a generic cache provider that can ride on top of memcache All six systems came in with an spi layer around 1000 lines of code to implement the above 7 interfaces. This is a huge reduction in size compared to prior attempts to implement a new JGit storage layer. As this package shows, a complete JGit storage implementation is more than 17,000 lines of fairly complex code. A simple cache is provided in storage.dht.spi.cache. Implementers can use CacheDatabase to wrap any other type of Database and perform fast reads against a network based cache service, such as the open source memcached[4]. An implementation of CacheService must be provided to glue this spi onto the network cache. [1] https://github.com/spearce/jgit_hbase [2] https://github.com/spearce/jgit_cassandra [3] http://labs.google.com/papers/bigtable.html [4] http://memcached.org/ Change-Id: I0aa4072781f5ccc019ca421c036adff2c40c4295 Signed-off-by: Shawn O. Pearce <spearce@spearce.org> |
14 years ago |
Shawn O. Pearce | 5e33a1de83 |
Simple dumb HTTP server for Git
This is a simple HTTP server that provides the minimum server side support required for dumb (non-git aware) transport clients. We produce the info/refs and objects/info/packs file on the fly from the local repository state, but otherwise serve data as raw files from the on-disk structure. In the future we could better optimize the FileSender class and the servlets that use it to take advantage of direct file to network APIs in more advanced servlet containers like Jetty. Our glue package borrows the idea of a micro embedded DSL from Google Guice and uses it to configure a collection of Filters and HttpServlets, all of which are matched against requests using regular expressions. If a subgroup exists in the pattern, it is extracted and used for the path info component of the request. Change-Id: Ia0f1a425d07d035e344ae54faf8aeb04763e7487 Signed-off-by: Shawn O. Pearce <spearce@spearce.org> |
15 years ago |
Git Development Community | 1a6964c827 |
Initial JGit contribution to eclipse.org
Per CQ 3448 this is the initial contribution of the JGit project to eclipse.org. It is derived from the historical JGit repository at commit 3a2dd9921c8a08740a9e02c421469e5b1a9e47cb. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> |
15 years ago |