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Project JMongo The Mongo project provides native bindings for most popular languages. For the ruby language, the project has a pure ruby execution path and a C extension to handle some of the heavy lifting. Unfortunately, the performance of the pure ruby path under jruby is less than stellar. Additionally, the C extension isn't compatible with jruby so we aren't able to take advantage of any native code boost. JMongo solves this problem by putting a thin ruby wrapper around the 10gen mongo-java-driver. The goal is to provide a drop-in replacement for the mongo and bson gems along with complete API compatibility. The repo was was forked from Chuck Remes's (now deleted) repo. INSTALLATION (from Rubygems.org) % gem install jmongo USAGE * Use jruby with 1.9 compatibility turned on JRUBY_OPTS='--1.9' PROGRESS Almost all of the Ruby driver API is implemented The the Ruby driver tests have been brought over and converted to be MiniTest based and the collection and cursor test suites pass. NOTE: a few (2/3) tests have been skipped, you should look at them to see if they affect you. The Mongoid rspec functional suite runs 2607 examples with 28 failures when using JMongo My Mongoid repo was forked after this commit (so newer funtionality/specs will be missing) commit 6cc97092bc10535b8b65647a3d14b10ca1b94c8c Author: Bernerd Schaefer <firstname.lastname@example.org> Date: Tue Jun 28 12:59:34 2011 +0200 The failures are classed in this way: * Different Exception class being raised for BSON invalid keys * Managing Replica Sets directly * Managing Connection Pools directly * XML serialization * Ruby RegExp to BSON encode and decode (FIXED) I will fix these problems in due course Please note that the java driver handles the Replica Sets and connection pools If you are using Replica Sets and want to use JMongo you should be OK if you use a URI to connect. JMongo lets the Java driver handle reading from slaves and writing to master, although YMMV as I have not tested JMongo with Replica Sets yet. If you intend to use the fsync=true uri option to imply safe=true on your queries, at the moment you will also need to specify the w option in the uri. e.g. mongodb://0.0.0.0:27017/?fsync=true;w=1; 2011-10-18 I have added non-blocking support to the Cursor if it is tailable and bound to a Capped Collection. This is to have similar behaviour to the ruby driver as far as test expectations. The unblocking behaviour is achieved by inserting a "poison doc" into the capped collection in a timeout thread. In the Cursor.new options hash if you set await_data to hash, float or true it will not block on cursor.next. a value of true will use the defaults, a value of float will set the timeout whaile a hash will allow you to control the timeout as well as your own poison doc and the poison doc equality (lambda/proc) mechanism. The default timeout is 0.125 seconds.