jnano

Java binding for the nanomsg library.

What is this?

This package contains a JNI-based Java binding for nanomsg, the communications and synchronization library.

How to Use

You will need the following:

1. A copy of the JDK. The binding has been tested on v1.7.0_21 running on a Windows 7 machine.

2. A copy of ant. I use v1.8.4.

3. A C compiler. I use MSVC 2010.

4. A copy of cpptasks, an ant helper that automates compilation of C code. I use v1.0b5. You can find a copy in the lib/ant directory; therefore, you can run ant with ant -lib lib/ant/cpptasks-1.0b5.jar jar to use the included cpptasks.

5. Look at the build.<OS>.properties file for your OS. Pay particular attention to the value of dir.jni.headers.

Once your environment is set up and you have downloaded jnano, you can do any of these:

• ant jar -- create all JARs.

• ant test -- run all unit tests (none for now).

• ant run -- run a specific class in one of the JARs, such as Tester. See below.

• ant perf -- run performance tests. See below.

To run a basic tester class, run this on a command window:

ant -Dcn=org.nanomsg.Tester run

To run the latency performance test for inproc sockets, run this on a command window:

ant -Dcn=org.nanomsg.inproc_lat -Dargs="1 100000" perf

To run the throughput performance test for inproc sockets, run this on a command window:

ant -Dcn=org.nanomsg.inproc_thr -Dargs="100 100000" perf

To run the latency performance test for TCP sockets, run this on two separate command windows:

ant -Dcn=org.nanomsg.local_lat -Dargs="tcp://127.0.0.1:6789 1 100000" perf ant -Dcn=org.nanomsg.remote_lat -Dargs="tcp://127.0.0.1:6789 1 100000" perf

To run the throughput performance test for TCP sockets, run this on two separate command windows:

ant -Dcn=org.nanomsg.local_thr -Dargs="tcp://127.0.0.1:6789 100 100000" perf ant -Dcn=org.nanomsg.remote_thr -Dargs="tcp://127.0.0.1:6789 100 100000" perf

Status

This is a work in progress.

Everything works pretty well and performance is comparable to what you get on C.

I am still looking for the right way to integrate the polling support provided by nanomsg into the native Java way of doing demultiplexing.

License

This project is released under the MIT license, as is the native libnanomsg library. See COPYING for more details.