Blosc/JBlosc

Java interface for Blosc library

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JBlosc: A Java interface for Blosc

JBlosc is a Java seamless interface for C-Blosc. A simple example extracted from the unit tests:

int SIZE = 100 * 100 * 100;
ByteBuffer ibb = ByteBuffer.allocateDirect(SIZE * PrimitiveSizes.DOUBLE_FIELD_SIZE);
for (int i = 0; i < SIZE; i++) {
    ibb.putDouble(i);
}
JBlosc jb = new JBlosc();
ByteBuffer obb = ByteBuffer.allocateDirect(ibb.limit() + JBlosc.OVERHEAD);
jb.compress(5, Shuffle.BYTE_SHUFFLE, PrimitiveSizes.DOUBLE_FIELD_SIZE, ibb, ibb.limit(), obb, obb.limit());
ByteBuffer abb = ByteBuffer.allocateDirect(ibb.limit());
jb.decompress(obb, abb, abb.limit());
jb.destroy();
assertEquals(ibb, abb);

JBlosc is fast. See benchmaks here.

Installation

Installing C-Blosc

First of all, you need to install the C-Blosc library. In short, if you already have CMake and a C compiler in your system, executing the following commands should do the work:

cd c-blosc
mkdir build
cd build
cmake ..   # Add -DCMAKE_GENERATOR_PLATFORM=x64 for Win64 platforms
cmake --build . --target install

In Linux/Unix the Blosc library is typically installed in your system search path. However, on Windows you will need to copy the blosc.dll somewhere in your PATH (e.g. copy "c:\Program Files (x86)\blosc\lib\blosc.dll" c:\Windows\System32).

Also check that your OS, Java Virtual Machine and Blosc library are all using the same architecture (either 32 or 64 bit).

Installing JBlosc

After cloning the repo, move into the inner jblosc directory and build, test and install the package:

mvn clean install

If you want to use it in another Maven project, after installing JBlosc you can use it as a dependency like this:

    <dependencies>
        <dependency>
            <groupId>org.blosc</groupId>
            <artifactId>jblosc</artifactId>
            <version>JBLOSC_VERSION</version>
        </dependency>
    </dependencies>

Replace the JBLOSC_VERSION placeholder by the desired version.