Examples of com.hp.hpl.jena.tdb.base.file.BufferChannel

com.hp.hpl.jena.tdb.base.file.BufferChannel
Interface to storage : a simplified version of FileChannel. Read and write bytes, passed via ByteBuffers, addressed by file location. Not suitable for memory mapped I/O - no allocation from the I/O resource but instead reads into storage provided outside and writes from storage provided outside. Does not insert size of ByteBuffer - size of ByteBuffer passed to read controls the number of bytes read. Having our own abstraction enables us to implement memory-backed versions. @see BlockAccess @see FileChannel

        return FileOps.exists(journalFilename(location)) ;
    }
    
    public static Journal create(Location location)
    {
        BufferChannel chan ;
        if ( location.isMem() )
            chan = BufferChannelMem.create() ;
        else
            chan = new BufferChannelFile(journalFilename(location)) ;
        return new Journal(chan) ;

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                blkMgr.overwrite(blk) ; 
                return true ;
            }   
            case Buffer:
            {
                BufferChannel chan = dsg.getConfig().bufferChannels.get(e.getFileRef()) ;
                ByteBuffer bb = e.getByteBuffer() ;
                log.debug("Replay: {} {}",e.getFileRef(), bb) ;
                chan.write(bb, 0) ; // YUK!
                return true ;
            }
                
            case Commit:
                return false ;

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    @Override
    protected ObjectFile make()
    {
        FileOps.deleteSilent(filename) ;
        BufferChannel chan = BufferChannelFile.create(filename) ;
        // No buffering.
        return new ObjectFileStorage(chan, -1) ;
    }

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public class TestObjectFileBuffering extends BaseTest
{
    protected ObjectFile make(int bufferSize)
    {
        BufferChannel chan = BufferChannelMem.create() ;
        return new ObjectFileStorage(chan, bufferSize) ;
    }

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        return FileOps.exists(journalFilename(location)) ;
    }
    
    public static Journal create(Location location)
    {
        BufferChannel chan ;
        if ( location.isMem() )
            chan = BufferChannelMem.create() ;
        else
            chan = BufferChannelFile.create(journalFilename(location)) ;
        return new Journal(chan) ;

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    static FileRef testRef2 = FileRef.create("TEST2") ;
    
    Journal journal ;
    @Before public void before()
    {
        BufferChannel mem = BufferChannelMem.create("journal") ;
        journal = new Journal(mem) ;
        bb1.clear() ;
        bb2.clear() ;
        bb3.clear() ;
    }

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Related Classes of com.hp.hpl.jena.tdb.base.file.BufferChannel

com.hp.hpl.jena.tdb.base.objectfile.TestObjectFileBuffering

com.hp.hpl.jena.tdb.base.objectfile.TestObjectFileDisk

com.hp.hpl.jena.tdb.transaction.Journal

com.hp.hpl.jena.tdb.transaction.JournalControl

com.hp.hpl.jena.tdb.transaction.TestJournal

com.hp.hpl.jena.tdb.transaction.TestObjectFileTransStorage

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