Examples of org.apache.mina.common.ByteBuffer

org.apache.mina.common.ByteBuffer
on autoExpand (it is off by default) buf.setAutoExpand( true ); buf.putString( greeting, utf8encoder ); NIO ByteBuffer is reallocated by MINA ByteBuffer behind the scene if the encoded data is larger than 16 bytes. Its capacity will increase by two times, and its limit will increase to the last position the string is written.

Derived Buffers

Derived buffers are the buffers which were created by {@link #duplicate()}, {@link #slice()}, or {@link #asReadOnlyBuffer()}. They are useful especially when you broadcast the same messages to multiple {@link IoSession}s. Please note that the derived buffers are neither pooled nor auto-expandable. Trying to expand a derived buffer will raise {@link IllegalStateException}.

Changing Buffer Allocation and Management Policy

MINA provides a {@link ByteBufferAllocator} interface to let you overridethe default buffer management behavior. There are two allocators provided out-of-the-box:
- {@link PooledByteBufferAllocator} (Default)
- {@link SimpleByteBufferAllocator}
You can change the allocator by calling {@link #setAllocator(ByteBufferAllocator)}.
@author The Apache Directory Project (mina-dev@directory.apache.org) @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $ @noinspection StaticNonFinalField @see ByteBufferAllocator

                LineDelimiter.WINDOWS);


        CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder();
        IoSession session = new DummySession();
        TestDecoderOutput out = new TestDecoderOutput();
        ByteBuffer in = ByteBuffer.allocate(16);


        // Test one decode and one output
        in.putString("ABC\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("ABC", out.getMessageQueue().poll());


        // Test two decode and one output
        in.clear();
        in.putString("DEF", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("GHI\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("DEFGHI", out.getMessageQueue().poll());


        // Test one decode and two output
        in.clear();
        in.putString("JKL\r\nMNO\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(2, out.getMessageQueue().size());
        Assert.assertEquals("JKL", out.getMessageQueue().poll());
        Assert.assertEquals("MNO", out.getMessageQueue().poll());


        // Test splitted long delimiter
        decoder = new TextLineDecoder(Charset.forName("UTF-8"),
                new LineDelimiter("\n\n\n"));
        in.clear();
        in.putString("PQR\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("PQR", out.getMessageQueue().poll());


        // Test splitted long delimiter which produces two output
        decoder = new TextLineDecoder(Charset.forName("UTF-8"),
                new LineDelimiter("\n\n\n"));
        in.clear();
        in.putString("PQR\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\nSTU\n\n\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(2, out.getMessageQueue().size());
        Assert.assertEquals("PQR", out.getMessageQueue().poll());
        Assert.assertEquals("STU", out.getMessageQueue().poll());


        // Test splitted long delimiter mixed with partial non-delimiter.
        decoder = new TextLineDecoder(Charset.forName("UTF-8"),
                new LineDelimiter("\n\n\n"));
        in.clear();
        in.putString("PQR\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("X\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\n\nSTU\n\n\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(2, out.getMessageQueue().size());
        Assert.assertEquals("PQR\nX", out.getMessageQueue().poll());
        Assert.assertEquals("STU", out.getMessageQueue().poll());
    }

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        ProtocolEncoder encoder = new ObjectSerializationEncoder();
        encoder.encode(session, expected, out);


        Assert.assertEquals(1, out.getBufferQueue().size());
        ByteBuffer buf = out.getBufferQueue().poll();


        testDecoderAndInputStream(expected, buf);
    }

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        Zlib inflater = (Zlib) session.getAttribute(INFLATER);
        if (inflater == null) {
            throw new IllegalStateException();
        }


        ByteBuffer inBuffer = (ByteBuffer) message;
        ByteBuffer outBuffer = inflater.inflate(inBuffer);
        inBuffer.release();
        nextFilter.messageReceived(session, outBuffer);
    }

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        Zlib deflater = (Zlib) session.getAttribute(DEFLATER);
        if (deflater == null) {
            throw new IllegalStateException();
        }


        ByteBuffer inBuffer = (ByteBuffer) writeRequest.getMessage();
        if (!inBuffer.hasRemaining()) {
            // Ignore empty buffers
            nextFilter.filterWrite(session, writeRequest);
        } else {
            ByteBuffer outBuf = deflater.deflate(inBuffer);
            inBuffer.release();
            nextFilter.filterWrite(session, new WriteRequest(outBuf,
                    writeRequest.getFuture()));
        }
    }

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                LineDelimiter.AUTO);


        CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder();
        IoSession session = new DummySession();
        TestDecoderOutput out = new TestDecoderOutput();
        ByteBuffer in = ByteBuffer.allocate(16);


        // Test one decode and one output
        in.putString("ABC\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("ABC", out.getMessageQueue().poll());


        // Test two decode and one output
        in.clear();
        in.putString("DEF", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("GHI\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("DEFGHI", out.getMessageQueue().poll());


        // Test one decode and two output
        in.clear();
        in.putString("JKL\r\nMNO\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(2, out.getMessageQueue().size());
        Assert.assertEquals("JKL", out.getMessageQueue().poll());
        Assert.assertEquals("MNO", out.getMessageQueue().poll());


        // Test multiple '\n's
        in.clear();
        in.putString("\n\n\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(3, out.getMessageQueue().size());
        Assert.assertEquals("", out.getMessageQueue().poll());
        Assert.assertEquals("", out.getMessageQueue().poll());
        Assert.assertEquals("", out.getMessageQueue().poll());


        // Test splitted long delimiter (\r\r\n)
        in.clear();
        in.putString("PQR\r", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\r", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("PQR", out.getMessageQueue().poll());


        // Test splitted long delimiter (\r\r\n) which produces two output
        in.clear();
        in.putString("PQR\r", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\r", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\nSTU\r\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(2, out.getMessageQueue().size());
        Assert.assertEquals("PQR", out.getMessageQueue().poll());
        Assert.assertEquals("STU", out.getMessageQueue().poll());


        // Test splitted long delimiter mixed with partial non-delimiter.
        in.clear();
        in.putString("PQR\r", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("X\r", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        in.clear();
        in.putString("\r\nSTU\r\r\n", encoder);
        in.flip();
        decoder.decode(session, in, out);
        Assert.assertEquals(2, out.getMessageQueue().size());
        Assert.assertEquals("PQR\rX", out.getMessageQueue().poll());
        Assert.assertEquals("STU", out.getMessageQueue().poll());
    }

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        decoder.setMaxLineLength(3);


        CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder();
        IoSession session = new DummySession();
        TestDecoderOutput out = new TestDecoderOutput();
        ByteBuffer in = ByteBuffer.allocate(16);


        // Make sure the overflow exception is not thrown until
        // the delimiter is encountered.
        in.putString("A", encoder).flip().mark();
        decoder.decode(session, in.reset().mark(), out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        decoder.decode(session, in.reset().mark(), out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        decoder.decode(session, in.reset().mark(), out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        decoder.decode(session, in.reset().mark(), out);
        Assert.assertEquals(0, out.getMessageQueue().size());
        
        in.clear().putString("A\r\nB\r\n", encoder).flip();
        try {
            decoder.decode(session, in, out);
            Assert.fail();
        } catch (BufferDataException e) {
            // Success!
        }
        
        decoder.decode(session, in, out);
        Assert.assertEquals(1, out.getMessageQueue().size());
        Assert.assertEquals("B", out.getMessageQueue().poll());


        // Make sure OOM is not thrown.
        long oldFreeMemory = Runtime.getRuntime().freeMemory();
        in = ByteBuffer.allocate(1048576 * 16).mark();
        for (int i = 0; i < 10; i ++) {
            decoder.decode(session, in.reset().mark(), out);
            Assert.assertEquals(0, out.getMessageQueue().size());


            // Memory consumption should be minimal.
            Assert.assertTrue(Runtime.getRuntime().freeMemory() - oldFreeMemory < 1048576); 
        }


        in.clear().putString("C\r\nD\r\n", encoder).flip();
        try {
            decoder.decode(session, in, out);
            Assert.fail();
        } catch (BufferDataException e) {
            // Success!

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            }
        };


        encoder.encode(session, "ABC", out);
        Assert.assertEquals(1, out.getBufferQueue().size());
        ByteBuffer buf = out.getBufferQueue().poll();
        Assert.assertEquals(5, buf.remaining());
        Assert.assertEquals('A', buf.get());
        Assert.assertEquals('B', buf.get());
        Assert.assertEquals('C', buf.get());
        Assert.assertEquals('\r', buf.get());
        Assert.assertEquals('\n', buf.get());
    }

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            }
        }


        public void messageReceived( IoSession session, Object message ) throws Exception
        {
            ByteBuffer buf = ( ByteBuffer ) message;
            while( buf.hasRemaining() )
            {
                digest.update( buf.get() );
                bytesRead++;
            }
            if( bytesRead >= size )
            {
                session.close();

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  public void encode(IoSession session, Object obj, ProtocolEncoderOutput out) 
  throws Exception {
    StructMessage m = (StructMessage)obj;
    byte[] buffer = JavaStruct.pack(m);
      ByteBuffer b = ByteBuffer.allocate(buffer.length + 8, false);
      b.putInt(buffer.length + 4);
      b.putInt(m.getID());
      b.put(buffer);
      b.flip();
      out.write(b);
  }

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        if (!(message instanceof ByteBuffer)) {
            nextFilter.messageReceived(session, message);
            return;
        }


        ByteBuffer in = (ByteBuffer) message;
        ProtocolDecoder decoder = getDecoder(session);
        ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);


        try {
            synchronized (decoderOut) {
                decoder.decode(session, in, decoderOut);
            }
        } catch (Throwable t) {
            ProtocolDecoderException pde;
            if (t instanceof ProtocolDecoderException) {
                pde = (ProtocolDecoderException) t;
            } else {
                pde = new ProtocolDecoderException(t);
            }
            pde.setHexdump(in.getHexDump());
            throw pde;
        } finally {
            // Dispose the decoder if this session is connectionless.
            if (session.getTransportType().isConnectionless()) {
                disposeDecoder(session);
            }


            // Release the read buffer.
            in.release();


            decoderOut.flush();
        }
    }

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Examples of org.apache.mina.common.ByteBuffer

Derived Buffers

Changing Buffer Allocation and Management Policy

Related Classes of org.apache.mina.common.ByteBuffer