Examples of com.google.code.yanf4j.buffer.IoBuffer

com.google.code.yanf4j.buffer.IoBuffer
cate heap buffer by default. IoBuffer.setUseDirectBuffer(false); // A new heap buffer is returned. IoBuffer buf = IoBuffer.allocate(1024);

Wrapping existing NIO buffers and arrays

This class provides a few wrap(...) methods that wraps any NIO buffers and byte arrays.
AutoExpand

Writing variable-length data using NIO ByteBuffers is not really easy, and it is because its size is fixed. {@link IoBuffer} introducesautoExpand property. If autoExpand property is true, you never get {@link BufferOverflowException} or{@link IndexOutOfBoundsException} (except when index is negative). Itautomatically expands its capacity and limit value. For example:
```
 String greeting = messageBundle.getMessage("hello"); IoBuffer buf = IoBuffer.allocate(16); // Turn on autoExpand (it is off by default) buf.setAutoExpand(true); buf.putString(greeting, utf8encoder); 
```
The underlying {@link ByteBuffer} is reallocated by {@link IoBuffer} behindthe scene if the encoded data is larger than 16 bytes in the example above. Its capacity will double, and its limit will increase to the last position the string is written.

AutoShrink

You might also want to decrease the capacity of the buffer when most of the allocated memory area is not being used. {@link IoBuffer} providesautoShrink property to take care of this issue. If autoShrink is turned on, {@link IoBuffer} halves the capacity of thebuffer when {@link #compact()} is invoked and only 1/4 or less of the currentcapacity is being used.
You can also {@link #shrink()} method manually to shrink the capacity of thebuffer.
The underlying {@link ByteBuffer} is reallocated by {@link IoBuffer} behindthe scene, and therefore {@link #buf()} will return a different{@link ByteBuffer} instance once capacity changes. Please also note{@link #compact()} or {@link #shrink()} will not decrease the capacity if thenew capacity is less than the {@link #minimumCapacity()} of the buffer.
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 buffer derived from and its derived buffers are not both auto-expandable neither auto-shrinkable. Trying to call {@link #setAutoExpand(boolean)} or {@link #setAutoShrink(boolean)} withtrue parameter will raise an {@link IllegalStateException}.

Changing Buffer Allocation Policy

{@link IoBufferAllocator} interface lets you override the default buffermanagement behavior. There are two allocators provided out-of-the-box:
- {@link SimpleBufferAllocator} (default)
- {@link CachedBufferAllocator}
You can implement your own allocator and use it by calling {@link #setAllocator(IoBufferAllocator)}.
@author The Apache MINA Project (dev@mina.apache.org) @version $Rev: 748525 $, $Date: 2009-02-27 14:45:31 +0100 (Fri, 27 Feb 2009)$

    }




    @Test
    public void testGetPrefixedString() throws Exception {
        IoBuffer buf = IoBuffer.allocate(16);
        CharsetEncoder encoder;
        CharsetDecoder decoder;
        encoder = Charset.forName("ISO-8859-1").newEncoder();
        decoder = Charset.forName("ISO-8859-1").newDecoder();


        buf.putShort((short) 3);
        buf.putString("ABCD", encoder);
        buf.clear();
        assertEquals("ABC", buf.getPrefixedString(decoder));
    }

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    @Test
    public void testEncodeNormal() throws Exception {
        Encoder encoder = this.codecFactory.getEncoder();
        Assert.assertNotNull(encoder);
        IoBuffer buffer = encoder.encode(IoBuffer.wrap("hello".getBytes("utf-8")), null);
        Assert.assertNotNull(buffer);
        Assert.assertTrue(buffer.hasRemaining());
        Assert.assertArrayEquals("hello".getBytes("utf-8"), buffer.array());


    }

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    @Test
    public void decodeNormal() throws Exception {
        Encoder encoder = this.codecFactory.getEncoder();
        Assert.assertNotNull(encoder);
        IoBuffer buffer = encoder.encode(IoBuffer.wrap("hello".getBytes("utf-8")), null);


        IoBuffer decodeBuffer = (IoBuffer) this.codecFactory.getDecoder().decode(buffer, null);
        Assert.assertEquals(IoBuffer.wrap("hello".getBytes("utf-8")), decodeBuffer);
    }

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    @Test
    public void testDirectEncoder() throws Exception {
        this.codecFactory = new ByteBufferCodecFactory(true);
        IoBuffer msg = IoBuffer.allocate(100);
        IoBuffer buffer = this.codecFactory.getEncoder().encode(msg, null);
        Assert.assertTrue(buffer.isDirect());
    }

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    @Test
    public void testPutPrefixedString() throws Exception {
        CharsetEncoder encoder;
        IoBuffer buf = IoBuffer.allocate(16);
        buf.fillAndReset(buf.remaining());
        encoder = Charset.forName("ISO-8859-1").newEncoder();


        // Without autoExpand
        buf.putPrefixedString("ABC", encoder);
        assertEquals(5, buf.position());
        assertEquals(0, buf.get(0));
        assertEquals(3, buf.get(1));
        assertEquals('A', buf.get(2));
        assertEquals('B', buf.get(3));
        assertEquals('C', buf.get(4));


        buf.clear();
        try {
            buf.putPrefixedString("123456789012345", encoder);
            fail();
        }
        catch (BufferOverflowException e) {
            // Expected an Exception, signifies test success
            assertTrue(true);
        }


        // With autoExpand
        buf.clear();
        buf.setAutoExpand(true);
        buf.putPrefixedString("123456789012345", encoder);
        assertEquals(17, buf.position());
        assertEquals(0, buf.get(0));
        assertEquals(15, buf.get(1));
        assertEquals('1', buf.get(2));
        assertEquals('2', buf.get(3));
        assertEquals('3', buf.get(4));
        assertEquals('4', buf.get(5));
        assertEquals('5', buf.get(6));
        assertEquals('6', buf.get(7));
        assertEquals('7', buf.get(8));
        assertEquals('8', buf.get(9));
        assertEquals('9', buf.get(10));
        assertEquals('0', buf.get(11));
        assertEquals('1', buf.get(12));
        assertEquals('2', buf.get(13));
        assertEquals('3', buf.get(14));
        assertEquals('4', buf.get(15));
        assertEquals('5', buf.get(16));
    }

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    @Test
    public void testPutPrefixedStringWithPrefixLength() throws Exception {
        CharsetEncoder encoder = Charset.forName("ISO-8859-1").newEncoder();
        IoBuffer buf = IoBuffer.allocate(16).sweep().setAutoExpand(true);


        buf.putPrefixedString("A", 1, encoder);
        assertEquals(2, buf.position());
        assertEquals(1, buf.get(0));
        assertEquals('A', buf.get(1));


        buf.sweep();
        buf.putPrefixedString("A", 2, encoder);
        assertEquals(3, buf.position());
        assertEquals(0, buf.get(0));
        assertEquals(1, buf.get(1));
        assertEquals('A', buf.get(2));


        buf.sweep();
        buf.putPrefixedString("A", 4, encoder);
        assertEquals(5, buf.position());
        assertEquals(0, buf.get(0));
        assertEquals(0, buf.get(1));
        assertEquals(0, buf.get(2));
        assertEquals(1, buf.get(3));
        assertEquals('A', buf.get(4));
    }

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    @Test
    public void testPutPrefixedStringWithPadding() throws Exception {
        CharsetEncoder encoder = Charset.forName("ISO-8859-1").newEncoder();
        IoBuffer buf = IoBuffer.allocate(16).sweep().setAutoExpand(true);


        buf.putPrefixedString("A", 1, 2, (byte) 32, encoder);
        assertEquals(3, buf.position());
        assertEquals(2, buf.get(0));
        assertEquals('A', buf.get(1));
        assertEquals(' ', buf.get(2));


        buf.sweep();
        buf.putPrefixedString("A", 1, 4, (byte) 32, encoder);
        assertEquals(5, buf.position());
        assertEquals(4, buf.get(0));
        assertEquals('A', buf.get(1));
        assertEquals(' ', buf.get(2));
        assertEquals(' ', buf.get(3));
        assertEquals(' ', buf.get(4));
    }

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    @Test
    public void testWideUtf8Characters() throws Exception {
        Runnable r = new Runnable() {
            public void run() {
                IoBuffer buffer = IoBuffer.allocate(1);
                buffer.setAutoExpand(true);


                Charset charset = Charset.forName("UTF-8");


                CharsetEncoder encoder = charset.newEncoder();


                for (int i = 0; i < 5; i++) {
                    try {
                        buffer.putString("\u89d2", encoder);
                        buffer.putPrefixedString("\u89d2", encoder);
                    }
                    catch (CharacterCodingException e) {
                        fail(e.getMessage());
                    }
                }

View Full Code Here

    }




    @Test
    public void testObjectSerialization() throws Exception {
        IoBuffer buf = IoBuffer.allocate(16);
        buf.setAutoExpand(true);
        List<Object> o = new ArrayList<Object>();
        o.add(new Date());
        o.add(long.class);


        // Test writing an object.
        buf.putObject(o);


        // Test reading an object.
        buf.clear();
        Object o2 = buf.getObject();
        assertEquals(o, o2);


        // This assertion is just to make sure that deserialization occurred.
        assertNotSame(o, o2);
    }

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    }




    @Test
    public void testInheritedObjectSerialization() throws Exception {
        IoBuffer buf = IoBuffer.allocate(16);
        buf.setAutoExpand(true);


        Bar expected = new Bar();
        expected.setFooValue(0x12345678);
        expected.setBarValue(0x90ABCDEF);


        // Test writing an object.
        buf.putObject(expected);


        // Test reading an object.
        buf.clear();
        Bar actual = (Bar) buf.getObject();
        assertSame(Bar.class, actual.getClass());
        assertEquals(expected.getFooValue(), actual.getFooValue());
        assertEquals(expected.getBarValue(), actual.getBarValue());


        // This assertion is just to make sure that deserialization occurred.

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Examples of com.google.code.yanf4j.buffer.IoBuffer

Wrapping existing NIO buffers and arrays

AutoExpand

AutoShrink

Derived Buffers

Changing Buffer Allocation Policy

Related Classes of com.google.code.yanf4j.buffer.IoBuffer