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 testSweepWithZeros() throws Exception {
        IoBuffer buf = IoBuffer.allocate(4);
        buf.putInt(0xdeadbeef);
        buf.clear();
        assertEquals(0xdeadbeef, buf.getInt());
        assertEquals(4, buf.position());
        assertEquals(4, buf.limit());


        buf.sweep();
        assertEquals(0, buf.position());
        assertEquals(4, buf.limit());
        assertEquals(0x0, buf.getInt());
    }

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    }




    @Test
    public void testSweepNonZeros() throws Exception {
        IoBuffer buf = IoBuffer.allocate(4);
        buf.putInt(0xdeadbeef);
        buf.clear();
        assertEquals(0xdeadbeef, buf.getInt());
        assertEquals(4, buf.position());
        assertEquals(4, buf.limit());


        buf.sweep((byte) 0x45);
        assertEquals(0, buf.position());
        assertEquals(4, buf.limit());
        assertEquals(0x45454545, buf.getInt());
    }

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    public void testWrapNioBuffer() throws Exception {
        ByteBuffer nioBuf = ByteBuffer.allocate(10);
        nioBuf.position(3);
        nioBuf.limit(7);


        IoBuffer buf = IoBuffer.wrap(nioBuf);
        assertEquals(3, buf.position());
        assertEquals(7, buf.limit());
        assertEquals(10, buf.capacity());
    }

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    @Test
    public void testWrapSubArray() throws Exception {
        byte[] array = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };


        IoBuffer buf = IoBuffer.wrap(array, 3, 4);
        assertEquals(3, buf.position());
        assertEquals(7, buf.limit());
        assertEquals(10, buf.capacity());


        buf.clear();
        assertEquals(0, buf.position());
        assertEquals(10, buf.limit());
        assertEquals(10, buf.capacity());
    }

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    }




    @Test
    public void testDuplicate() throws Exception {
        IoBuffer original;
        IoBuffer duplicate;


        // Test if the buffer is duplicated correctly.
        original = IoBuffer.allocate(16).sweep();
        original.position(4);
        original.limit(10);
        duplicate = original.duplicate();
        original.put(4, (byte) 127);
        assertEquals(4, duplicate.position());
        assertEquals(10, duplicate.limit());
        assertEquals(16, duplicate.capacity());
        assertNotSame(original.buf(), duplicate.buf());
        assertSame(original.buf().array(), duplicate.buf().array());
        assertEquals(127, duplicate.get(4));


        // Test a duplicate of a duplicate.
        original = IoBuffer.allocate(16);
        duplicate = original.duplicate().duplicate();
        assertNotSame(original.buf(), duplicate.buf());
        assertSame(original.buf().array(), duplicate.buf().array());


        // Try to expand.
        original = IoBuffer.allocate(16);
        original.setAutoExpand(true);
        duplicate = original.duplicate();
        assertFalse(original.isAutoExpand());


        try {
            original.setAutoExpand(true);
            fail("Derived buffers and their parent can't be expanded");
        }
        catch (IllegalStateException e) {
            // Expected an Exception, signifies test success
            assertTrue(true);
        }


        try {
            duplicate.setAutoExpand(true);
            fail("Derived buffers and their parent can't be expanded");
        }
        catch (IllegalStateException e) {
            // Expected an Exception, signifies test success
            assertTrue(true);

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    }




    @Test
    public void testSlice() throws Exception {
        IoBuffer original;
        IoBuffer slice;


        // Test if the buffer is sliced correctly.
        original = IoBuffer.allocate(16).sweep();
        original.position(4);
        original.limit(10);
        slice = original.slice();
        original.put(4, (byte) 127);
        assertEquals(0, slice.position());
        assertEquals(6, slice.limit());
        assertEquals(6, slice.capacity());
        assertNotSame(original.buf(), slice.buf());
        assertEquals(127, slice.get(0));
    }

View Full Code Here

    }




    @Test
    public void testReadOnlyBuffer() throws Exception {
        IoBuffer original;
        IoBuffer duplicate;


        // Test if the buffer is duplicated correctly.
        original = IoBuffer.allocate(16).sweep();
        original.position(4);
        original.limit(10);
        duplicate = original.asReadOnlyBuffer();
        original.put(4, (byte) 127);
        assertEquals(4, duplicate.position());
        assertEquals(10, duplicate.limit());
        assertEquals(16, duplicate.capacity());
        assertNotSame(original.buf(), duplicate.buf());
        assertEquals(127, duplicate.get(4));


        // Try to expand.
        try {
            original = IoBuffer.allocate(16);
            duplicate = original.asReadOnlyBuffer();
            duplicate.putString("A very very very very looooooong string", Charset.forName("ISO-8859-1").newEncoder());
            fail("ReadOnly buffer's can't be expanded");
        }
        catch (ReadOnlyBufferException e) {
            // Expected an Exception, signifies test success
            assertTrue(true);

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    }




    @Test
    public void testGetUnsigned() throws Exception {
        IoBuffer buf = IoBuffer.allocate(16);
        buf.put((byte) 0xA4);
        buf.put((byte) 0xD0);
        buf.put((byte) 0xB3);
        buf.put((byte) 0xCD);
        buf.flip();


        buf.order(ByteOrder.LITTLE_ENDIAN);


        buf.mark();
        assertEquals(0xA4, buf.getUnsigned());
        buf.reset();
        assertEquals(0xD0A4, buf.getUnsignedShort());
        buf.reset();
        assertEquals(0xCDB3D0A4L, buf.getUnsignedInt());
    }

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    @Test
    public void testIndexOf() throws Exception {
        boolean direct = false;
        for (int i = 0; i < 2; i++, direct = !direct) {
            IoBuffer buf = IoBuffer.allocate(16, direct);
            buf.put((byte) 0x1);
            buf.put((byte) 0x2);
            buf.put((byte) 0x3);
            buf.put((byte) 0x4);
            buf.put((byte) 0x1);
            buf.put((byte) 0x2);
            buf.put((byte) 0x3);
            buf.put((byte) 0x4);
            buf.position(2);
            buf.limit(5);


            assertEquals(4, buf.indexOf((byte) 0x1));
            assertEquals(-1, buf.indexOf((byte) 0x2));
            assertEquals(2, buf.indexOf((byte) 0x3));
            assertEquals(3, buf.indexOf((byte) 0x4));
        }
    }

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    }




    @Test
    public void testPutEnumSet() {
        IoBuffer buf = IoBuffer.allocate(8);


        // Test empty set
        buf.putEnumSet(EnumSet.noneOf(TestEnum.class));
        buf.flip();
        assertEquals(0, buf.get());


        buf.clear();
        buf.putEnumSetShort(EnumSet.noneOf(TestEnum.class));
        buf.flip();
        assertEquals(0, buf.getShort());


        buf.clear();
        buf.putEnumSetInt(EnumSet.noneOf(TestEnum.class));
        buf.flip();
        assertEquals(0, buf.getInt());


        buf.clear();
        buf.putEnumSetLong(EnumSet.noneOf(TestEnum.class));
        buf.flip();
        assertEquals(0, buf.getLong());


        // Test complete set
        buf.clear();
        buf.putEnumSet(EnumSet.range(TestEnum.E1, TestEnum.E8));
        buf.flip();
        assertEquals((byte) -1, buf.get());


        buf.clear();
        buf.putEnumSetShort(EnumSet.range(TestEnum.E1, TestEnum.E16));
        buf.flip();
        assertEquals((short) -1, buf.getShort());


        buf.clear();
        buf.putEnumSetInt(EnumSet.range(TestEnum.E1, TestEnum.E32));
        buf.flip();
        assertEquals(-1, buf.getInt());


        buf.clear();
        buf.putEnumSetLong(EnumSet.allOf(TestEnum.class));
        buf.flip();
        assertEquals(-1L, buf.getLong());


        // Test high bit set
        buf.clear();
        buf.putEnumSet(EnumSet.of(TestEnum.E8));
        buf.flip();
        assertEquals(Byte.MIN_VALUE, buf.get());


        buf.clear();
        buf.putEnumSetShort(EnumSet.of(TestEnum.E16));
        buf.flip();
        assertEquals(Short.MIN_VALUE, buf.getShort());


        buf.clear();
        buf.putEnumSetInt(EnumSet.of(TestEnum.E32));
        buf.flip();
        assertEquals(Integer.MIN_VALUE, buf.getInt());


        buf.clear();
        buf.putEnumSetLong(EnumSet.of(TestEnum.E64));
        buf.flip();
        assertEquals(Long.MIN_VALUE, buf.getLong());


        // Test high low bits set
        buf.clear();
        buf.putEnumSet(EnumSet.of(TestEnum.E1, TestEnum.E8));
        buf.flip();
        assertEquals(Byte.MIN_VALUE + 1, buf.get());


        buf.clear();
        buf.putEnumSetShort(EnumSet.of(TestEnum.E1, TestEnum.E16));
        buf.flip();
        assertEquals(Short.MIN_VALUE + 1, buf.getShort());


        buf.clear();
        buf.putEnumSetInt(EnumSet.of(TestEnum.E1, TestEnum.E32));
        buf.flip();
        assertEquals(Integer.MIN_VALUE + 1, buf.getInt());


        buf.clear();
        buf.putEnumSetLong(EnumSet.of(TestEnum.E1, TestEnum.E64));
        buf.flip();
        assertEquals(Long.MIN_VALUE + 1, buf.getLong());
    }

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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