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From "Christoph Engelbert (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DIRECTMEMORY-49) MemoryManagerService.update does not reuse the same pointer
Date Mon, 05 Nov 2012 22:04:13 GMT

     [ https://issues.apache.org/jira/browse/DIRECTMEMORY-49?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christoph Engelbert resolved DIRECTMEMORY-49.
---------------------------------------------

    Resolution: Fixed
    
> MemoryManagerService.update does not reuse the same pointer
> -----------------------------------------------------------
>
>                 Key: DIRECTMEMORY-49
>                 URL: https://issues.apache.org/jira/browse/DIRECTMEMORY-49
>             Project: Apache DirectMemory
>          Issue Type: Bug
>            Reporter: Benoit Perroud
>            Assignee: Christoph Engelbert
>            Priority: Minor
>             Fix For: 0.2
>
>
> MemoryManagerService.update actually free and store again the payload, which leads to
another pointer allocation. This is fine in lots of case, but when the buffer is full, we
still want the update to succeed.
> Moreover, update should throw an exception (BufferOverFlowException for example) when
the new payload data is bigger than the previous.
> Considering the following test, where I allocate just enough space for 1 object, I store
it, and then want to update it content. I could hope this use case succeed, but it's actually
not the case
> {code}
> @Test
> public void testOffHeapMemoryBufferUpdate() {
> 		
> 	final int NUMBER_OF_OBJECTS = 1;
> 	final int BUFFER_SIZE = NUMBER_OF_OBJECTS * 4; // allocate 4 bytes
> 	
> 	final OffHeapMemoryBuffer offHeapMemoryBuffer = OffHeapMemoryBufferImpl.createNew(BUFFER_SIZE);
>         // generate 4 random bytes, store, read back and assert
> 	final byte[] payload = generateRandomPayload(4);
> 	final Pointer pointer = offHeapMemoryBuffer.store(payload);
> 	Assert.assertNotNull(pointer);
> 	Assert.assertEquals(new String(payload), new String(offHeapMemoryBuffer.retrieve(pointer)));
> 	
>         // generate another payload, update it, read it and assert.
> 	byte[] otherPayload = generateRandomPayload(4);
> 	final Pointer otherPointer = offHeapMemoryBuffer.update(pointer, otherPayload);
> 	Assert.assertNotNull(otherPointer);
> 	Assert.assertEquals(new String(otherPayload), new String(offHeapMemoryBuffer.retrieve(otherPointer)));
> }
> {code}

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