/** Test we can create an Buffer, then modify the direct bytes in native code. */
@Test
public void testCanDirectlyModifyNativeBytes() {
byte buffer[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
Buffer buf = Buffer.make(null, buffer, 0, buffer.length);
assertNotNull(buf);
assertEquals(buf.getBufferSize(), buffer.length);
// this give us the native bytes
java.nio.ByteBuffer nativeBytes = buf.getByteBuffer(0, buffer.length);
assertNotNull(nativeBytes);
for (int i = 0; i < buffer.length; i++) {
nativeBytes.put(i, (byte) (9 - buffer[i])); // reverse the order of the integers
}
// we can release it. no "update" method should be required. It should
// have modified the underlying C++ bytes.
nativeBytes = null;
// now, get a copy of the bytes in the Buffer and make sure
// the order of bytes was reversed.
byte outBuffer[] = buf.getByteArray(0, buffer.length);
assertNotNull(outBuffer);
assertEquals(outBuffer.length, buffer.length);
assertNotSame(buf, outBuffer);
for (int i = 0; i < buffer.length; i++) {
assertEquals(9 - buffer[i], outBuffer[i]);
}
}
/**
* This method allocates one large Buffer and then repeatedly creates a java.nio.ByteBuffer to
* access them
*
* <p>If the system is not leaking, the garbage collector will ensure we don't run out of heap
* space. If we're leaking, bad things will occur.
*/
@Test
public void testNoLeakingMemoryOnDirectAccess() {
Buffer buf = Buffer.make(null, 1024 * 1024); // 1 MB
assertNotNull(buf);
for (int i = 0; i < 100000; i++) {
java.nio.ByteBuffer nativeBytes = buf.getByteBuffer(0, buf.getBufferSize());
// and we do nothing with the outBytes
assertEquals(nativeBytes.limit(), buf.getBufferSize());
nativeBytes = null;
}
}
/**
* This test makes sure that Humble Video sets the byte order of the returned ByteBuffer to native
* order
*/
@Test
public void testByteOrderIsCorrect() {
Buffer buf = Buffer.make(null, 1024 * 1024); // 1 MB
assertNotNull(buf);
assertEquals(1, buf.getCurrentRefCount());
java.nio.ByteBuffer jbuf = buf.getByteBuffer(0, buf.getBufferSize());
assertNotNull(buf);
// Set 4 bytes that have a pattern that is reversible. On a big
// endian machine this is FOO and on a little endian it's BAR
jbuf.put(0, (byte) 0xFF);
jbuf.put(1, (byte) 0);
jbuf.put(2, (byte) 0xFF);
jbuf.put(3, (byte) 0);
int bigOrderVal = 0xFF00FF00;
int littleOrderVal = 0x00FF00FF;
int expectedVal;
if (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN) expectedVal = bigOrderVal;
else expectedVal = littleOrderVal;
java.nio.IntBuffer ibuf = jbuf.asIntBuffer();
assertNotNull(ibuf);
int val = ibuf.get(0);
assertEquals(expectedVal, val);
// now let's try changing byte orders
jbuf.order(ByteOrder.BIG_ENDIAN);
ibuf = jbuf.asIntBuffer();
assertNotNull(ibuf);
val = ibuf.get(0);
assertEquals(bigOrderVal, val);
jbuf.order(ByteOrder.LITTLE_ENDIAN);
ibuf = jbuf.asIntBuffer();
assertNotNull(ibuf);
val = ibuf.get(0);
assertEquals(littleOrderVal, val);
}
/**
* This is a crazy test to make sure that a direct byte buffer will still be accessible even if
* the Buffer it came from goes out of scope and is collected.
*/
@Test(timeout = 60 * 1000)
public void testDirectByteBufferCanBeAccessedAfterBufferDisappears() {
Buffer buf = Buffer.make(null, 1024 * 1024); // 1 MB
assertNotNull(buf);
assertEquals(1, buf.getCurrentRefCount());
java.nio.ByteBuffer jbuf = buf.getByteBuffer(0, buf.getBufferSize());
assertNotNull(buf);
// now release the reference
buf.delete();
buf = null;
// in versions prior to 1.22, this would have caused a hard
// crash, but with 1.22 the getByteBuffer should have incremented
// the native ref count until this java ByteBuffer gets collected
// and we do a JNIMemoryManager gc.
jbuf.put(0, (byte) 0xFF);
}