Ensure that the ByteBufferBsonOutput releases all on close

JAVA-2460

Author: rozza

driver-core/src/main/com/mongodb/connection/ByteBufBsonDocument.java

@@ -75,7 +75,8 @@ static ByteBufBsonDocument createOne(final ByteBufferBsonOutput bsonOutput, fina
     }
 
     static List<ByteBufBsonDocument> create(final ByteBufferBsonOutput bsonOutput, final int startPosition) {
-        CompositeByteBuf outputByteBuf = new CompositeByteBuf(bsonOutput.getByteBuffers());
+        List<ByteBuf> duplicateByteBuffers = bsonOutput.getByteBuffers();
+        CompositeByteBuf outputByteBuf = new CompositeByteBuf(duplicateByteBuffers);
         outputByteBuf.position(startPosition);
         List<ByteBufBsonDocument> documents = new ArrayList<ByteBufBsonDocument>();
         int curDocumentStartPosition = startPosition;
@@ -88,7 +89,9 @@ static List<ByteBufBsonDocument> create(final ByteBufferBsonOutput bsonOutput, f
             curDocumentStartPosition += documentSizeInBytes;
             outputByteBuf.position(outputByteBuf.position() + documentSizeInBytes - 4);
         }
-
+        for (ByteBuf byteBuffer : duplicateByteBuffers) {
+            byteBuffer.release();
+        }
         return documents;
     }
 

driver-core/src/main/com/mongodb/connection/CompositeByteBuf.java

@@ -41,7 +41,7 @@ class CompositeByteBuf implements ByteBuf {
 
         int offset = 0;
         for (ByteBuf cur : buffers) {
-            Component component = new Component(cur.duplicate().order(ByteOrder.LITTLE_ENDIAN), offset);
+            Component component = new Component(cur.asReadOnly().order(ByteOrder.LITTLE_ENDIAN), offset);
             components.add(component);
             offset = component.endOffset;
         }