| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.hyracks.control.nc.resources.memory; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.hyracks.api.comm.FrameConstants; |
| import org.apache.hyracks.api.comm.FrameHelper; |
| import org.apache.hyracks.api.context.IHyracksFrameMgrContext; |
| import org.apache.hyracks.api.exceptions.HyracksDataException; |
| |
| public class FrameManager implements IHyracksFrameMgrContext { |
| |
| private final int minFrameSize; |
| |
| public FrameManager(int minFrameSize) { |
| this.minFrameSize = minFrameSize; |
| } |
| |
| @Override |
| public int getInitialFrameSize() { |
| return minFrameSize; |
| } |
| |
| @Override |
| public ByteBuffer allocateFrame() throws HyracksDataException { |
| return allocateFrame(minFrameSize); |
| } |
| |
| @Override |
| public ByteBuffer allocateFrame(int bytes) throws HyracksDataException { |
| if (bytes % minFrameSize != 0) { |
| throw new HyracksDataException("The size should be an integral multiple of the default frame size"); |
| } |
| ByteBuffer buffer = ByteBuffer.allocate(bytes); |
| if (bytes / minFrameSize > FrameConstants.MAX_NUM_MINFRAME) { |
| throw new HyracksDataException( |
| "Unable to allocate frame larger than:" + FrameConstants.MAX_NUM_MINFRAME + " bytes"); |
| } |
| FrameHelper.serializeFrameSize(buffer, (byte) (bytes / minFrameSize)); |
| return (ByteBuffer) buffer.clear(); |
| } |
| |
| @Override |
| public ByteBuffer reallocateFrame(ByteBuffer tobeDeallocate, int newSizeInBytes, boolean copyOldData) |
| throws HyracksDataException { |
| if (!copyOldData) { |
| deallocateFrames(tobeDeallocate.capacity()); |
| return allocateFrame(newSizeInBytes); |
| } else { |
| ByteBuffer buffer = allocateFrame(newSizeInBytes); |
| int limit = Math.min(newSizeInBytes, tobeDeallocate.capacity()); |
| int pos = Math.min(limit, tobeDeallocate.position()); |
| tobeDeallocate.position(0); |
| tobeDeallocate.limit(limit); |
| buffer.put(tobeDeallocate); |
| buffer.position(pos); |
| |
| if (newSizeInBytes / minFrameSize > FrameConstants.MAX_NUM_MINFRAME) { |
| throw new HyracksDataException("Unable to allocate frame of size bigger than MinFrameSize * " |
| + FrameConstants.MAX_NUM_MINFRAME); |
| } |
| FrameHelper.serializeFrameSize(buffer, (byte) (newSizeInBytes / minFrameSize)); |
| return buffer; |
| } |
| } |
| |
| @Override |
| public void deallocateFrames(int bytes) { |
| //TODO make a global memory manager to allocate and deallocate the frames. |
| } |
| } |