| /* |
| * 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.geode.internal.offheap; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Implementation of MemoryInspector that provides for inspection of meta-data for off-heap memory |
| * blocks |
| */ |
| public class MemoryInspectorImpl implements MemoryInspector { |
| /** The inspection snapshot for MemoryInspector */ |
| private List<MemoryBlock> memoryBlocks; |
| |
| private FreeListManager freeList; |
| |
| public MemoryInspectorImpl(FreeListManager freeList) { |
| this.freeList = freeList; |
| } |
| |
| @Override |
| public synchronized void clearSnapshot() { |
| this.memoryBlocks = null; |
| } |
| |
| @Override |
| public synchronized void createSnapshot() { |
| List<MemoryBlock> value = this.memoryBlocks; |
| if (value == null) { |
| value = getOrderedBlocks(); |
| this.memoryBlocks = value; |
| } |
| } |
| |
| @Override |
| public synchronized List<MemoryBlock> getSnapshot() { |
| List<MemoryBlock> value = this.memoryBlocks; |
| if (value == null) { |
| return Collections.<MemoryBlock>emptyList(); |
| } else { |
| return value; |
| } |
| } |
| |
| |
| @Override |
| public MemoryBlock getFirstBlock() { |
| final List<MemoryBlock> value = getSnapshot(); |
| if (value.isEmpty()) { |
| return null; |
| } else { |
| return value.get(0); |
| } |
| } |
| |
| @Override |
| public List<MemoryBlock> getAllBlocks() { |
| return getOrderedBlocks(); |
| } |
| |
| @Override |
| public List<MemoryBlock> getAllocatedBlocks() { |
| return this.freeList.getAllocatedBlocks(); |
| } |
| |
| @Override |
| public MemoryBlock getBlockAfter(MemoryBlock block) { |
| if (block == null) { |
| return null; |
| } |
| List<MemoryBlock> blocks = getSnapshot(); |
| int nextBlock = blocks.indexOf(block) + 1; |
| if (nextBlock > 0 && blocks.size() > nextBlock) { |
| return blocks.get(nextBlock); |
| } else { |
| return null; |
| } |
| } |
| |
| private List<MemoryBlock> getOrderedBlocks() { |
| return this.freeList.getOrderedBlocks(); |
| } |
| |
| } |