| /* |
| * 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.johnzon.core; |
| |
| import java.io.Serializable; |
| |
| public abstract class ThreadLocalBufferCache<T> implements Serializable { |
| // alloc are expensive so using a very trivial buffer, we remove from TL to say we use it and reset it when we are done (close) |
| private final ThreadLocal<T> buffers; |
| private final int defaultSize; |
| |
| public ThreadLocalBufferCache(final int defaultSize) { |
| this.buffers = new ThreadLocal<T>() { |
| @Override |
| protected T initialValue() { |
| return ThreadLocalBufferCache.this.newValue(defaultSize); |
| } |
| }; |
| this.defaultSize = defaultSize; |
| } |
| |
| protected abstract T newValue(final int defaultSize); |
| |
| public T getCache() { |
| final T cachedLoadedChars = buffers.get(); |
| if (cachedLoadedChars == null) { |
| return newValue(defaultSize); |
| } |
| buffers.set(null); // remove just kills the buffers |
| return cachedLoadedChars; |
| } |
| |
| |
| public void release(final T buffer) { |
| buffers.set(buffer); |
| } |
| } |