156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson/* 256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Copyright (C) 2010 Google Inc. 356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Licensed under the Apache License, Version 2.0 (the "License"); 556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * you may not use this file except in compliance with the License. 656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * You may obtain a copy of the License at 756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * http://www.apache.org/licenses/LICENSE-2.0 956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 1056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Unless required by applicable law or agreed to in writing, software 1156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * distributed under the License is distributed on an "AS IS" BASIS, 1256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * See the License for the specific language governing permissions and 1456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * limitations under the License. 1556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson */ 1656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 1756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonpackage com.google.clearsilver.jsilver.output; 1856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 1956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson/** 2056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Implementation of OutputBufferProvider that reuses the same StringBuilder in each Thread. 2156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson */ 2256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonpublic class ThreadLocalOutputBufferProvider implements OutputBufferProvider { 2356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 2456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private final ThreadLocal<StringBuilder> pool; 2556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private final ThreadLocal<Boolean> available; 2656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 2756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public ThreadLocalOutputBufferProvider(final int bufferSize) { 2856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson pool = new ThreadLocal<StringBuilder>() { 2956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson protected StringBuilder initialValue() { 3056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return new StringBuilder(bufferSize); 3156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 3256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson }; 3356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson available = new ThreadLocal<Boolean>() { 3456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson protected Boolean initialValue() { 3556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return true; 3656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 3756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson }; 3856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 3956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 4056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 4156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public Appendable get() { 4256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson if (!available.get()) { 4356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson throw new IllegalStateException("Thread buffer is not free."); 4456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 4556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson StringBuilder sb = pool.get(); 4656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson available.set(false); 4756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson sb.setLength(0); 4856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return sb; 4956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 5156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 5256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public void release(Appendable buffer) { 5356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson if (buffer != pool.get()) { 5456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson throw new IllegalArgumentException("Can't release buffer that does not " 5556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson + "correspond to this thread."); 5656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson available.set(true); 5856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson} 60