1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.internal.os; 18 19/** 20 * Helper class for passing more arguments though a message 21 * and avoiding allocation of a custom class for wrapping the 22 * arguments. This class maintains a pool of instances and 23 * it is responsibility of the client to recycle and instance 24 * once it is no longer used. 25 */ 26public final class SomeArgs { 27 28 private static final int MAX_POOL_SIZE = 10; 29 30 private static SomeArgs sPool; 31 private static int sPoolSize; 32 private static Object sPoolLock = new Object(); 33 34 private SomeArgs mNext; 35 36 private boolean mInPool; 37 38 public Object arg1; 39 public Object arg2; 40 public Object arg3; 41 public Object arg4; 42 public int argi1; 43 public int argi2; 44 public int argi3; 45 public int argi4; 46 public int argi5; 47 public int argi6; 48 49 private SomeArgs() { 50 /* do nothing - reduce visibility */ 51 } 52 53 public static SomeArgs obtain() { 54 synchronized (sPoolLock) { 55 if (sPoolSize > 0) { 56 SomeArgs args = sPool; 57 sPool = sPool.mNext; 58 args.mNext = null; 59 args.mInPool = false; 60 sPoolSize--; 61 return args; 62 } else { 63 return new SomeArgs(); 64 } 65 } 66 } 67 68 public void recycle() { 69 if (mInPool) { 70 throw new IllegalStateException("Already recycled."); 71 } 72 synchronized (sPoolLock) { 73 clear(); 74 if (sPoolSize < MAX_POOL_SIZE) { 75 mNext = sPool; 76 mInPool = true; 77 sPool = this; 78 sPoolSize++; 79 } 80 } 81 } 82 83 private void clear() { 84 arg1 = null; 85 arg2 = null; 86 arg3 = null; 87 arg4 = null; 88 argi1 = 0; 89 argi2 = 0; 90 argi3 = 0; 91 argi4 = 0; 92 argi5 = 0; 93 argi6 = 0; 94 } 95} 96