153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov/* 253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Copyright (C) 2016 The Android Open Source Project 353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Licensed under the Apache License, Version 2.0 (the "License"); 553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * you may not use this file except in compliance with the License. 653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * You may obtain a copy of the License at 753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * http://www.apache.org/licenses/LICENSE-2.0 953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 1053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Unless required by applicable law or agreed to in writing, software 1153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * distributed under the License is distributed on an "AS IS" BASIS, 1253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * See the License for the specific language governing permissions and 1453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * limitations under the License. 1553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 1653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 1753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovpackage android.util; 1853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 1953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport android.os.Parcel; 2053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport android.os.ParcelFileDescriptor; 2153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport android.os.Parcelable; 2253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport android.os.Process; 2304df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganovimport libcore.io.IoUtils; 2453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 2553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport java.io.Closeable; 2653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport java.io.IOException; 2753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovimport java.util.UUID; 2853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 2953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov/** 3053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * This class is an array of integers that is backed by shared memory. 3153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * It is useful for efficiently sharing state between processes. The 3253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * write and read operations are guaranteed to not result in read/ 3353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * write memory tear, i.e. they are atomic. However, multiple read/ 3453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * write operations are <strong>not</strong> synchronized between 3553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * each other. 3653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * <p> 3753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * The data structure is designed to have one owner process that can 3853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * read/write. There may be multiple client processes that can only read or 3953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * read/write depending how the data structure was configured when 4053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * instantiated. The owner process is the process that created the array. 4153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * The shared memory is pinned (not reclaimed by the system) until the 4253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * owning process dies or the data structure is closed. This class 4353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * is <strong>not</strong> thread safe. You should not interact with 4453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * an instance of this class once it is closed. 4553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * </p> 4653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 4753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @hide 4853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 4953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganovpublic final class MemoryIntArray implements Parcelable, Closeable { 5004df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov private static final String TAG = "MemoryIntArray"; 5104df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov 5253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private static final int MAX_SIZE = 1024; 5353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 5453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private final int mOwnerPid; 5553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private final boolean mClientWritable; 5653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private final long mMemoryAddr; 5753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private ParcelFileDescriptor mFd; 5853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 5953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 6053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Creates a new instance. 6153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 6253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @param size The size of the array in terms of integer slots. Cannot be 6353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * more than {@link #getMaxSize()}. 6453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @param clientWritable Whether other processes can write to the array. 6553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @throws IOException If an error occurs while accessing the shared memory. 6653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 6753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public MemoryIntArray(int size, boolean clientWritable) throws IOException { 6853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (size > MAX_SIZE) { 6953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov throw new IllegalArgumentException("Max size is " + MAX_SIZE); 7053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 7153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mOwnerPid = Process.myPid(); 7253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mClientWritable = clientWritable; 7353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov final String name = UUID.randomUUID().toString(); 7453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mFd = ParcelFileDescriptor.fromFd(nativeCreate(name, size)); 7553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mMemoryAddr = nativeOpen(mFd.getFd(), true, clientWritable); 7653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 7753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 7853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private MemoryIntArray(Parcel parcel) throws IOException { 7953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mOwnerPid = parcel.readInt(); 8053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mClientWritable = (parcel.readInt() == 1); 8153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mFd = parcel.readParcelable(null); 8253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (mFd == null) { 8353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov throw new IOException("No backing file descriptor"); 8453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 8553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov final long memoryAddress = parcel.readLong(); 8653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (isOwner()) { 8753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mMemoryAddr = memoryAddress; 8853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } else { 8953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mMemoryAddr = nativeOpen(mFd.getFd(), false, mClientWritable); 9053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 9153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 9253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 9353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 9453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @return Gets whether this array is mutable. 9553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 9653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public boolean isWritable() { 9753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceNotClosed(); 9853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return isOwner() || mClientWritable; 9953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 10053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 10153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 10253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Gets the value at a given index. 10353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 10453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @param index The index. 10553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @return The value at this index. 10653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @throws IOException If an error occurs while accessing the shared memory. 10753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 10853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public int get(int index) throws IOException { 10953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceNotClosed(); 11053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceValidIndex(index); 11153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return nativeGet(mFd.getFd(), mMemoryAddr, index, isOwner()); 11253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 11353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 11453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 11553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Sets the value at a given index. This method can be called only if 11653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * {@link #isWritable()} returns true which means your process is the 11753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * owner. 11853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 11953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @param index The index. 12053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @param value The value to set. 12153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @throws IOException If an error occurs while accessing the shared memory. 12253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 12353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public void set(int index, int value) throws IOException { 12453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceNotClosed(); 12553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceWritable(); 12653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceValidIndex(index); 12753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov nativeSet(mFd.getFd(), mMemoryAddr, index, value, isOwner()); 12853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 12953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 13053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 13153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Gets the array size. 13253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 13353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @throws IOException If an error occurs while accessing the shared memory. 13453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 13553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public int size() throws IOException { 13653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov enforceNotClosed(); 13753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return nativeSize(mFd.getFd()); 13853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 13953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 14053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 14153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * Closes the array releasing resources. 14253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * 14353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @throws IOException If an error occurs while accessing the shared memory. 14453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 14553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 14653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public void close() throws IOException { 14753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (!isClosed()) { 14804df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov ParcelFileDescriptor pfd = mFd; 14953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov mFd = null; 15004df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov nativeClose(pfd.getFd(), mMemoryAddr, isOwner()); 15153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 15253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 15353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 15453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 15553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @return Whether this array is closed and shouldn't be used. 15653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 15753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public boolean isClosed() { 15853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return mFd == null; 15953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 16053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 16153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 16253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov protected void finalize() throws Throwable { 16304df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov IoUtils.closeQuietly(this); 16453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov super.finalize(); 16553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 16653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 16753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 16853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public int describeContents() { 16953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return CONTENTS_FILE_DESCRIPTOR; 17053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 17153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 17253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 17353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public void writeToParcel(Parcel parcel, int flags) { 17453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov parcel.writeInt(mOwnerPid); 17553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov parcel.writeInt(mClientWritable ? 1 : 0); 17653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov parcel.writeParcelable(mFd, 0); 17753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov parcel.writeLong(mMemoryAddr); 17853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 17953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 18053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 18153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public boolean equals(Object obj) { 18253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (obj == null) { 18353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return false; 18453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 18553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (this == obj) { 18653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return true; 18753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 18853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (getClass() != obj.getClass()) { 18953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return false; 19053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 19153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov MemoryIntArray other = (MemoryIntArray) obj; 19253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (mFd == null) { 19353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (other.mFd != null) { 19453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return false; 19553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 19653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } else if (mFd.getFd() != other.mFd.getFd()) { 19753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return false; 19853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 19953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return true; 20053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 20153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 20253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 20353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public int hashCode() { 20453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return mFd != null ? mFd.hashCode() : 1; 20553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 20653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 20753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private boolean isOwner() { 20853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return mOwnerPid == Process.myPid(); 20953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 21053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 21153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private void enforceNotClosed() { 21253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (isClosed()) { 21353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov throw new IllegalStateException("cannot interact with a closed instance"); 21453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 21553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 21653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 21753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private void enforceValidIndex(int index) throws IOException { 21853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov final int size = size(); 21953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (index < 0 || index > size - 1) { 22053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov throw new IndexOutOfBoundsException( 22153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov index + " not between 0 and " + (size - 1)); 22253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 22353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 22453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 22553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private void enforceWritable() { 22653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov if (!isWritable()) { 22753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov throw new UnsupportedOperationException("array is not writable"); 22853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 22953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 23053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 23153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private native int nativeCreate(String name, int size); 23253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private native long nativeOpen(int fd, boolean owner, boolean writable); 23353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private native void nativeClose(int fd, long memoryAddr, boolean owner); 23453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private native int nativeGet(int fd, long memoryAddr, int index, boolean owner); 23553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private native void nativeSet(int fd, long memoryAddr, int index, int value, boolean owner); 23653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov private native int nativeSize(int fd); 23753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 23853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov /** 23953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov * @return The max array size. 24053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov */ 24153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public static int getMaxSize() { 24253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return MAX_SIZE; 24353a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 24453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 24553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public static final Parcelable.Creator<MemoryIntArray> CREATOR = 24653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov new Parcelable.Creator<MemoryIntArray>() { 24753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 24853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public MemoryIntArray createFromParcel(Parcel parcel) { 24953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov try { 25053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return new MemoryIntArray(parcel); 25153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } catch (IOException ioe) { 25204df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov Log.e(TAG, "Error unparceling MemoryIntArray"); 25304df738bcb6584dd82b731a67f4cf8d6925b061eSvetoslav Ganov return null; 25453a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 25553a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 25653a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov 25753a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov @Override 25853a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov public MemoryIntArray[] newArray(int size) { 25953a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov return new MemoryIntArray[size]; 26053a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov } 26153a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov }; 26253a441ca8eda5a3e6209a952b1bbd32a39e19a1cSvet Ganov} 263