| /* |
| * Copyright 2021 The Android Open Source Project |
| * |
| * Licensed 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 com.google.android.exoplayer2; |
| |
| import static com.google.android.exoplayer2.util.Assertions.checkNotNull; |
| |
| import android.os.Binder; |
| import android.os.Bundle; |
| import android.os.IBinder; |
| import android.os.Parcel; |
| import android.os.RemoteException; |
| import androidx.annotation.Nullable; |
| import com.google.android.exoplayer2.util.Util; |
| import com.google.common.collect.ImmutableList; |
| import java.util.List; |
| |
| /** |
| * A {@link Binder} to transfer a list of {@link Bundle Bundles} across processes by splitting the |
| * list into multiple transactions. |
| * |
| * <p>Note: Using this class causes synchronous binder calls in the opposite direction regardless of |
| * the "oneway" property. |
| * |
| * <p>Example usage: |
| * |
| * <pre>{@code |
| * // Sender |
| * List<Bundle> list = ...; |
| * IBinder binder = new BundleListRetriever(list); |
| * Bundle bundle = new Bundle(); |
| * bundle.putBinder("list", binder); |
| * |
| * // Receiver |
| * Bundle bundle = ...; // Received from the sender |
| * IBinder binder = bundle.getBinder("list"); |
| * List<Bundle> list = BundleListRetriever.getList(binder); |
| * }</pre> |
| */ |
| public final class BundleListRetriever extends Binder { |
| |
| // Soft limit of an IPC buffer size |
| private static final int SUGGESTED_MAX_IPC_SIZE = |
| Util.SDK_INT >= 30 ? IBinder.getSuggestedMaxIpcSizeBytes() : 64 * 1024; |
| |
| private static final int REPLY_END_OF_LIST = 0; |
| private static final int REPLY_CONTINUE = 1; |
| private static final int REPLY_BREAK = 2; |
| |
| private final ImmutableList<Bundle> list; |
| |
| /** Creates a {@link Binder} to send a list of {@link Bundle Bundles} to another process. */ |
| public BundleListRetriever(List<Bundle> list) { |
| this.list = ImmutableList.copyOf(list); |
| } |
| |
| @Override |
| protected boolean onTransact(int code, Parcel data, @Nullable Parcel reply, int flags) |
| throws RemoteException { |
| if (code != FIRST_CALL_TRANSACTION) { |
| return super.onTransact(code, data, reply, flags); |
| } |
| |
| if (reply == null) { |
| return false; |
| } |
| |
| int count = list.size(); |
| int index = data.readInt(); |
| while (index < count && reply.dataSize() < SUGGESTED_MAX_IPC_SIZE) { |
| reply.writeInt(REPLY_CONTINUE); |
| reply.writeBundle(list.get(index)); |
| index++; |
| } |
| reply.writeInt(index < count ? REPLY_BREAK : REPLY_END_OF_LIST); |
| return true; |
| } |
| |
| /** |
| * Gets a list of {@link Bundle Bundles} from a {@link BundleListRetriever}. |
| * |
| * @param binder A binder interface backed by {@link BundleListRetriever}. |
| * @return The list of {@link Bundle Bundles}. |
| */ |
| public static ImmutableList<Bundle> getList(IBinder binder) { |
| ImmutableList.Builder<Bundle> builder = ImmutableList.builder(); |
| |
| int index = 0; |
| int replyCode = REPLY_CONTINUE; |
| |
| while (replyCode != REPLY_END_OF_LIST) { |
| Parcel data = Parcel.obtain(); |
| Parcel reply = Parcel.obtain(); |
| try { |
| data.writeInt(index); |
| try { |
| binder.transact(FIRST_CALL_TRANSACTION, data, reply, /* flags= */ 0); |
| } catch (RemoteException e) { |
| throw new RuntimeException(e); |
| } |
| while ((replyCode = reply.readInt()) == REPLY_CONTINUE) { |
| builder.add(checkNotNull(reply.readBundle())); |
| index++; |
| } |
| } finally { |
| reply.recycle(); |
| data.recycle(); |
| } |
| } |
| |
| return builder.build(); |
| } |
| } |