mirror of https://github.com/NekoX-Dev/NekoX.git
126 lines
3.8 KiB
Java
126 lines
3.8 KiB
Java
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/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer2;
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import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
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import android.os.Binder;
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import android.os.Bundle;
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import android.os.IBinder;
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import android.os.Parcel;
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import android.os.RemoteException;
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import androidx.annotation.Nullable;
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import com.google.android.exoplayer2.util.Util;
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import com.google.common.collect.ImmutableList;
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import java.util.List;
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/**
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* A {@link Binder} to transfer a list of {@link Bundle Bundles} across processes by splitting the
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* list into multiple transactions.
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*
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* <p>Note: Using this class causes synchronous binder calls in the opposite direction regardless of
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* the "oneway" property.
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*
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* <p>Example usage:
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*
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* <pre>{@code
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* // Sender
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* List<Bundle> list = ...;
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* IBinder binder = new BundleListRetriever(list);
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* Bundle bundle = new Bundle();
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* bundle.putBinder("list", binder);
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*
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* // Receiver
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* Bundle bundle = ...; // Received from the sender
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* IBinder binder = bundle.getBinder("list");
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* List<Bundle> list = BundleListRetriever.getList(binder);
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* }</pre>
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*/
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public final class BundleListRetriever extends Binder {
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// Soft limit of an IPC buffer size
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private static final int SUGGESTED_MAX_IPC_SIZE =
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Util.SDK_INT >= 30 ? IBinder.getSuggestedMaxIpcSizeBytes() : 64 * 1024;
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private static final int REPLY_END_OF_LIST = 0;
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private static final int REPLY_CONTINUE = 1;
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private static final int REPLY_BREAK = 2;
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private final ImmutableList<Bundle> list;
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/** Creates a {@link Binder} to send a list of {@link Bundle Bundles} to another process. */
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public BundleListRetriever(List<Bundle> list) {
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this.list = ImmutableList.copyOf(list);
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}
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@Override
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protected boolean onTransact(int code, Parcel data, @Nullable Parcel reply, int flags)
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throws RemoteException {
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if (code != FIRST_CALL_TRANSACTION) {
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return super.onTransact(code, data, reply, flags);
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}
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if (reply == null) {
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return false;
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}
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int count = list.size();
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int index = data.readInt();
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while (index < count && reply.dataSize() < SUGGESTED_MAX_IPC_SIZE) {
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reply.writeInt(REPLY_CONTINUE);
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reply.writeBundle(list.get(index));
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index++;
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}
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reply.writeInt(index < count ? REPLY_BREAK : REPLY_END_OF_LIST);
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return true;
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}
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/**
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* Gets a list of {@link Bundle Bundles} from a {@link BundleListRetriever}.
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*
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* @param binder A binder interface backed by {@link BundleListRetriever}.
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* @return The list of {@link Bundle Bundles}.
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*/
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public static ImmutableList<Bundle> getList(IBinder binder) {
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ImmutableList.Builder<Bundle> builder = ImmutableList.builder();
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int index = 0;
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int replyCode = REPLY_CONTINUE;
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while (replyCode != REPLY_END_OF_LIST) {
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Parcel data = Parcel.obtain();
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Parcel reply = Parcel.obtain();
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try {
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data.writeInt(index);
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try {
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binder.transact(FIRST_CALL_TRANSACTION, data, reply, /* flags= */ 0);
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} catch (RemoteException e) {
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throw new RuntimeException(e);
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}
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while ((replyCode = reply.readInt()) == REPLY_CONTINUE) {
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builder.add(checkNotNull(reply.readBundle()));
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index++;
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}
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} finally {
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reply.recycle();
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data.recycle();
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}
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}
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return builder.build();
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}
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}
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