mirror of https://github.com/M66B/FairEmail.git
138 lines
5.6 KiB
Java
138 lines
5.6 KiB
Java
/*
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* Copyright 2018 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 androidx.room;
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import android.app.Service;
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import android.content.Intent;
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import android.os.IBinder;
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import android.os.RemoteCallbackList;
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import android.os.RemoteException;
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import android.util.Log;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import java.util.HashMap;
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/**
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* A {@link Service} for remote invalidation among multiple {@link InvalidationTracker} instances.
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* This service runs in the main app process. All the instances of {@link InvalidationTracker}
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* (potentially in other processes) has to connect to this service.
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*
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* <p>The intent to launch it can be specified by
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* {@link RoomDatabase.Builder#setMultiInstanceInvalidationServiceIntent}, although the service is
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* defined in the manifest by default so there should be no need to override it in a normal
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* situation.
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*/
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@ExperimentalRoomApi
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public class MultiInstanceInvalidationService extends Service {
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// synthetic access
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@SuppressWarnings("WeakerAccess")
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int mMaxClientId = 0;
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// synthetic access
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@SuppressWarnings("WeakerAccess")
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final HashMap<Integer, String> mClientNames = new HashMap<>();
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// synthetic access
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@SuppressWarnings("WeakerAccess")
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final RemoteCallbackList<IMultiInstanceInvalidationCallback> mCallbackList =
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new RemoteCallbackList<IMultiInstanceInvalidationCallback>() {
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@Override
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public void onCallbackDied(IMultiInstanceInvalidationCallback callback,
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Object cookie) {
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mClientNames.remove((int) cookie);
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}
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};
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private final IMultiInstanceInvalidationService.Stub mBinder =
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new IMultiInstanceInvalidationService.Stub() {
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// Assigns a client ID to the client.
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@Override
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public int registerCallback(IMultiInstanceInvalidationCallback callback,
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String name) {
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if (name == null) {
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return 0;
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}
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synchronized (mCallbackList) {
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int clientId = ++mMaxClientId;
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// Use the client ID as the RemoteCallbackList cookie.
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if (mCallbackList.register(callback, clientId)) {
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mClientNames.put(clientId, name);
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return clientId;
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} else {
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--mMaxClientId;
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return 0;
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}
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}
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}
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// Explicitly removes the client.
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// The client can die without calling this. In that case, mCallbackList
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// .onCallbackDied() can take care of removal.
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@Override
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public void unregisterCallback(IMultiInstanceInvalidationCallback callback,
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int clientId) {
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synchronized (mCallbackList) {
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mCallbackList.unregister(callback);
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mClientNames.remove(clientId);
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}
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}
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// Broadcasts table invalidation to other instances of the same database file.
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// The broadcast is not sent to the caller itself.
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@Override
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public void broadcastInvalidation(int clientId, String[] tables) {
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synchronized (mCallbackList) {
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String name = mClientNames.get(clientId);
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if (name == null) {
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Log.w(Room.LOG_TAG, "Remote invalidation client ID not registered");
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return;
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}
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int count = mCallbackList.beginBroadcast();
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try {
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for (int i = 0; i < count; i++) {
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int targetClientId = (int) mCallbackList.getBroadcastCookie(i);
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String targetName = mClientNames.get(targetClientId);
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if (clientId == targetClientId // This is the caller itself.
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|| !name.equals(targetName)) { // Not the same file.
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continue;
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}
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try {
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IMultiInstanceInvalidationCallback callback =
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mCallbackList.getBroadcastItem(i);
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callback.onInvalidation(tables);
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} catch (RemoteException e) {
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Log.w(Room.LOG_TAG, "Error invoking a remote callback", e);
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}
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}
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} finally {
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mCallbackList.finishBroadcast();
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}
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}
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}
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};
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@Nullable
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@Override
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public IBinder onBind(@NonNull Intent intent) {
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return mBinder;
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}
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}
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