| /* |
| * Copyright (C) 2018 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.android.internal.infra; |
| |
| import static com.android.internal.util.function.pooled.PooledLambda.obtainMessage; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.app.ActivityManager; |
| import android.app.ApplicationExitInfo; |
| import android.app.IActivityManager; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.ServiceConnection; |
| import android.content.pm.ParceledListSlice; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.IBinder.DeathRecipient; |
| import android.os.IInterface; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.Slog; |
| import android.util.TimeUtils; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.io.PrintWriter; |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Base class representing a remote service. |
| * |
| * <p>It abstracts away the binding and unbinding from the remote implementation, so clients can |
| * call its methods without worrying about when and how to bind/unbind/timeout. |
| * |
| * <p>All state of this class is modified on a handler thread. |
| * |
| * <p><b>NOTE: </b>this class should not be extended directly, you should extend either |
| * {@link AbstractSinglePendingRequestRemoteService} or |
| * {@link AbstractMultiplePendingRequestsRemoteService}. |
| * |
| * <p>See {@code com.android.server.autofill.RemoteFillService} for a concrete |
| * (no pun intended) example of how to use it. |
| * |
| * @param <S> the concrete remote service class |
| * @param <I> the interface of the binder service |
| * |
| * @deprecated Use {@link ServiceConnector} to manage remote service connections |
| * |
| * @hide |
| */ |
| //TODO(b/117779333): improve javadoc above instead of using Autofill as an example |
| @Deprecated |
| public abstract class AbstractRemoteService<S extends AbstractRemoteService<S, I>, |
| I extends IInterface> implements DeathRecipient { |
| private static final int SERVICE_NOT_EXIST = -1; |
| private static final int MSG_BIND = 1; |
| private static final int MSG_UNBIND = 2; |
| |
| public static final long PERMANENT_BOUND_TIMEOUT_MS = 0; |
| |
| protected static final int LAST_PRIVATE_MSG = MSG_UNBIND; |
| |
| // TODO(b/117779333): convert all booleans into an integer / flags |
| public final boolean mVerbose; |
| |
| protected final String mTag = getClass().getSimpleName(); |
| protected final Handler mHandler; |
| protected final ComponentName mComponentName; |
| |
| private final Context mContext; |
| private final Intent mIntent; |
| private final VultureCallback<S> mVultureCallback; |
| private final int mUserId; |
| private final ServiceConnection mServiceConnection = new RemoteServiceConnection(); |
| private final int mBindingFlags; |
| protected I mService; |
| |
| private boolean mBound; |
| private boolean mConnecting; |
| private boolean mDestroyed; |
| private boolean mServiceDied; |
| private boolean mCompleted; |
| |
| // Used just for debugging purposes (on dump) |
| private long mNextUnbind; |
| // Used just for debugging purposes (on dump) |
| private int mServiceExitReason; |
| private int mServiceExitSubReason; |
| |
| /** Requests that have been scheduled, but that are not finished yet */ |
| protected final ArrayList<BasePendingRequest<S, I>> mUnfinishedRequests = new ArrayList<>(); |
| |
| /** |
| * Callback called when the service dies. |
| * |
| * @param <T> service class |
| */ |
| public interface VultureCallback<T> { |
| /** |
| * Called when the service dies. |
| * |
| * @param service service that died! |
| */ |
| void onServiceDied(T service); |
| } |
| |
| // NOTE: must be package-protected so this class is not extended outside |
| AbstractRemoteService(@NonNull Context context, @NonNull String serviceInterface, |
| @NonNull ComponentName componentName, int userId, @NonNull VultureCallback<S> callback, |
| @NonNull Handler handler, int bindingFlags, boolean verbose) { |
| mContext = context; |
| mVultureCallback = callback; |
| mVerbose = verbose; |
| mComponentName = componentName; |
| mIntent = new Intent(serviceInterface).setComponent(mComponentName); |
| mUserId = userId; |
| mHandler = new Handler(handler.getLooper()); |
| mBindingFlags = bindingFlags; |
| mServiceExitReason = SERVICE_NOT_EXIST; |
| mServiceExitSubReason = SERVICE_NOT_EXIST; |
| } |
| |
| /** |
| * Destroys this service. |
| */ |
| public final void destroy() { |
| mHandler.sendMessage(obtainMessage(AbstractRemoteService::handleDestroy, this)); |
| } |
| |
| /** |
| * Checks whether this service is destroyed. |
| */ |
| public final boolean isDestroyed() { |
| return mDestroyed; |
| } |
| |
| /** |
| * Gets the name of the service. |
| */ |
| @NonNull |
| public final ComponentName getComponentName() { |
| return mComponentName; |
| } |
| |
| private void handleOnConnectedStateChangedInternal(boolean connected) { |
| handleOnConnectedStateChanged(connected); |
| if (connected) { |
| handlePendingRequests(); |
| } |
| } |
| |
| /** |
| * Handles the pending requests when the connection it bounds to the remote service. |
| */ |
| abstract void handlePendingRequests(); |
| |
| /** |
| * Callback called when the system connected / disconnected to the service and the pending |
| * requests have been handled. |
| * |
| * @param state {@code true} when connected, {@code false} when disconnected. |
| */ |
| protected void handleOnConnectedStateChanged(boolean state) { |
| } |
| |
| /** |
| * Gets the base Binder interface from the service. |
| */ |
| @NonNull |
| protected abstract I getServiceInterface(@NonNull IBinder service); |
| |
| /** |
| * Defines how long after the last interaction with the service we would unbind. |
| * |
| * @return time to unbind (in millis), or {@link #PERMANENT_BOUND_TIMEOUT_MS} to not unbind. |
| */ |
| protected abstract long getTimeoutIdleBindMillis(); |
| |
| /** |
| * Defines how long after we make a remote request to a fill service we timeout. |
| * |
| * <p>Just need to be overridden by subclasses that uses sync {@link PendingRequest}s. |
| * |
| * @throws UnsupportedOperationException if called when not overridden. |
| * |
| */ |
| protected long getRemoteRequestMillis() { |
| throw new UnsupportedOperationException("not implemented by " + getClass()); |
| } |
| |
| /** |
| * Gets the currently registered service interface or {@code null} if the service is not |
| * connected. |
| */ |
| @Nullable |
| public final I getServiceInterface() { |
| return mService; |
| } |
| |
| private void handleDestroy() { |
| if (checkIfDestroyed()) return; |
| handleOnDestroy(); |
| handleEnsureUnbound(); |
| mDestroyed = true; |
| } |
| |
| /** |
| * Clears the state when this object is destroyed. |
| * |
| * <p>Typically used to cancel the pending requests. |
| */ |
| protected abstract void handleOnDestroy(); |
| |
| @Override // from DeathRecipient |
| public void binderDied() { |
| mHandler.sendMessage(obtainMessage(AbstractRemoteService::handleBinderDied, this)); |
| } |
| |
| private void handleBinderDied() { |
| if (checkIfDestroyed()) return; |
| if (mService != null) { |
| mService.asBinder().unlinkToDeath(this, 0); |
| } |
| updateServicelicationExitInfo(mComponentName, mUserId); |
| mConnecting = true; |
| mService = null; |
| mServiceDied = true; |
| cancelScheduledUnbind(); |
| @SuppressWarnings("unchecked") // TODO(b/117779333): fix this warning |
| final S castService = (S) this; |
| mVultureCallback.onServiceDied(castService); |
| handleBindFailure(); |
| } |
| |
| private void updateServicelicationExitInfo(ComponentName componentName, int userId) { |
| IActivityManager am = ActivityManager.getService(); |
| String packageName = componentName.getPackageName(); |
| ParceledListSlice<ApplicationExitInfo> plistSlice = null; |
| try { |
| plistSlice = am.getHistoricalProcessExitReasons(packageName, 0, 1, userId); |
| } catch (RemoteException e) { |
| // do nothing. The local binder so it can not throw it. |
| } |
| if (plistSlice == null) { |
| return; |
| } |
| List<ApplicationExitInfo> list = plistSlice.getList(); |
| if (list.isEmpty()) { |
| return; |
| } |
| ApplicationExitInfo info = list.get(0); |
| mServiceExitReason = info.getReason(); |
| mServiceExitSubReason = info.getSubReason(); |
| if (mVerbose) { |
| Slog.v(mTag, "updateServicelicationExitInfo: exitReason=" |
| + ApplicationExitInfo.reasonCodeToString(mServiceExitReason) |
| + " exitSubReason= " + ApplicationExitInfo.subreasonToString( |
| mServiceExitSubReason)); |
| } |
| } |
| |
| // Note: we are dumping without a lock held so this is a bit racy but |
| // adding a lock to a class that offloads to a handler thread would |
| // mean adding a lock adding overhead to normal runtime operation. |
| /** |
| * Dump it! |
| */ |
| public void dump(@NonNull String prefix, @NonNull PrintWriter pw) { |
| String tab = " "; |
| pw.append(prefix).append("service:").println(); |
| pw.append(prefix).append(tab).append("userId=") |
| .append(String.valueOf(mUserId)).println(); |
| pw.append(prefix).append(tab).append("componentName=") |
| .append(mComponentName.flattenToString()).println(); |
| pw.append(prefix).append(tab).append("destroyed=") |
| .append(String.valueOf(mDestroyed)).println(); |
| pw.append(prefix).append(tab).append("numUnfinishedRequests=") |
| .append(String.valueOf(mUnfinishedRequests.size())).println(); |
| pw.append(prefix).append(tab).append("bound=") |
| .append(String.valueOf(mBound)); |
| final boolean bound = handleIsBound(); |
| pw.append(prefix).append(tab).append("connected=") |
| .append(String.valueOf(bound)); |
| final long idleTimeout = getTimeoutIdleBindMillis(); |
| if (bound) { |
| if (idleTimeout > 0) { |
| pw.append(" (unbind in : "); |
| TimeUtils.formatDuration(mNextUnbind - SystemClock.elapsedRealtime(), pw); |
| pw.append(")"); |
| } else { |
| pw.append(" (permanently bound)"); |
| } |
| } |
| pw.println(); |
| if (mServiceExitReason != SERVICE_NOT_EXIST) { |
| pw.append(prefix).append(tab).append("serviceExistReason=") |
| .append(ApplicationExitInfo.reasonCodeToString(mServiceExitReason)); |
| pw.println(); |
| } |
| if (mServiceExitSubReason != SERVICE_NOT_EXIST) { |
| pw.append(prefix).append(tab).append("serviceExistSubReason=") |
| .append(ApplicationExitInfo.subreasonToString(mServiceExitSubReason)); |
| pw.println(); |
| } |
| pw.append(prefix).append("mBindingFlags=").println(mBindingFlags); |
| pw.append(prefix).append("idleTimeout=") |
| .append(Long.toString(idleTimeout / 1000)).append("s\n"); |
| pw.append(prefix).append("requestTimeout="); |
| try { |
| pw.append(Long.toString(getRemoteRequestMillis() / 1000)).append("s\n"); |
| } catch (UnsupportedOperationException e) { |
| pw.append("not supported\n"); |
| } |
| pw.println(); |
| } |
| |
| /** |
| * Schedules a "sync" request. |
| * |
| * <p>This request must be responded by the service somehow (typically using a callback), |
| * othewise it will trigger a {@link PendingRequest#onTimeout(AbstractRemoteService)} if the |
| * service doesn't respond. |
| */ |
| protected void scheduleRequest(@NonNull BasePendingRequest<S, I> pendingRequest) { |
| mHandler.sendMessage(obtainMessage( |
| AbstractRemoteService::handlePendingRequest, this, pendingRequest)); |
| } |
| |
| /** |
| * Marks a pendingRequest as finished. |
| * |
| * @param finshedRequest The request that is finished |
| */ |
| void finishRequest(@NonNull BasePendingRequest<S, I> finshedRequest) { |
| mHandler.sendMessage( |
| obtainMessage(AbstractRemoteService::handleFinishRequest, this, finshedRequest)); |
| } |
| |
| private void handleFinishRequest(@NonNull BasePendingRequest<S, I> finishedRequest) { |
| synchronized (mUnfinishedRequests) { |
| mUnfinishedRequests.remove(finishedRequest); |
| } |
| if (mUnfinishedRequests.isEmpty()) { |
| scheduleUnbind(); |
| } |
| } |
| |
| /** |
| * Schedules an async request. |
| * |
| * <p>This request is not expecting a callback from the service, hence it's represented by |
| * a simple {@link Runnable}. |
| */ |
| protected void scheduleAsyncRequest(@NonNull AsyncRequest<I> request) { |
| // TODO(b/117779333): fix generics below |
| @SuppressWarnings({"unchecked", "rawtypes"}) |
| final MyAsyncPendingRequest<S, I> asyncRequest = new MyAsyncPendingRequest(this, request); |
| mHandler.sendMessage( |
| obtainMessage(AbstractRemoteService::handlePendingRequest, this, asyncRequest)); |
| } |
| |
| /** |
| * Executes an async request immediately instead of sending it to Handler queue as what |
| * {@link scheduleAsyncRequest} does. |
| * |
| * <p>This request is not expecting a callback from the service, hence it's represented by |
| * a simple {@link Runnable}. |
| */ |
| protected void executeAsyncRequest(@NonNull AsyncRequest<I> request) { |
| // TODO(b/117779333): fix generics below |
| @SuppressWarnings({"unchecked", "rawtypes"}) |
| final MyAsyncPendingRequest<S, I> asyncRequest = new MyAsyncPendingRequest(this, request); |
| handlePendingRequest(asyncRequest); |
| } |
| |
| private void cancelScheduledUnbind() { |
| mHandler.removeMessages(MSG_UNBIND); |
| } |
| |
| /** |
| * Schedules a request to bind to the remote service. |
| * |
| * <p>Typically used on constructor for implementations that need a permanent connection to |
| * the remote service. |
| */ |
| protected void scheduleBind() { |
| if (mHandler.hasMessages(MSG_BIND)) { |
| if (mVerbose) Slog.v(mTag, "scheduleBind(): already scheduled"); |
| return; |
| } |
| mHandler.sendMessage(obtainMessage(AbstractRemoteService::handleEnsureBound, this) |
| .setWhat(MSG_BIND)); |
| } |
| |
| /** |
| * Schedules a request to automatically unbind from the service after the |
| * {@link #getTimeoutIdleBindMillis() idle timeout} expires. |
| */ |
| protected void scheduleUnbind() { |
| scheduleUnbind(true); |
| } |
| |
| private void scheduleUnbind(boolean delay) { |
| long unbindDelay = getTimeoutIdleBindMillis(); |
| |
| if (unbindDelay <= PERMANENT_BOUND_TIMEOUT_MS) { |
| if (mVerbose) Slog.v(mTag, "not scheduling unbind when value is " + unbindDelay); |
| return; |
| } |
| |
| if (!delay) { |
| unbindDelay = 0; |
| } |
| |
| cancelScheduledUnbind(); |
| // TODO(b/117779333): make sure it's unbound if the service settings changing (right now |
| // it's not) |
| |
| mNextUnbind = SystemClock.elapsedRealtime() + unbindDelay; |
| if (mVerbose) Slog.v(mTag, "unbinding in " + unbindDelay + "ms: " + mNextUnbind); |
| mHandler.sendMessageDelayed(obtainMessage(AbstractRemoteService::handleUnbind, this) |
| .setWhat(MSG_UNBIND), unbindDelay); |
| } |
| |
| private void handleUnbind() { |
| if (checkIfDestroyed()) return; |
| |
| handleEnsureUnbound(); |
| } |
| |
| /** |
| * Handles a request, either processing it right now when bound, or saving it to be handled when |
| * bound. |
| */ |
| protected final void handlePendingRequest(@NonNull BasePendingRequest<S, I> pendingRequest) { |
| if (checkIfDestroyed() || mCompleted) return; |
| |
| if (!handleIsBound()) { |
| if (mVerbose) Slog.v(mTag, "handlePendingRequest(): queuing " + pendingRequest); |
| handlePendingRequestWhileUnBound(pendingRequest); |
| handleEnsureBound(); |
| } else { |
| if (mVerbose) Slog.v(mTag, "handlePendingRequest(): " + pendingRequest); |
| |
| synchronized (mUnfinishedRequests) { |
| mUnfinishedRequests.add(pendingRequest); |
| } |
| cancelScheduledUnbind(); |
| |
| pendingRequest.run(); |
| if (pendingRequest.isFinal()) { |
| mCompleted = true; |
| } |
| } |
| } |
| |
| /** |
| * Defines what to do with a request that arrives while not bound to the service. |
| */ |
| abstract void handlePendingRequestWhileUnBound( |
| @NonNull BasePendingRequest<S, I> pendingRequest); |
| |
| /** |
| * Called if {@link Context#bindServiceAsUser} returns {@code false}, or |
| * if {@link DeathRecipient#binderDied()} is called. |
| */ |
| abstract void handleBindFailure(); |
| |
| // This is actually checking isConnected. TODO: rename this and other related methods (or just |
| // stop using this class..) |
| private boolean handleIsBound() { |
| return mService != null; |
| } |
| |
| private void handleEnsureBound() { |
| if (handleIsBound() || mConnecting) return; |
| |
| if (mVerbose) Slog.v(mTag, "ensureBound()"); |
| mConnecting = true; |
| |
| final int flags = Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE |
| | Context.BIND_INCLUDE_CAPABILITIES | mBindingFlags; |
| |
| final boolean willBind = mContext.bindServiceAsUser(mIntent, mServiceConnection, flags, |
| mHandler, new UserHandle(mUserId)); |
| mBound = true; |
| |
| if (!willBind) { |
| Slog.w(mTag, "could not bind to " + mIntent + " using flags " + flags); |
| mConnecting = false; |
| |
| if (!mServiceDied) { |
| handleBinderDied(); |
| } |
| } |
| } |
| |
| private void handleEnsureUnbound() { |
| if (!handleIsBound() && !mConnecting) return; |
| |
| if (mVerbose) Slog.v(mTag, "ensureUnbound()"); |
| mConnecting = false; |
| if (handleIsBound()) { |
| handleOnConnectedStateChangedInternal(false); |
| if (mService != null) { |
| mService.asBinder().unlinkToDeath(this, 0); |
| mService = null; |
| } |
| } |
| mNextUnbind = 0; |
| if (mBound) { |
| mContext.unbindService(mServiceConnection); |
| mBound = false; |
| } |
| } |
| |
| private class RemoteServiceConnection implements ServiceConnection { |
| @Override |
| public void onServiceConnected(ComponentName name, IBinder service) { |
| if (mVerbose) Slog.v(mTag, "onServiceConnected()"); |
| if (mDestroyed || !mConnecting) { |
| // This is abnormal. Unbinding the connection has been requested already. |
| Slog.wtf(mTag, "onServiceConnected() was dispatched after unbindService."); |
| return; |
| } |
| mConnecting = false; |
| try { |
| service.linkToDeath(AbstractRemoteService.this, 0); |
| } catch (RemoteException re) { |
| handleBinderDied(); |
| return; |
| } |
| mService = getServiceInterface(service); |
| mServiceExitReason = SERVICE_NOT_EXIST; |
| mServiceExitSubReason = SERVICE_NOT_EXIST; |
| handleOnConnectedStateChangedInternal(true); |
| mServiceDied = false; |
| } |
| |
| @Override |
| public void onServiceDisconnected(ComponentName name) { |
| if (mVerbose) Slog.v(mTag, "onServiceDisconnected()"); |
| mConnecting = true; |
| mService = null; |
| } |
| |
| @Override |
| public void onBindingDied(ComponentName name) { |
| if (mVerbose) Slog.v(mTag, "onBindingDied()"); |
| scheduleUnbind(false); |
| } |
| } |
| |
| private boolean checkIfDestroyed() { |
| if (mDestroyed) { |
| if (mVerbose) { |
| Slog.v(mTag, "Not handling operation as service for " + mComponentName |
| + " is already destroyed"); |
| } |
| } |
| return mDestroyed; |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + "[" + mComponentName |
| + " " + System.identityHashCode(this) |
| + (mService != null ? " (bound)" : " (unbound)") |
| + (mDestroyed ? " (destroyed)" : "") |
| + "]"; |
| } |
| |
| /** |
| * Base class for the requests serviced by the remote service. |
| * |
| * <p><b>NOTE: </b> this class is not used directly, you should either override |
| * {@link com.android.internal.infra.AbstractRemoteService.PendingRequest} for sync requests, or |
| * use {@link AbstractRemoteService#scheduleAsyncRequest(AsyncRequest)} for async requests. |
| * |
| * @param <S> the remote service class |
| * @param <I> the interface of the binder service |
| */ |
| public abstract static class BasePendingRequest<S extends AbstractRemoteService<S, I>, |
| I extends IInterface> implements Runnable { |
| protected final String mTag = getClass().getSimpleName(); |
| protected final Object mLock = new Object(); |
| |
| final WeakReference<S> mWeakService; |
| |
| @GuardedBy("mLock") |
| boolean mCancelled; |
| |
| @GuardedBy("mLock") |
| boolean mCompleted; |
| |
| BasePendingRequest(@NonNull S service) { |
| mWeakService = new WeakReference<>(service); |
| } |
| |
| /** |
| * Gets a reference to the remote service. |
| */ |
| protected final S getService() { |
| return mWeakService.get(); |
| } |
| |
| /** |
| * Subclasses must call this method when the remote service finishes, i.e., when the service |
| * finishes processing a request. |
| * |
| * @return {@code false} in the service is already finished, {@code true} otherwise. |
| */ |
| protected final boolean finish() { |
| synchronized (mLock) { |
| if (mCompleted || mCancelled) { |
| return false; |
| } |
| mCompleted = true; |
| } |
| |
| S service = mWeakService.get(); |
| if (service != null) { |
| service.finishRequest(this); |
| } |
| |
| onFinished(); |
| |
| return true; |
| } |
| |
| void onFinished() { } |
| |
| /** |
| * Called when request fails due to reasons internal to {@link AbstractRemoteService}, |
| * e.g. failure to bind to service. |
| */ |
| protected void onFailed() { } |
| |
| /** |
| * Checks whether this request was cancelled. |
| */ |
| @GuardedBy("mLock") |
| protected final boolean isCancelledLocked() { |
| return mCancelled; |
| } |
| |
| /** |
| * Cancels the service. |
| * |
| * @return {@code false} if service is already canceled, {@code true} otherwise. |
| */ |
| public boolean cancel() { |
| synchronized (mLock) { |
| if (mCancelled || mCompleted) { |
| return false; |
| } |
| mCancelled = true; |
| } |
| |
| S service = mWeakService.get(); |
| if (service != null) { |
| service.finishRequest(this); |
| } |
| |
| onCancel(); |
| return true; |
| } |
| |
| void onCancel() {} |
| |
| /** |
| * Checks whether this request leads to a final state where no other requests can be made. |
| */ |
| protected boolean isFinal() { |
| return false; |
| } |
| |
| protected boolean isRequestCompleted() { |
| synchronized (mLock) { |
| return mCompleted; |
| } |
| } |
| } |
| |
| /** |
| * Base class for the requests serviced by the remote service. |
| * |
| * <p><b>NOTE: </b> this class is typically used when the service needs to use a callback to |
| * communicate back with the system server. For cases where that's not needed, you should use |
| * {@link AbstractRemoteService#scheduleAsyncRequest(AsyncRequest)} instead. |
| * |
| * <p><b>NOTE: </b> you must override {@link AbstractRemoteService#getRemoteRequestMillis()}, |
| * otherwise the constructor will throw an {@link UnsupportedOperationException}. |
| * |
| * @param <S> the remote service class |
| * @param <I> the interface of the binder service |
| */ |
| public abstract static class PendingRequest<S extends AbstractRemoteService<S, I>, |
| I extends IInterface> extends BasePendingRequest<S, I> { |
| |
| private final Runnable mTimeoutTrigger; |
| private final Handler mServiceHandler; |
| |
| protected PendingRequest(S service) { |
| super(service); |
| mServiceHandler = service.mHandler; |
| |
| mTimeoutTrigger = () -> { |
| synchronized (mLock) { |
| if (mCancelled) { |
| return; |
| } |
| mCompleted = true; |
| } |
| |
| final S remoteService = mWeakService.get(); |
| if (remoteService != null) { |
| // TODO(b/117779333): we should probably ignore it if service is destroyed. |
| Slog.w(mTag, "timed out after " + service.getRemoteRequestMillis() + " ms"); |
| remoteService.finishRequest(this); |
| onTimeout(remoteService); |
| } else { |
| Slog.w(mTag, "timed out (no service)"); |
| } |
| }; |
| mServiceHandler.postAtTime(mTimeoutTrigger, |
| SystemClock.uptimeMillis() + service.getRemoteRequestMillis()); |
| } |
| |
| @Override |
| final void onFinished() { |
| mServiceHandler.removeCallbacks(mTimeoutTrigger); |
| } |
| |
| @Override |
| final void onCancel() { |
| mServiceHandler.removeCallbacks(mTimeoutTrigger); |
| } |
| |
| /** |
| * Called by the self-destruct timeout when the remote service didn't reply to the |
| * request on time. |
| */ |
| protected abstract void onTimeout(S remoteService); |
| } |
| |
| /** |
| * Represents a request that does not expect a callback from the remote service. |
| * |
| * @param <I> the interface of the binder service |
| */ |
| public interface AsyncRequest<I extends IInterface> { |
| |
| /** |
| * Run Forrest, run! |
| */ |
| void run(@NonNull I binder) throws RemoteException; |
| } |
| |
| private static final class MyAsyncPendingRequest<S extends AbstractRemoteService<S, I>, |
| I extends IInterface> extends BasePendingRequest<S, I> { |
| private static final String TAG = MyAsyncPendingRequest.class.getSimpleName(); |
| |
| private final AsyncRequest<I> mRequest; |
| |
| protected MyAsyncPendingRequest(@NonNull S service, @NonNull AsyncRequest<I> request) { |
| super(service); |
| |
| mRequest = request; |
| } |
| |
| @Override |
| public void run() { |
| final S remoteService = getService(); |
| if (remoteService == null) return; |
| try { |
| mRequest.run(remoteService.mService); |
| } catch (RemoteException e) { |
| Slog.w(TAG, "exception handling async request (" + this + "): " + e); |
| } finally { |
| finish(); |
| } |
| } |
| } |
| } |
