| /* |
| * Copyright (C) 2015 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.server.pm; |
| |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.ServiceConnection; |
| import android.content.pm.EphemeralResolveInfo; |
| import android.os.Build; |
| import android.os.Bundle; |
| import android.os.IBinder; |
| import android.os.IRemoteCallback; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.TimedRemoteCaller; |
| |
| import com.android.internal.app.EphemeralResolverService; |
| import com.android.internal.app.IEphemeralResolver; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * Represents a remote ephemeral resolver. It is responsible for binding to the remote |
| * service and handling all interactions in a timely manner. |
| * @hide |
| */ |
| final class EphemeralResolverConnection { |
| // This is running in a critical section and the timeout must be sufficiently low |
| private static final long BIND_SERVICE_TIMEOUT_MS = |
| ("eng".equals(Build.TYPE)) ? 300 : 200; |
| |
| private final Object mLock = new Object(); |
| private final GetEphemeralResolveInfoCaller mGetEphemeralResolveInfoCaller = |
| new GetEphemeralResolveInfoCaller(); |
| private final ServiceConnection mServiceConnection = new MyServiceConnection(); |
| private final Context mContext; |
| /** Intent used to bind to the service */ |
| private final Intent mIntent; |
| |
| private IEphemeralResolver mRemoteInstance; |
| |
| public EphemeralResolverConnection(Context context, ComponentName componentName) { |
| mContext = context; |
| mIntent = new Intent().setComponent(componentName); |
| } |
| |
| public final List<EphemeralResolveInfo> getEphemeralResolveInfoList( |
| int hashPrefix[], int prefixMask) { |
| throwIfCalledOnMainThread(); |
| try { |
| return mGetEphemeralResolveInfoCaller.getEphemeralResolveInfoList( |
| getRemoteInstanceLazy(), hashPrefix, prefixMask); |
| } catch (RemoteException re) { |
| } catch (TimeoutException te) { |
| } finally { |
| synchronized (mLock) { |
| mLock.notifyAll(); |
| } |
| } |
| return null; |
| } |
| |
| public void dump(FileDescriptor fd, PrintWriter pw, String prefix) { |
| synchronized (mLock) { |
| pw.append(prefix).append("bound=") |
| .append((mRemoteInstance != null) ? "true" : "false").println(); |
| |
| pw.flush(); |
| |
| try { |
| getRemoteInstanceLazy().asBinder().dump(fd, new String[] { prefix }); |
| } catch (TimeoutException te) { |
| /* ignore */ |
| } catch (RemoteException re) { |
| /* ignore */ |
| } |
| } |
| } |
| |
| private IEphemeralResolver getRemoteInstanceLazy() throws TimeoutException { |
| synchronized (mLock) { |
| if (mRemoteInstance != null) { |
| return mRemoteInstance; |
| } |
| bindLocked(); |
| return mRemoteInstance; |
| } |
| } |
| |
| private void bindLocked() throws TimeoutException { |
| if (mRemoteInstance != null) { |
| return; |
| } |
| |
| mContext.bindServiceAsUser(mIntent, mServiceConnection, |
| Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE, UserHandle.SYSTEM); |
| |
| final long startMillis = SystemClock.uptimeMillis(); |
| while (true) { |
| if (mRemoteInstance != null) { |
| break; |
| } |
| final long elapsedMillis = SystemClock.uptimeMillis() - startMillis; |
| final long remainingMillis = BIND_SERVICE_TIMEOUT_MS - elapsedMillis; |
| if (remainingMillis <= 0) { |
| throw new TimeoutException("Didn't bind to resolver in time."); |
| } |
| try { |
| mLock.wait(remainingMillis); |
| } catch (InterruptedException ie) { |
| /* ignore */ |
| } |
| } |
| |
| mLock.notifyAll(); |
| } |
| |
| private void throwIfCalledOnMainThread() { |
| if (Thread.currentThread() == mContext.getMainLooper().getThread()) { |
| throw new RuntimeException("Cannot invoke on the main thread"); |
| } |
| } |
| |
| private final class MyServiceConnection implements ServiceConnection { |
| @Override |
| public void onServiceConnected(ComponentName name, IBinder service) { |
| synchronized (mLock) { |
| mRemoteInstance = IEphemeralResolver.Stub.asInterface(service); |
| mLock.notifyAll(); |
| } |
| } |
| |
| @Override |
| public void onServiceDisconnected(ComponentName name) { |
| synchronized (mLock) { |
| mRemoteInstance = null; |
| } |
| } |
| } |
| |
| private static final class GetEphemeralResolveInfoCaller |
| extends TimedRemoteCaller<List<EphemeralResolveInfo>> { |
| private final IRemoteCallback mCallback; |
| |
| public GetEphemeralResolveInfoCaller() { |
| super(TimedRemoteCaller.DEFAULT_CALL_TIMEOUT_MILLIS); |
| mCallback = new IRemoteCallback.Stub() { |
| @Override |
| public void sendResult(Bundle data) throws RemoteException { |
| final ArrayList<EphemeralResolveInfo> resolveList = |
| data.getParcelableArrayList( |
| EphemeralResolverService.EXTRA_RESOLVE_INFO); |
| int sequence = |
| data.getInt(EphemeralResolverService.EXTRA_SEQUENCE, -1); |
| onRemoteMethodResult(resolveList, sequence); |
| } |
| }; |
| } |
| |
| public List<EphemeralResolveInfo> getEphemeralResolveInfoList( |
| IEphemeralResolver target, int hashPrefix[], int prefixMask) |
| throws RemoteException, TimeoutException { |
| final int sequence = onBeforeRemoteCall(); |
| target.getEphemeralResolveInfoList(mCallback, hashPrefix, prefixMask, sequence); |
| return getResultTimed(sequence); |
| } |
| } |
| } |