| /* |
| * Copyright 2017 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 android.app.servertransaction; |
| |
| import android.annotation.Nullable; |
| import android.app.ClientTransactionHandler; |
| import android.app.IApplicationThread; |
| import android.os.IBinder; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.os.RemoteException; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * A container that holds a sequence of messages, which may be sent to a client. |
| * This includes a list of callbacks and a final lifecycle state. |
| * |
| * @see com.android.server.am.ClientLifecycleManager |
| * @see ClientTransactionItem |
| * @see ActivityLifecycleItem |
| * @hide |
| */ |
| public class ClientTransaction implements Parcelable, ObjectPoolItem { |
| |
| /** A list of individual callbacks to a client. */ |
| private List<ClientTransactionItem> mActivityCallbacks; |
| |
| /** |
| * Final lifecycle state in which the client activity should be after the transaction is |
| * executed. |
| */ |
| private ActivityLifecycleItem mLifecycleStateRequest; |
| |
| /** Target client. */ |
| private IApplicationThread mClient; |
| |
| /** Target client activity. Might be null if the entire transaction is targeting an app. */ |
| private IBinder mActivityToken; |
| |
| /** Get the target client of the transaction. */ |
| public IApplicationThread getClient() { |
| return mClient; |
| } |
| |
| /** |
| * Add a message to the end of the sequence of callbacks. |
| * @param activityCallback A single message that can contain a lifecycle request/callback. |
| */ |
| public void addCallback(ClientTransactionItem activityCallback) { |
| if (mActivityCallbacks == null) { |
| mActivityCallbacks = new ArrayList<>(); |
| } |
| mActivityCallbacks.add(activityCallback); |
| } |
| |
| /** Get the list of callbacks. */ |
| @Nullable |
| List<ClientTransactionItem> getCallbacks() { |
| return mActivityCallbacks; |
| } |
| |
| /** Get the target activity. */ |
| @Nullable |
| public IBinder getActivityToken() { |
| return mActivityToken; |
| } |
| |
| /** Get the target state lifecycle request. */ |
| ActivityLifecycleItem getLifecycleStateRequest() { |
| return mLifecycleStateRequest; |
| } |
| |
| /** |
| * Set the lifecycle state in which the client should be after executing the transaction. |
| * @param stateRequest A lifecycle request initialized with right parameters. |
| */ |
| public void setLifecycleStateRequest(ActivityLifecycleItem stateRequest) { |
| mLifecycleStateRequest = stateRequest; |
| } |
| |
| /** |
| * Do what needs to be done while the transaction is being scheduled on the client side. |
| * @param clientTransactionHandler Handler on the client side that will executed all operations |
| * requested by transaction items. |
| */ |
| public void preExecute(android.app.ClientTransactionHandler clientTransactionHandler) { |
| if (mActivityCallbacks != null) { |
| final int size = mActivityCallbacks.size(); |
| for (int i = 0; i < size; ++i) { |
| mActivityCallbacks.get(i).preExecute(clientTransactionHandler, mActivityToken); |
| } |
| } |
| if (mLifecycleStateRequest != null) { |
| mLifecycleStateRequest.preExecute(clientTransactionHandler, mActivityToken); |
| } |
| } |
| |
| /** |
| * Schedule the transaction after it was initialized. It will be send to client and all its |
| * individual parts will be applied in the following sequence: |
| * 1. The client calls {@link #preExecute(ClientTransactionHandler)}, which triggers all work |
| * that needs to be done before actually scheduling the transaction for callbacks and |
| * lifecycle state request. |
| * 2. The transaction message is scheduled. |
| * 3. The client calls {@link TransactionExecutor#execute(ClientTransaction)}, which executes |
| * all callbacks and necessary lifecycle transitions. |
| */ |
| public void schedule() throws RemoteException { |
| mClient.scheduleTransaction(this); |
| } |
| |
| |
| // ObjectPoolItem implementation |
| |
| private ClientTransaction() {} |
| |
| /** Obtain an instance initialized with provided params. */ |
| public static ClientTransaction obtain(IApplicationThread client, IBinder activityToken) { |
| ClientTransaction instance = ObjectPool.obtain(ClientTransaction.class); |
| if (instance == null) { |
| instance = new ClientTransaction(); |
| } |
| instance.mClient = client; |
| instance.mActivityToken = activityToken; |
| |
| return instance; |
| } |
| |
| @Override |
| public void recycle() { |
| if (mActivityCallbacks != null) { |
| int size = mActivityCallbacks.size(); |
| for (int i = 0; i < size; i++) { |
| mActivityCallbacks.get(i).recycle(); |
| } |
| mActivityCallbacks.clear(); |
| } |
| if (mLifecycleStateRequest != null) { |
| mLifecycleStateRequest.recycle(); |
| mLifecycleStateRequest = null; |
| } |
| mClient = null; |
| mActivityToken = null; |
| ObjectPool.recycle(this); |
| } |
| |
| |
| // Parcelable implementation |
| |
| /** Write to Parcel. */ |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| dest.writeStrongBinder(mClient.asBinder()); |
| final boolean writeActivityToken = mActivityToken != null; |
| dest.writeBoolean(writeActivityToken); |
| if (writeActivityToken) { |
| dest.writeStrongBinder(mActivityToken); |
| } |
| dest.writeParcelable(mLifecycleStateRequest, flags); |
| final boolean writeActivityCallbacks = mActivityCallbacks != null; |
| dest.writeBoolean(writeActivityCallbacks); |
| if (writeActivityCallbacks) { |
| dest.writeParcelableList(mActivityCallbacks, flags); |
| } |
| } |
| |
| /** Read from Parcel. */ |
| private ClientTransaction(Parcel in) { |
| mClient = (IApplicationThread) in.readStrongBinder(); |
| final boolean readActivityToken = in.readBoolean(); |
| if (readActivityToken) { |
| mActivityToken = in.readStrongBinder(); |
| } |
| mLifecycleStateRequest = in.readParcelable(getClass().getClassLoader()); |
| final boolean readActivityCallbacks = in.readBoolean(); |
| if (readActivityCallbacks) { |
| mActivityCallbacks = new ArrayList<>(); |
| in.readParcelableList(mActivityCallbacks, getClass().getClassLoader()); |
| } |
| } |
| |
| public static final Creator<ClientTransaction> CREATOR = |
| new Creator<ClientTransaction>() { |
| public ClientTransaction createFromParcel(Parcel in) { |
| return new ClientTransaction(in); |
| } |
| |
| public ClientTransaction[] newArray(int size) { |
| return new ClientTransaction[size]; |
| } |
| }; |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| final ClientTransaction other = (ClientTransaction) o; |
| return Objects.equals(mActivityCallbacks, other.mActivityCallbacks) |
| && Objects.equals(mLifecycleStateRequest, other.mLifecycleStateRequest) |
| && mClient == other.mClient |
| && mActivityToken == other.mActivityToken; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = 17; |
| result = 31 * result + Objects.hashCode(mActivityCallbacks); |
| result = 31 * result + Objects.hashCode(mLifecycleStateRequest); |
| return result; |
| } |
| } |