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/*
* Copyright (C) 2020 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 static com.android.internal.annotations.VisibleForTesting.Visibility.PACKAGE;
import android.annotation.NonNull;
import android.app.ActivityThread.ActivityClientRecord;
import android.app.ClientTransactionHandler;
import android.os.IBinder;
import com.android.internal.annotations.VisibleForTesting;
/**
* An activity-targeting callback message to a client that can be scheduled and executed.
* It also provides nullity-free version of
* {@link #execute(ClientTransactionHandler, IBinder, PendingTransactionActions)} for child class
* to inherit.
*
* @see ClientTransaction
* @see ClientTransactionItem
* @see com.android.server.wm.ClientLifecycleManager
* @hide
*/
public abstract class ActivityTransactionItem extends ClientTransactionItem {
@Override
public final void execute(ClientTransactionHandler client, IBinder token,
PendingTransactionActions pendingActions) {
final ActivityClientRecord r = getActivityClientRecord(client, token);
execute(client, r, pendingActions);
}
/**
* Like {@link #execute(ClientTransactionHandler, IBinder, PendingTransactionActions)},
* but take non-null {@link ActivityClientRecord} as a parameter.
*/
@VisibleForTesting(visibility = PACKAGE)
public abstract void execute(@NonNull ClientTransactionHandler client,
@NonNull ActivityClientRecord r, PendingTransactionActions pendingActions);
@NonNull ActivityClientRecord getActivityClientRecord(
@NonNull ClientTransactionHandler client, IBinder token) {
return getActivityClientRecord(client, token, false /* includeLaunching */);
}
/**
* Gets the {@link ActivityClientRecord} instance that corresponds to the provided token.
* @param client Target client handler.
* @param token Target activity token.
* @param includeLaunching Indicate to find the {@link ActivityClientRecord} in launching
* activity list.
* <p>Note that there is no {@link android.app.Activity} instance in
* {@link ActivityClientRecord} from the launching activity list.
* @return The {@link ActivityClientRecord} instance that corresponds to the provided token.
*/
@NonNull ActivityClientRecord getActivityClientRecord(
@NonNull ClientTransactionHandler client, IBinder token, boolean includeLaunching) {
ActivityClientRecord r = null;
// Check launching Activity first to prevent race condition that activity instance has not
// yet set to ActivityClientRecord.
if (includeLaunching) {
r = client.getLaunchingActivity(token);
}
// Then if we don't want to find launching Activity or the ActivityClientRecord doesn't
// exist in launching Activity list. The ActivityClientRecord should have been initialized
// and put in the Activity list.
if (r == null) {
r = client.getActivityClient(token);
if (r != null && client.getActivity(token) == null) {
throw new IllegalArgumentException("Activity must not be null to execute "
+ "transaction item");
}
}
if (r == null) {
throw new IllegalArgumentException("Activity client record must not be null to execute "
+ "transaction item");
}
return r;
}
}
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