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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.net;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.telephony.data.EpsBearerQosSessionAttributes;
import android.telephony.data.NrQosSessionAttributes;
import com.android.internal.annotations.VisibleForTesting;
import java.util.Objects;
import java.util.concurrent.Executor;
/**
* Sends messages from {@link com.android.server.ConnectivityService} to the registered
* {@link QosCallback}.
* <p/>
* This is a satellite class of {@link ConnectivityManager} and not meant
* to be used in other contexts.
*
* @hide
*/
class QosCallbackConnection extends android.net.IQosCallback.Stub {
@NonNull private final ConnectivityManager mConnectivityManager;
@Nullable private volatile QosCallback mCallback;
@NonNull private final Executor mExecutor;
@VisibleForTesting
@Nullable
public QosCallback getCallback() {
return mCallback;
}
/**
* The constructor for the connection
*
* @param connectivityManager the mgr that created this connection
* @param callback the callback to send messages back to
* @param executor The executor on which the callback will be invoked. The provided
* {@link Executor} must run callback sequentially, otherwise the order of
* callbacks cannot be guaranteed.
*/
QosCallbackConnection(@NonNull final ConnectivityManager connectivityManager,
@NonNull final QosCallback callback,
@NonNull final Executor executor) {
mConnectivityManager = Objects.requireNonNull(connectivityManager,
"connectivityManager must be non-null");
mCallback = Objects.requireNonNull(callback, "callback must be non-null");
mExecutor = Objects.requireNonNull(executor, "executor must be non-null");
}
/**
* Called when either the {@link EpsBearerQosSessionAttributes} has changed or on the first time
* the attributes have become available.
*
* @param session the session that is now available
* @param attributes the corresponding attributes of session
*/
@Override
public void onQosEpsBearerSessionAvailable(@NonNull final QosSession session,
@NonNull final EpsBearerQosSessionAttributes attributes) {
mExecutor.execute(() -> {
final QosCallback callback = mCallback;
if (callback != null) {
callback.onQosSessionAvailable(session, attributes);
}
});
}
/**
* Called when either the {@link NrQosSessionAttributes} has changed or on the first time
* the attributes have become available.
*
* @param session the session that is now available
* @param attributes the corresponding attributes of session
*/
@Override
public void onNrQosSessionAvailable(@NonNull final QosSession session,
@NonNull final NrQosSessionAttributes attributes) {
mExecutor.execute(() -> {
final QosCallback callback = mCallback;
if (callback != null) {
callback.onQosSessionAvailable(session, attributes);
}
});
}
/**
* Called when the session is lost.
*
* @param session the session that was lost
*/
@Override
public void onQosSessionLost(@NonNull final QosSession session) {
mExecutor.execute(() -> {
final QosCallback callback = mCallback;
if (callback != null) {
callback.onQosSessionLost(session);
}
});
}
/**
* Called when there is an error on the registered callback.
*
* @param errorType the type of error
*/
@Override
public void onError(@QosCallbackException.ExceptionType final int errorType) {
mExecutor.execute(() -> {
final QosCallback callback = mCallback;
if (callback != null) {
// Messages no longer need to be received since there was an error.
stopReceivingMessages();
mConnectivityManager.unregisterQosCallback(callback);
callback.onError(QosCallbackException.createException(errorType));
}
});
}
/**
* The callback will stop receiving messages.
* <p/>
* There are no synchronization guarantees on exactly when the callback will stop receiving
* messages.
*/
void stopReceivingMessages() {
mCallback = null;
}
}
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