KeyedAppStatesCallbackMerger.java
/*
* Copyright 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 androidx.enterprise.feedback;
import androidx.annotation.Nullable;
/**
* Merge multiple {@link KeyedAppStatesCallback} instances into a single one.
*
* <p>This will report success once {@code numReceivers} success results have been received.
*
* <p>It will report an error once a single non-success result is received.
*/
class KeyedAppStatesCallbackMerger implements KeyedAppStatesCallback {
private boolean mHasReported = false;
private int mSuccesses;
private final int mNumReceivers;
private final KeyedAppStatesCallback mOriginalCallback;
KeyedAppStatesCallbackMerger(int numReceivers, KeyedAppStatesCallback originalCallback) {
mNumReceivers = numReceivers;
mOriginalCallback = originalCallback;
if (mNumReceivers == 0) {
mHasReported = true;
mOriginalCallback.onResult(STATUS_SUCCESS, /* throwable= */ null);
}
}
@Override
public void onResult(int state, @Nullable Throwable throwable) {
if (mHasReported) {
// Only report once
return;
}
if (state != STATUS_SUCCESS || ++mSuccesses >= mNumReceivers) {
mHasReported = true;
mOriginalCallback.onResult(state, throwable);
}
}
}