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/*
* Copyright (C) 2022 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.adservices.data.measurement;
import com.android.adservices.LogUtil;
import com.android.internal.annotations.VisibleForTesting;
import java.util.Optional;
/**
* Abstract class for Datastore management.
*/
public abstract class DatastoreManager {
/**
* Consumer interface for Dao operations.
*/
@FunctionalInterface
public interface ThrowingCheckedConsumer {
/**
* Performs the operation on {@link IMeasurementDao}.
*/
void accept(IMeasurementDao measurementDao) throws DatastoreException;
}
/**
* Function interface for Dao operations that returns {@link Output}.
*
* @param <Output> output type
*/
@FunctionalInterface
public interface ThrowingCheckedFunction<Output> {
/**
* Performs the operation on Dao.
*
* @return Output result of the operation
*/
Output apply(IMeasurementDao measurementDao) throws DatastoreException;
}
/**
* Creates a new transaction object for use in Dao.
*
* @return transaction
*/
protected abstract ITransaction createNewTransaction();
/**
* Acquire an instance of Dao object for querying the datastore.
*
* @return Dao object.
*/
@VisibleForTesting
public abstract IMeasurementDao getMeasurementDao();
/**
* Runs the {@code execute} lambda in a transaction.
*
* @param execute lambda to be executed in a transaction
* @param <T> the class for result
* @return Optional<T>, empty in case of an error, output otherwise
*/
public final <T> Optional<T> runInTransactionWithResult(ThrowingCheckedFunction<T> execute) {
IMeasurementDao measurementDao = getMeasurementDao();
ITransaction transaction = createNewTransaction();
if (transaction == null) {
return Optional.empty();
}
measurementDao.setTransaction(transaction);
transaction.begin();
Optional<T> result;
try {
result = Optional.of(execute.apply(measurementDao));
} catch (DatastoreException ex) {
result = Optional.empty();
LogUtil.e(ex, "DatastoreException thrown during transaction");
transaction.rollback();
} catch (Exception ex) {
// Catch all exceptions for rollback
LogUtil.e(ex, "Unhandled exception thrown during transaction");
transaction.rollback();
throw ex;
} finally {
transaction.end();
}
return result;
}
/**
* Runs the {@code execute} lambda in a transaction.
*
* @param execute lambda to be executed in transaction
* @return success true if execution succeeded, false otherwise
*/
public final boolean runInTransaction(ThrowingCheckedConsumer execute) {
return runInTransactionWithResult((measurementDao) -> {
execute.accept(measurementDao);
return true;
}).orElse(false);
}
}
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