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/*
* Copyright 2022 Google LLC
*
* 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.google.android.libraries.mobiledatadownload.populator;
import android.content.Context;
import android.content.SharedPreferences;
import com.google.mobiledatadownload.populator.MetadataProto.ManifestFileBookkeeping;
import com.google.android.libraries.mobiledatadownload.internal.util.SharedPreferencesUtil;
import com.google.android.libraries.mobiledatadownload.tracing.PropagatedFutures;
import com.google.common.base.Optional;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.util.concurrent.ListenableFuture;
import java.io.IOException;
import java.util.concurrent.Executor;
/** ManifestFileMetadataStore based on SharedPreferences. */
public final class SharedPreferencesManifestFileMetadata implements ManifestFileMetadataStore {
private static final String SHARED_PREFS_NAME = "ManifestFileMetadata";
private final Object lock = new Object();
private final Supplier<SharedPreferences> sharedPrefs;
private final Executor backgroundExecutor;
/**
* @param sharedPrefs may be called multiple times, so memoization is recommended
*/
public static SharedPreferencesManifestFileMetadata create(
Supplier<SharedPreferences> sharedPrefs, Executor backgroundExecutor) {
return new SharedPreferencesManifestFileMetadata(sharedPrefs, backgroundExecutor);
}
public static SharedPreferencesManifestFileMetadata createFromContext(
Context context, Optional<String> instanceIdOptional, Executor backgroundExecutor) {
// Avoid calling getSharedPreferences on the main thread.
Supplier<SharedPreferences> sharedPrefs =
Suppliers.memoize(
() ->
SharedPreferencesUtil.getSharedPreferences(
context, SHARED_PREFS_NAME, instanceIdOptional));
return new SharedPreferencesManifestFileMetadata(sharedPrefs, backgroundExecutor);
}
private SharedPreferencesManifestFileMetadata(
Supplier<SharedPreferences> sharedPrefs, Executor backgroundExecutor) {
this.sharedPrefs = sharedPrefs;
this.backgroundExecutor = backgroundExecutor;
}
@Override
public ListenableFuture<Optional<ManifestFileBookkeeping>> read(String manifestId) {
return PropagatedFutures.submit(
() -> {
synchronized (lock) {
ManifestFileBookkeeping proto =
SharedPreferencesUtil.readProto(
sharedPrefs.get(), manifestId, ManifestFileBookkeeping.parser());
return Optional.fromNullable(proto);
}
},
backgroundExecutor);
}
@Override
public ListenableFuture<Void> upsert(String manifestId, ManifestFileBookkeeping value) {
return PropagatedFutures.submit(
() -> {
synchronized (lock) {
SharedPreferences.Editor editor = sharedPrefs.get().edit();
SharedPreferencesUtil.writeProto(editor, manifestId, value);
if (!editor.commit()) {
throw new IOException("Failed to commit");
}
return null; // for Callable
}
},
backgroundExecutor);
}
}
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