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// Copyright (C) 2016 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.google.gerrit.server.account.externalids;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.common.collect.SetMultimap;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.server.logging.TraceContext;
import com.google.gerrit.server.logging.TraceContext.TraceTimer;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
import java.io.IOException;
import java.util.Collection;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Consumer;
import org.eclipse.jgit.lib.ObjectId;
/** Caches external IDs of all accounts. The external IDs are always loaded from NoteDb. */
@Singleton
class ExternalIdCacheImpl implements ExternalIdCache {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static final String CACHE_NAME = "external_ids_map";
private final LoadingCache<ObjectId, AllExternalIds> extIdsByAccount;
private final ExternalIdReader externalIdReader;
private final Lock lock;
@Inject
ExternalIdCacheImpl(
@Named(CACHE_NAME) LoadingCache<ObjectId, AllExternalIds> extIdsByAccount,
ExternalIdReader externalIdReader) {
this.extIdsByAccount = extIdsByAccount;
this.externalIdReader = externalIdReader;
this.lock = new ReentrantLock(true /* fair */);
}
@Override
public void onReplace(
ObjectId oldNotesRev,
ObjectId newNotesRev,
Collection<ExternalId> toRemove,
Collection<ExternalId> toAdd) {
updateCache(
oldNotesRev,
newNotesRev,
m -> {
for (ExternalId extId : toRemove) {
m.remove(extId.accountId(), extId);
}
for (ExternalId extId : toAdd) {
extId.checkThatBlobIdIsSet();
m.put(extId.accountId(), extId);
}
});
}
@Override
public Set<ExternalId> byAccount(Account.Id accountId) throws IOException {
return get().byAccount().get(accountId);
}
@Override
public Set<ExternalId> byAccount(Account.Id accountId, ObjectId rev) throws IOException {
return get(rev).byAccount().get(accountId);
}
@Override
public SetMultimap<Account.Id, ExternalId> allByAccount() throws IOException {
return get().byAccount();
}
@Override
public SetMultimap<String, ExternalId> byEmails(String... emails) throws IOException {
AllExternalIds allExternalIds = get();
ImmutableSetMultimap.Builder<String, ExternalId> byEmails = ImmutableSetMultimap.builder();
for (String email : emails) {
byEmails.putAll(email, allExternalIds.byEmail().get(email));
}
return byEmails.build();
}
@Override
public SetMultimap<String, ExternalId> allByEmail() throws IOException {
return get().byEmail();
}
private AllExternalIds get() throws IOException {
return get(externalIdReader.readRevision());
}
private AllExternalIds get(ObjectId rev) throws IOException {
try {
return extIdsByAccount.get(rev);
} catch (ExecutionException e) {
throw new IOException("Cannot load external ids", e);
}
}
private void updateCache(
ObjectId oldNotesRev,
ObjectId newNotesRev,
Consumer<SetMultimap<Account.Id, ExternalId>> update) {
lock.lock();
try {
SetMultimap<Account.Id, ExternalId> m;
if (!ObjectId.zeroId().equals(oldNotesRev)) {
m =
MultimapBuilder.hashKeys()
.hashSetValues()
.build(extIdsByAccount.get(oldNotesRev).byAccount());
} else {
m = MultimapBuilder.hashKeys().hashSetValues().build();
}
update.accept(m);
extIdsByAccount.put(newNotesRev, AllExternalIds.create(m));
} catch (ExecutionException e) {
logger.atWarning().withCause(e).log("Cannot update external IDs");
} finally {
lock.unlock();
}
}
static class Loader extends CacheLoader<ObjectId, AllExternalIds> {
private final ExternalIdReader externalIdReader;
@Inject
Loader(ExternalIdReader externalIdReader) {
this.externalIdReader = externalIdReader;
}
@Override
public AllExternalIds load(ObjectId notesRev) throws Exception {
try (TraceTimer timer =
TraceContext.newTimer("Loading external IDs (revision=%s)", notesRev)) {
ImmutableSet<ExternalId> externalIds = externalIdReader.all(notesRev);
externalIds.forEach(ExternalId::checkThatBlobIdIsSet);
return AllExternalIds.create(externalIds);
}
}
}
}
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