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// Copyright (C) 2008 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.sshd.commands;
import com.google.common.cache.Cache;
import com.google.gerrit.common.data.GlobalCapability;
import com.google.gerrit.extensions.annotations.RequiresCapability;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.sshd.BaseCommand;
import com.google.gerrit.sshd.CommandMetaData;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.kohsuke.args4j.Option;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
/** Causes the caches to purge all entries and reload. */
@RequiresCapability(GlobalCapability.FLUSH_CACHES)
@CommandMetaData(name = "flush-caches", descr = "Flush some/all server caches from memory")
final class FlushCaches extends CacheCommand {
private static final String WEB_SESSIONS = "web_sessions";
@Option(name = "--cache", usage = "flush named cache", metaVar = "NAME")
private List<String> caches = new ArrayList<String>();
@Option(name = "--all", usage = "flush all caches")
private boolean all;
@Option(name = "--list", usage = "list available caches")
private boolean list;
@Inject
IdentifiedUser currentUser;
@Override
protected void run() throws Failure {
if (caches.contains(WEB_SESSIONS)
&& !currentUser.getCapabilities().canAdministrateServer()) {
String msg = String.format(
"fatal: only site administrators can flush %s",
WEB_SESSIONS);
throw new UnloggedFailure(BaseCommand.STATUS_NOT_ADMIN, msg);
}
if (list) {
if (all || caches.size() > 0) {
throw error("error: cannot use --list with --all or --cache");
}
doList();
return;
}
if (all && caches.size() > 0) {
throw error("error: cannot combine --all and --cache");
} else if (!all && caches.size() == 1 && caches.contains("all")) {
caches.clear();
all = true;
} else if (!all && caches.isEmpty()) {
all = true;
}
final SortedSet<String> names = cacheNames();
for (final String n : caches) {
if (!names.contains(n)) {
throw error("error: cache \"" + n + "\" not recognized");
}
}
doBulkFlush();
}
private static UnloggedFailure error(final String msg) {
return new UnloggedFailure(1, msg);
}
private void doList() {
for (final String name : cacheNames()) {
stderr.print(name);
stderr.print('\n');
}
stderr.flush();
}
private void doBulkFlush() {
try {
for (String plugin : cacheMap.plugins()) {
for (Map.Entry<String, Provider<Cache<?, ?>>> entry :
cacheMap.byPlugin(plugin).entrySet()) {
String n = cacheNameOf(plugin, entry.getKey());
if (flush(n)) {
try {
entry.getValue().get().invalidateAll();
} catch (Throwable err) {
stderr.println("error: cannot flush cache \"" + n + "\": " + err);
}
}
}
}
} finally {
stderr.flush();
}
}
private boolean flush(final String cacheName) {
if (caches.contains(cacheName)) {
return true;
} else if (all) {
if (WEB_SESSIONS.equals(cacheName)) {
return false;
}
return true;
} else {
return false;
}
}
}
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