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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.gerrit.sshd.AdminCommand;
import net.sf.ehcache.Ehcache;
import org.apache.sshd.server.Environment;
import org.kohsuke.args4j.Option;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedSet;
/** Causes the caches to purge all entries and reload. */
@AdminCommand
final class AdminFlushCaches extends CacheCommand {
@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;
private PrintWriter p;
@Override
public void start(final Environment env) {
startThread(new CommandRunnable() {
@Override
public void run() throws Exception {
parseCommandLine();
flush();
}
});
}
private void flush() throws Failure {
p = toPrintWriter(err);
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()) {
p.print(name);
p.print('\n');
}
p.flush();
}
private void doBulkFlush() {
try {
for (final Ehcache c : getAllCaches()) {
final String name = c.getName();
if (flush(name)) {
try {
c.removeAll();
} catch (Throwable e) {
p.println("error: cannot flush cache \"" + name + "\": " + e);
}
}
}
} finally {
p.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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