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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 static com.google.gerrit.common.data.GlobalCapability.FLUSH_CACHES;
import static com.google.gerrit.common.data.GlobalCapability.MAINTAIN_SERVER;
import static com.google.gerrit.server.restapi.config.PostCaches.Operation.FLUSH;
import static com.google.gerrit.server.restapi.config.PostCaches.Operation.FLUSH_ALL;
import static com.google.gerrit.sshd.CommandMetaData.Mode.MASTER_OR_SLAVE;
import com.google.gerrit.extensions.annotations.RequiresAnyCapability;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.server.config.ConfigResource;
import com.google.gerrit.server.restapi.config.ListCaches;
import com.google.gerrit.server.restapi.config.ListCaches.OutputFormat;
import com.google.gerrit.server.restapi.config.PostCaches;
import com.google.gerrit.sshd.CommandMetaData;
import com.google.gerrit.sshd.SshCommand;
import com.google.inject.Inject;
import java.util.ArrayList;
import java.util.List;
import org.kohsuke.args4j.Option;
/** Causes the caches to purge all entries and reload. */
@RequiresAnyCapability({FLUSH_CACHES, MAINTAIN_SERVER})
@CommandMetaData(
name = "flush-caches",
description = "Flush some/all server caches from memory",
runsAt = MASTER_OR_SLAVE)
final class FlushCaches extends SshCommand {
@Option(name = "--cache", usage = "flush named cache", metaVar = "NAME")
private List<String> caches = new ArrayList<>();
@Option(name = "--all", usage = "flush all caches")
private boolean all;
@Option(name = "--list", usage = "list available caches")
private boolean list;
@Inject private ListCaches listCaches;
@Inject private PostCaches postCaches;
@Override
protected void run() throws Failure {
enableGracefulStop();
try {
if (list) {
if (all || !caches.isEmpty()) {
throw die("cannot use --list with --all or --cache");
}
doList();
return;
}
if (all && !caches.isEmpty()) {
throw die("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;
}
if (all) {
postCaches.apply(new ConfigResource(), new PostCaches.Input(FLUSH_ALL));
} else {
postCaches.apply(new ConfigResource(), new PostCaches.Input(FLUSH, caches));
}
} catch (RestApiException e) {
throw die(e.getMessage());
} catch (Exception e) {
throw new Failure(1, "unavailable", e);
}
}
@SuppressWarnings("unchecked")
private void doList() throws Exception {
for (String name :
(List<String>)
listCaches.setFormat(OutputFormat.LIST).apply(new ConfigResource()).value()) {
stderr.print(name);
stderr.print('\n');
}
stderr.flush();
}
}