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// Copyright (C) 2009 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.pgm;
import com.google.gerrit.util.cli.CmdLineParser;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.Option;
import java.io.StringWriter;
import java.util.Collections;
/** Base class for command line invocations of Gerrit Code Review. */
public abstract class AbstractProgram {
private final Object sleepLock = new Object();
private boolean running = true;
@Option(name = "--help", usage = "display this help text", aliases = {"-h"})
private boolean help;
private String getName() {
String n = getClass().getName();
int dot = n.lastIndexOf('.');
if (0 < dot) {
n = n.substring(dot + 1);
}
return n.toLowerCase();
}
public final int main(final String[] argv) throws Exception {
final Injector empty = emptyInjector();
final CmdLineParser clp = new CmdLineParser(empty, this);
try {
clp.parseArgument(argv);
} catch (CmdLineException err) {
if (!help) {
System.err.println("fatal: " + err.getMessage());
return 1;
}
}
if (help) {
final StringWriter msg = new StringWriter();
msg.write(getName());
clp.printSingleLineUsage(msg, null);
msg.write('\n');
msg.write('\n');
clp.printUsage(msg, null);
msg.write('\n');
System.err.println(msg.toString());
return 1;
}
return run();
}
private static Injector emptyInjector() {
return Guice.createInjector(Collections.<Module> emptyList());
}
/** Method that never returns, e.g. to keep a daemon running. */
protected int never() {
synchronized (sleepLock) {
while (running) {
try {
sleepLock.wait(60 * 60 * 1000L);
} catch (InterruptedException e) {
continue;
}
}
return 0;
}
}
/**
* Run this program's logic, returning the command exit status.
* <p>
* When this method completes, the JVM is terminated. To keep the JVM running,
* use {@code return never()}.
*/
public abstract int run() throws Exception;
}
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