109 lines
3.3 KiB
Java
109 lines
3.3 KiB
Java
// Copyright (C) 2009 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.pgm.util;
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import com.google.gerrit.common.Die;
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import com.google.gerrit.util.cli.CmdLineParser;
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import com.google.gerrit.util.cli.OptionHandlers;
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import java.io.StringWriter;
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import org.kohsuke.args4j.CmdLineException;
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import org.kohsuke.args4j.Option;
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/** Base class for command line invocations of Gerrit Code Review. */
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public abstract class AbstractProgram {
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private final Object sleepLock = new Object();
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private boolean running = true;
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@Option(name = "--show-stack-trace", usage = "display stack trace on failure")
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protected boolean showStackTrace;
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private String getName() {
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String n = getClass().getName();
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int dot = n.lastIndexOf('.');
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if (0 < dot) {
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n = n.substring(dot + 1);
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}
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return n.toLowerCase();
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}
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public final int main(String[] argv) throws Exception {
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final CmdLineParser clp = new CmdLineParser(OptionHandlers.empty(), this);
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try {
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clp.parseArgument(argv);
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} catch (CmdLineException err) {
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if (!clp.wasHelpRequestedByOption()) {
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System.err.println("fatal: " + err.getMessage());
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return 1;
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}
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}
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if (clp.wasHelpRequestedByOption()) {
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StringWriter msg = new StringWriter();
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clp.printDetailedUsage(getName(), msg);
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System.err.println(msg.toString());
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return 1;
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}
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try {
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ProxyUtil.configureHttpProxy();
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return run();
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} catch (Die err) {
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if (showStackTrace) {
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err.printStackTrace();
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} else {
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final Throwable cause = err.getCause();
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final String diemsg = err.getMessage();
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if (cause != null && !cause.getMessage().equals(diemsg)) {
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System.err.println("fatal: " + cause.getMessage().replaceAll("\n", "\nfatal: "));
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}
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System.err.println("fatal: " + diemsg.replaceAll("\n", "\nfatal: "));
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}
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return 128;
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}
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}
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/** Create a new exception to indicate we won't continue. */
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protected static Die die(String why) {
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return new Die(why);
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}
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/** Create a new exception to indicate we won't continue. */
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protected static Die die(String why, Throwable cause) {
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return new Die(why, cause);
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}
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/** Method that never returns, e.g. to keep a daemon running. */
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protected int never() {
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synchronized (sleepLock) {
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while (running) {
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try {
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sleepLock.wait(60 * 60 * 1000L);
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} catch (InterruptedException e) {
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continue;
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}
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}
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return 0;
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}
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}
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/**
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* Run this program's logic, returning the command exit status.
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*
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* <p>When this method completes, the JVM is terminated. To keep the JVM running, use {@code
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* return never()}.
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*/
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public abstract int run() throws Exception;
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}
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