1 files changed, 108 insertions, 0 deletions
diff --git a/java/com/google/gerrit/pgm/util/AbstractProgram.java b/java/com/google/gerrit/pgm/util/AbstractProgram.java
new file mode 100644
index 0000000000..fca5551ecd
--- /dev/null
+++ b/java/com/google/gerrit/pgm/util/AbstractProgram.java
@@ -0,0 +1,108 @@
+// 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.util;
+
+import com.google.gerrit.common.Die;
+import com.google.gerrit.util.cli.CmdLineParser;
+import com.google.gerrit.util.cli.OptionHandlers;
+import java.io.StringWriter;
+import org.kohsuke.args4j.CmdLineException;
+import org.kohsuke.args4j.Option;
+
+/** 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 = "--show-stack-trace", usage = "display stack trace on failure")
+  protected boolean showStackTrace;
+
+  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(String[] argv) throws Exception {
+    final CmdLineParser clp = new CmdLineParser(OptionHandlers.empty(), this);
+    try {
+      clp.parseArgument(argv);
+    } catch (CmdLineException err) {
+      if (!clp.wasHelpRequestedByOption()) {
+        System.err.println("fatal: " + err.getMessage());
+        return 1;
+      }
+    }
+
+    if (clp.wasHelpRequestedByOption()) {
+      StringWriter msg = new StringWriter();
+      clp.printDetailedUsage(getName(), msg);
+      System.err.println(msg.toString());
+      return 1;
+    }
+
+    try {
+      ProxyUtil.configureHttpProxy();
+      return run();
+    } catch (Die err) {
+      if (showStackTrace) {
+        err.printStackTrace();
+      } else {
+        final Throwable cause = err.getCause();
+        final String diemsg = err.getMessage();
+        if (cause != null && !cause.getMessage().equals(diemsg)) {
+          System.err.println("fatal: " + cause.getMessage().replaceAll("\n", "\nfatal: "));
+        }
+        System.err.println("fatal: " + diemsg.replaceAll("\n", "\nfatal: "));
+      }
+      return 128;
+    }
+  }
+
+  /** Create a new exception to indicate we won't continue. */
+  protected static Die die(String why) {
+    return new Die(why);
+  }
+
+  /** Create a new exception to indicate we won't continue. */
+  protected static Die die(String why, Throwable cause) {
+    return new Die(why, cause);
+  }
+
+  /** 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;
+}