HADOOP-2297 System.exit() Handling in hbase shell jar command

Forgot to add new files in last commit


git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@599714 13f79535-47bb-0310-9956-ffa450edef68

src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/ExitException.java

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+/**
+ * Copyright 2007 The Apache Software Foundation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.hadoop.hbase.shell;
+
+public class ExitException extends SecurityException {
+  private static final long serialVersionUID = -8085525076856622991L;
+  /** Status code */
+  private int status;
+
+  /**
+   * Constructs an exit exception.
+   * 
+   * @param status the status code returned via System.exit()
+   */
+  public ExitException(int status) {
+    this.status = status;
+  }
+
+  /**
+   * The status code returned by System.exit()
+   * 
+   * @return the status code returned by System.exit()
+   */
+  public int getStatus() {
+    return status;
+  }
+}

src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/ShellSecurityManager.java

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+/**
+ * Copyright 2007 The Apache Software Foundation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.hadoop.hbase.shell;
+
+import java.io.IOException;
+import java.security.Permission;
+
+import org.apache.hadoop.hbase.Shell;
+
+/**
+ * This is intended as a replacement for the default system manager. The goal is
+ * to intercept System.exit calls and make it throw an exception instead so that
+ * a System.exit in a jar command program does not fully terminate Shell.
+ * 
+ * @see ExitException
+ */
+public class ShellSecurityManager extends SecurityManager {
+
+  /**
+   * Override SecurityManager#checkExit. This throws an ExitException(status)
+   * exception.
+   * 
+   * @param status the exit status
+   */
+  @SuppressWarnings("static-access")
+  public void checkExit(int status) {
+    if (status != 9999) {
+      // throw new ExitException(status);
+
+      // I didn't figure out How can catch the ExitException in shell main.
+      // So, I just Re-launching the shell.
+      Shell shell = new Shell();
+      String[] args = new String[] { String.valueOf(status) };
+      try {
+        shell.main(args);
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
+  /**
+   * Override SecurityManager#checkPermission. This does nothing.
+   * 
+   * @param perm the requested permission.
+   */
+  public void checkPermission(Permission perm) {
+  }
+}