content: /**
   * 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.solr.core;
  
  import org.apache.solr.common.SolrException;
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.search.SolrIndexSearcher;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.List;
  import java.util.ArrayList;
  
  /**
   */
  class RunExecutableListener extends AbstractSolrEventListener {
    public RunExecutableListener(SolrCore core) {
      super(core);
    }
    protected String[] cmd;
    protected File dir;
    protected String[] envp;
    protected boolean wait=true;
  
    @Override
    public void init(NamedList args) {
      super.init(args);
  
      List cmdlist = new ArrayList();
      cmdlist.add(args.get("exe"));
      List lst = (List)args.get("args");
      if (lst != null) cmdlist.addAll(lst);
      cmd = (String[])cmdlist.toArray(new String[cmdlist.size()]);
  
      lst = (List)args.get("env");
      if (lst != null) {
        envp = (String[])lst.toArray(new String[lst.size()]);
      }
  
      String str = (String)args.get("dir");
      if (str==null || str.equals("") || str.equals(".") || str.equals("./")) {
        dir = null;
      } else {
        dir = new File(str);
      }
  
      if ("false".equals(args.get("wait")) || Boolean.FALSE.equals(args.get("wait"))) wait=false;
    }
  
    /**
     * External executable listener.
     * 
     * @param callback Unused (As of solr 1.4-dev)
     * @return Error code indicating if the command has executed successfully. <br />
     *  0 , indicates normal termination.<br />
     *  non-zero , otherwise.
     */
    protected int exec(String callback) {
      int ret = 0;
  
      try {
        boolean doLog = log.isDebugEnabled();
        if (doLog) {
          log.debug("About to exec " + cmd[0]);
        }
        Process proc = Runtime.getRuntime().exec(cmd, envp ,dir);
  
        if (wait) {
          try {
            ret = proc.waitFor();
          } catch (InterruptedException e) {
            SolrException.log(log,e);
            ret = INVALID_PROCESS_RETURN_CODE;
          }
        }
  
        if (wait && doLog) {
          log.debug("Executable " + cmd[0] + " returned " + ret);
        }
  
      } catch (IOException e) {
        // don't throw exception, just log it...
        SolrException.log(log,e);
        ret = INVALID_PROCESS_RETURN_CODE;
      }
  
      return ret;
    }
  
  
    @Override
    public void postCommit() {
      // anything generic need to be passed to the external program?
      // the directory of the index?  the command that caused it to be
      // invoked?  the version of the index?
      exec("postCommit");
    }
  
    @Override
    public void newSearcher(SolrIndexSearcher newSearcher, SolrIndexSearcher currentSearcher) {
      exec("newSearcher");
    }
  
    /** Non-zero value for an invalid return code **/
    private static int INVALID_PROCESS_RETURN_CODE = -1;
  
  }
  