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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2018 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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 org.pentaho.di.www;

import java.io.IOException;
import java.io.PrintStream;
import java.util.Date;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.pentaho.di.core.Const;
import org.pentaho.di.core.xml.XMLHandler;
import org.pentaho.di.i18n.BaseMessages;

public class GetSlavesServlet extends BaseHttpServlet implements CartePluginInterface {
  private static Class PKG = GetSlavesServlet.class; // for i18n purposes,
  // needed by
  // Translator2!!

  public static final String XML_TAG_SLAVESERVER_DETECTIONS = "SlaveServerDetections";

  private static final long serialVersionUID = -5472184538138241050L;
  public static final String CONTEXT_PATH = "/kettle/getSlaves";

  public GetSlavesServlet() {
  }

  public GetSlavesServlet( List slaveServers ) {
    super( slaveServers );
  }

  public GetSlavesServlet( List slaveServers, boolean isJetty ) {
    super( slaveServers, isJetty );
  }

  /**

    /kettle/getSlaves
    
    GET
    Gets list of slave servers.
  Retrieves list of slave servers which are known to specific server.

    Example Request:

    
    GET /kettle/getSlaves
    
    

  Response Body

  
    
      
        element:
        (custom)
      
      
        media types:
        text/xml
      
    
  
    Response contains list of slave servers.

    Example Response:
        
    
    
      
        Dynamic slave [localhost:909]localhost909
        clusterEncrypted 2be98afc86aa7f2e4cb1aa265cd86aac8
        N
      
      Y
      2014/11/17 06:42:28.043
      2014/11/17 06:42:27.372
    

  
    

    Status Codes
    
  
    
      code
      description
    
    
      200
      Request was processed.
    
    
      500
      Internal server error occurs during request processing.
    
  



  */
  public void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException,
    IOException {
    if ( isJettyMode() && !request.getContextPath().startsWith( CONTEXT_PATH ) ) {
      return;
    }

    if ( log.isDebug() ) {
      logDebug( BaseMessages.getString( PKG, "GetStatusServlet.StatusRequested" ) );
    }
    response.setStatus( HttpServletResponse.SC_OK );

    // We always reply in XML...
    //
    response.setContentType( "text/xml" );
    response.setCharacterEncoding( Const.XML_ENCODING );
    PrintStream out = new PrintStream( response.getOutputStream() );

    out.print( XMLHandler.getXMLHeader( Const.XML_ENCODING ) );
    out.println( XMLHandler.openTag( XML_TAG_SLAVESERVER_DETECTIONS ) );

    if ( getDetections() != null ) {
      for ( SlaveServerDetection slaveServer : getDetections() ) {
        try {
          slaveServer.getSlaveServer().getStatus();
        } catch ( Exception e ) {
          slaveServer.setActive( false );
          slaveServer.setLastInactiveDate( new Date() );
        }
        out.println( slaveServer.getXML() );
      }
    }

    out.println( XMLHandler.closeTag( XML_TAG_SLAVESERVER_DETECTIONS ) );

  }

  public String toString() {
    return "Get list of slave servers";
  }

  public String getService() {
    return CONTEXT_PATH + " (" + toString() + ")";
  }

  public String getContextPath() {
    return CONTEXT_PATH;
  }

}
code	description
200	Request was processed.
500	Internal server error occurs during request processing.