/***************************************************************************
* *
* RetrieveNetwork.java *
* ------------------- *
* date : 15.09.2004 *
* copyright : (C) 2004-2008 Distributed and *
* Mobile Systems Group *
* Lehrstuhl fuer Praktische Informatik *
* Universitaet Bamberg *
* http://www.uni-bamberg.de/pi/ *
* email : sven.kaffille@uni-bamberg.de *
* karsten.loesing@uni-bamberg.de *
* *
* *
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* A copy of the license can be found in the license.txt file supplied *
* with this software or at: http://www.gnu.org/copyleft/gpl.html *
* *
***************************************************************************/
package de.uniba.wiai.lspi.chord.console.command;
import de.uniba.wiai.lspi.chord.console.command.entry.Key;
import de.uniba.wiai.lspi.chord.service.Chord;
import de.uniba.wiai.lspi.util.console.Command;
import de.uniba.wiai.lspi.util.console.ConsoleException;
import java.io.Serializable;
import java.util.Set;
/**
* <p>
* {@link Command} to retrieve a value from the remote chord network.
* </p>
* To get a description of this command type <code>retrieveN -help</code>
* into the {@link de.uniba.wiai.lspi.chord.console.Main console}.
* @author sven
* @version 1.0.5
*/
public class RetrieveNetwork extends Command {
/**
* The name of this {@link Command}.
*/
public static final String COMMAND_NAME = "retrieveN";
/**
* The name of the parameter, that defines the key to be retrieved.
*/
protected static final String KEY_PARAM = "key";
/** Creates a new instance of Retrieve
* @param toCommand1
* @param out1 */
public RetrieveNetwork(Object[] toCommand1, java.io.PrintStream out1) {
super(toCommand1, out1);
}
public void exec() throws ConsoleException {
String key = this.parameters.get(KEY_PARAM);
if ( (key == null) || (key.length() == 0) ){
throw new ConsoleException("Not enough parameters! " + KEY_PARAM + " is missing.");
}
Key keyObject = new Key(key);
Chord chord = ((RemoteChordNetworkAccess)this.toCommand[1]).getChordInstance();
try {
Set<Serializable> vs = chord.retrieve(keyObject);
Object[] values = vs.toArray(new Object[vs.size()]);
this.out.println("Values associated with key '" + key + "': ");
for (int i = 0; i < values.length; i++) {
this.out.print(values[i]);
if ( !(i == (values.length-1)) ) {
this.out.print(",");
}
this.out.print(" ");
}
this.out.println();
}
catch (Throwable t){
ConsoleException e = new ConsoleException("Exception during execution of command. " + t.getMessage());
e.setStackTrace(t.getStackTrace());
throw e;
}
}
public String getCommandName() {
return COMMAND_NAME;
}
public void printOutHelp() {
this.out.println("This command retrieves and displays the values stored for a provided key in the chord network.");
this.out.println("The search is initiated by the node provided as parameter.");
this.out.println("Required parameters: ");
this.out.println("\t" + KEY_PARAM + ": The key for the values.");
this.out.println();
}
}