/***************************************************************************
* *
* Insert.java *
* ------------------- *
* date : 15.09.2004, 10:14 *
* 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 java.net.MalformedURLException;
import de.uniba.wiai.lspi.chord.com.local.ChordImplAccess;
import de.uniba.wiai.lspi.chord.com.local.Registry;
import de.uniba.wiai.lspi.chord.com.local.ThreadEndpoint;
import de.uniba.wiai.lspi.chord.console.command.entry.Key;
import de.uniba.wiai.lspi.chord.console.command.entry.Value;
import de.uniba.wiai.lspi.chord.data.URL;
import de.uniba.wiai.lspi.util.console.ConsoleException;
/**
* Command to insert a value from a specified node into the local chord network.
*
* To get a description of this command type <code>insert -help</code> into
* the {@link de.uniba.wiai.lspi.chord.console.Main console}.
*
* @author sven
* @version 1.0.5
*/
public class Insert extends de.uniba.wiai.lspi.util.console.Command {
/**
* Name of this command.
*/
public static final String COMMAND_NAME = "insert";
/**
* The name of the parameter, that defines the name of the node, from that
* the value should be inserted.
*/
protected static final String NODE_PARAM = "node";
/**
* The name of the parameter, that defines the key for the value to insert.
*/
protected static final String KEY_PARAM = "key";
/**
* The name of the parameter, that defines the value, which is inserted into
* the distributed hash table.
*/
protected static final String VALUE_PARAM = "value";
/**
* Creates a new instance of Insert
*
* @param toCommand1
* @param out1
*/
public Insert(Object[] toCommand1, java.io.PrintStream out1) {
super(toCommand1, out1);
}
public void exec() throws ConsoleException {
String node = this.parameters.get(NODE_PARAM);
String key = this.parameters.get(KEY_PARAM);
String value = this.parameters.get(VALUE_PARAM);
if ((node == null) || (node.length() == 0)) {
throw new ConsoleException("Not enough parameters! " + NODE_PARAM
+ " is missing.");
}
if ((key == null) || (key.length() == 0)) {
throw new ConsoleException("Not enough parameters! " + KEY_PARAM
+ " is missing.");
}
if ((value == null) || (value.length() == 0)) {
throw new ConsoleException("Not enough parameters! " + VALUE_PARAM
+ " is missing.");
}
URL url = null;
try {
url = new URL(URL.KNOWN_PROTOCOLS.get(URL.LOCAL_PROTOCOL) + "://" + node + "/");
} catch (MalformedURLException e1) {
throw new ConsoleException(e1.getMessage());
}
Key keyObject = new Key(key);
Value valueObject = new Value(value);
ThreadEndpoint ep = Registry.getRegistryInstance().lookup(url);
if (ep == null) {
this.out.println("Node '" + node + "' does not exist!");
return;
}
try {
ChordImplAccess.fetchChordImplOfNode(ep.getNode()).insert(
keyObject, valueObject);
} catch (Throwable t) {
ConsoleException e = new ConsoleException(
"Exception during execution of command. " + t.getMessage());
e.setStackTrace(t.getStackTrace());
throw e;
}
this.out.println("Value '" + value + "' with key '" + key
+ "' inserted " + "successfully from node '" + node + "'.");
}
public String getCommandName() {
return COMMAND_NAME;
}
public void printOutHelp() {
this.out
.println("This command inserts a value with a provided key into the chord network.");
this.out
.println("The key is inserted starting from the node provided as parameter.");
this.out.println("Required parameters: ");
this.out.println("\t" + NODE_PARAM
+ ": The name of the node, from where the key is inserted.");
this.out.println("\t" + KEY_PARAM + ": The key for the value.");
this.out.println("\t" + VALUE_PARAM + ": The value to insert.");
this.out.println();
}
}