com.gemstone.org.jgroups.protocols.DEADLOCK Maven / Gradle / Ivy
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/** Notice of modification as required by the LGPL
* This file was modified by Gemstone Systems Inc. on
* $Date$
**/
// $Id: DEADLOCK.java,v 1.7 2005/08/08 12:45:42 belaban Exp $
package com.gemstone.org.jgroups.protocols;
import com.gemstone.org.jgroups.Address;
import com.gemstone.org.jgroups.Event;
import com.gemstone.org.jgroups.View;
import com.gemstone.org.jgroups.blocks.GroupRequest;
import com.gemstone.org.jgroups.blocks.MethodCall;
import com.gemstone.org.jgroups.stack.RpcProtocol;
import com.gemstone.org.jgroups.util.ExternalStrings;
import com.gemstone.org.jgroups.util.RspList;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
class MyFrame extends Frame {
private static final long serialVersionUID = -5091554906224946278L;
final List list=new List();
final Label result=new Label("Result: ");
final Button send=new Button("Send Request");
final Button quit=new Button("Quit");
final Panel button_panel=new Panel();
final Panel main_panel=new Panel();
DEADLOCK deadlock=null;
Vector members=null;
MyFrame(String title, DEADLOCK deadlock) {
this.deadlock=deadlock;
setSize(300, 200);
setTitle(title);
setBackground(Color.white);
setFont(new Font("Helvetica", Font.PLAIN, 12));
setLayout(new BorderLayout());
main_panel.setLayout(new GridLayout(0, 2));
main_panel.add(result);
main_panel.add(list);
button_panel.add(send);
button_panel.add(quit);
add("Center", main_panel);
add("South", button_panel);
addEventHandlers();
}
void addEventHandlers() {
quit.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {dispose();}
});
send.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
Address dest;
int res;
int index=-1;
index=list.getSelectedIndex();
if(index == -1)
return;
dest=members != null ? (Address)members.elementAt(index) : null;
if(dest != null) {
res=deadlock.sendRequest(dest);
setResult(res);
}
}
});
}
void setResult(int res) {
result.setText("Result: " + res);
}
void setMembers(Vector members) {
list.removeAll();
for(int i=0; i < members.size(); i++)
list.add(members.elementAt(i).toString());
this.members=members;
}
}
/**
Tests the deadlock detection mechanism of RequestCorrelator.
*/
public class DEADLOCK extends RpcProtocol {
MyFrame frame=null;
@Override // GemStoneAddition
public String getName() {return "DEADLOCK";}
@Override // GemStoneAddition
public void start() throws Exception {
super.start();
if(_corr != null)
_corr.setDeadlockDetection(true);
else
log.error(ExternalStrings.DEADLOCK_CANNOT_SET_DEADLOCK_DETECTION_IN_CORR_AS_IT_IS_NULL_);
frame=new MyFrame(getName(), this);
frame.show();
}
@Override // GemStoneAddition
public void stop() {
super.stop();
if(frame != null) {
frame.dispose();
frame=null;
}
}
public int sendRequest(Address dest) {
Object retval;
try {
System.out.println("--> getCombinedResults() to " + dest);
retval=callRemoteMethod(dest, "getCombinedResults", GroupRequest.GET_FIRST, 0);
}
catch(Exception e) {
return -1;
}
if(retval != null && retval instanceof Integer)
return ((Integer)retval).intValue();
return -1;
}
/* ------------------------- Request handler methods ----------------------------- */
/** Mcasts getResult() to all members (including itself). Returns the sum of all results. */
public int getCombinedResults() {
RspList rsp_list;
Vector results;
int retval=0;
System.out.println("<-- getCombinedResults()");
System.out.println("--> getResult() to " + members);
MethodCall call = new MethodCall("getResult", new Object[] {}, new String[] {});
rsp_list=callRemoteMethods(members, call, GroupRequest.GET_ALL, 0);
results=rsp_list.getResults();
for(int i=0; i < results.size(); i++)
retval+=((Integer)results.elementAt(i)).intValue();
return retval;
}
/** Returns a random integer value between 1 and 10 */
public static int getResult() {
System.out.println("<-- getResult()");
return (int)((Math.random() * 10) % 10) + 1;
}
/* --------------------- End of Request handler methods -------------------------- */
/**
* Callback. Called by superclass when event may be handled.
* Do not use PassUp in this method as the event is passed up
* by default by the superclass after this method returns !
* @return boolean Defaults to true. If false, event will not be passed up the stack.
*/
@Override // GemStoneAddition
public boolean handleUpEvent(Event evt) {
switch(evt.getType()) {
case Event.TMP_VIEW:
case Event.VIEW_CHANGE:
Vector new_members=((View)evt.getArg()).getMembers();
synchronized(members) {
members.removeAllElements();
if(new_members != null && new_members.size() > 0)
for(int i=0; i < new_members.size(); i++)
members.addElement(new_members.elementAt(i));
}
frame.setMembers(members);
break;
case Event.SET_LOCAL_ADDRESS:
frame.setTitle(frame.getTitle() + ": " + evt.getArg().toString());
break;
}
return true;
}
/**
Callback. Called by superclass when event may be handled.
Do not use PassDown in this method as the event is passed down
by default by the superclass after this method returns !
@return boolean Defaults to true. If false, event will not be passed down the stack.
*/
@Override // GemStoneAddition
public boolean handleDownEvent(Event evt) {
switch(evt.getType()) {
case Event.TMP_VIEW:
case Event.VIEW_CHANGE:
Vector new_members=((View)evt.getArg()).getMembers();
synchronized(members) {
members.removeAllElements();
if(new_members != null && new_members.size() > 0)
for(int i=0; i < new_members.size(); i++)
members.addElement(new_members.elementAt(i));
}
System.out.println("Setting members");
frame.setMembers(members);
System.out.println("done");
break;
}
return true;
}
}