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package org.glassfish.jersey.examples.jersey_ejb.resources;
import org.glassfish.jersey.examples.jersey_ejb.entities.Message;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import javax.ejb.Singleton;
/**
* An EJB singleton to maintain all processed message beans.
*
* @author Pavel Bucek (pavel.bucek at oracle.com)
*/
@Singleton
public class MessageHolderSingletonBean {
private List<Message> list = new CopyOnWriteArrayList<Message>();
private int maxMessages = 10;
int currentId = 0;
public MessageHolderSingletonBean() {
// initial content
addMessage("msg0", new Date(0));
addMessage("msg1", new Date(1000));
addMessage("msg2", new Date(2000));
}
public List<Message> getMessages() {
List<Message> l = new LinkedList<Message>();
int index = 0;
while(index < list.size() && index < maxMessages) {
l.add(list.get(index));
index++;
}
return l;
}
private int getNewId() {
return currentId++;
}
public Message addMessage(String msg) {
return addMessage(msg, new Date());
}
private Message addMessage(String msg, Date date) {
Message m = new Message(date, msg, getNewId());
list.add(0, m);
return m;
}
public Message getMessage(int uniqueId) {
int index = 0;
Message m;
while(index < list.size()) {
if((m = list.get(index)).getUniqueId() == uniqueId)
return m;
index++;
}
return null;
}
public boolean deleteMessage(int uniqueId) {
int index = 0;
while(index < list.size()) {
if(list.get(index).getUniqueId() == uniqueId) {
list.remove(index);
return true;
}
index++;
}
return false;
}
}