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package net.jxta.impl.util;


import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageElement;
import net.jxta.endpoint.MessageFilterListener;

import java.util.Enumeration;
import java.util.Hashtable;


/**
 * Instances of this clas can be registered with an EndpointService
 * to gather statistics about what kind of messages pass through it.
 * 

* This class is not MT-safe, so make sure you plug it only * into one endpoint service. * * @see net.jxta.endpoint.EndpointService#addIncomingMessageFilterListener */ public class EndpointServiceStatsFilter implements MessageFilterListener { long lastMessageTime; Hashtable channelTrafficTable; Hashtable sourceCountTable; Hashtable destCountTable; public EndpointServiceStatsFilter() { channelTrafficTable = new Hashtable(); sourceCountTable = new Hashtable(); destCountTable = new Hashtable(); } /** * This method is called by the EndpointService to give us a chance * to look at the message before it is dispatched to any listeners. */ public Message filterMessage(Message msg, EndpointAddress source, EndpointAddress dest) { Message.ElementIterator e = msg.getMessageElements(); MessageElement el; String namespace; String name; while (e.hasNext()) { el = e.next(); namespace = e.getNamespace(); name = el.getElementName(); incrementCount(channelTrafficTable, source.getProtocolName() + "://" + source.getProtocolAddress() + "/" + namespace , (int) el.getByteLength()); incrementCount(channelTrafficTable, source.getProtocolName() + "://" + source.getProtocolAddress() + "/" + name , (int) el.getByteLength()); } if (source != null) { incrementCount(sourceCountTable, source, 1); } if (dest != null) { incrementCount(destCountTable, dest, 1); } lastMessageTime = System.currentTimeMillis(); return msg; } /** * Get the time we last saw a message. * * @return time last message was received, in milliseconds, * since Jan. 1, 1970. */ public long getLastMessageTime() { return lastMessageTime; } /** * Get the number of messages seen with a given message element * namespace or full message element name. (Both are referred * to as "channel" here because filters and listeners are * dispatched by the EndpointService based on message element * namespaces or fully name.) */ public long getTrafficOnChannel(String channel) { return getCount(channelTrafficTable, channel); } public Enumeration getChannelNames() { return channelTrafficTable.keys(); } /** * Get the number of messages received from a given address. */ public long getMessageCountFrom(EndpointAddress addr) { return getCount(sourceCountTable, addr); } /** * Get the number of messages we've seen that were adderssed * to a given address. */ public long getMessageCountTo(EndpointAddress addr) { return getCount(destCountTable, addr); } private long getCount(Hashtable table, Object key) { Counter counter = (Counter) table.get(key); return counter == null ? -1 : counter.value; } private void incrementCount(Hashtable table, Object key, int incr) { Counter counter = (Counter) table.get(key); if (counter == null) { counter = new Counter(); table.put(key, counter); } counter.value += incr; } private static final class Counter { long value; } }





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