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+/*
+
+Copyright (c) Xerox Corporation 1998-2002. All rights reserved.
+
+Use and copying of this software and preparation of derivative works based
+upon this software are permitted. Any distribution of this software or
+derivative works must comply with all applicable United States export control
+laws.
+
+This software is made available AS IS, and Xerox Corporation makes no warranty
+about the software, its performance or its conformity to any specification.
+
+|<--- this code is formatted to fit into 80 columns --->|
+|<--- this code is formatted to fit into 80 columns --->|
+|<--- this code is formatted to fit into 80 columns --->|
+
+*/
+package telecom;
+
+/**
+ * The Timing aspect is concerned with the duration
+ * of connections and with customer's cumulative
+ * connection time.
+ */
+public aspect Timing {
+
+ /**
+ * Every Customer has a total connection time
+ */
+ public long Customer.totalConnectTime = 0;
+
+ public long getTotalConnectTime(Customer cust) {
+ return cust.totalConnectTime;
+ }
+ /**
+ * Every connection has a timer
+ */
+ private Timer Connection.timer = new Timer();
+ public Timer getTimer(Connection conn) { return conn.timer; }
+
+ /**
+ * Start the timer when call completed
+ */
+ after (Connection c): target(c) && call(void Connection.complete()) {
+ getTimer(c).start();
+ }
+
+ /**
+ * When to stop the timer
+ */
+ pointcut endTiming(Connection c): target(c) &&
+ call(void Connection.drop());
+
+ /**
+ * Stop the timer when call dropped and update the involved parties
+ */
+ after(Connection c): endTiming(c) {
+ getTimer(c).stop();
+ c.getCaller().totalConnectTime += getTimer(c).getTime();
+ c.getReceiver().totalConnectTime += getTimer(c).getTime();
+ }
+}