Cooja event queue. Ported from MSPSim

tools/cooja/java/se/sics/cooja/EventQueue.java

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+/*
+ * Copyright (c) 2008, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: EventQueue.java,v 1.1 2008/10/28 12:52:24 fros4943 Exp $
+ */
+
+package se.sics.cooja;
+
+/**
+ * @author Joakim Eriksson (ported to COOJA by Fredrik Österlind)
+ */
+public class EventQueue {
+
+  private TimeEvent first;
+  private int nextTime;
+  private int eventCount = 0;
+
+  public EventQueue() {
+  }
+
+  public void addEvent(TimeEvent event, int time) {
+    event.time = time;
+    addEvent(event);
+  }
+
+  public void addEvent(TimeEvent event) {
+    if (event.scheduledIn != null) {
+      event.remove();
+    }
+    if (first == null) {
+      first = event;
+    } else {
+      TimeEvent pos = first;
+      TimeEvent lastPos = first;
+      while (pos != null && pos.time <= event.time) {
+        lastPos = pos;
+        pos = pos.nextEvent;
+      }
+      // Here pos will be the first TE after event
+      // and lastPos the first before
+      if (pos == first) {
+        // Before all other
+        event.nextEvent = pos;
+        first = event;
+      } else {
+        event.nextEvent = pos;
+        lastPos.nextEvent = event;
+      }
+    }
+    if (first != null) {
+      nextTime = first.time;
+    } else {
+      nextTime = 0;
+    }
+    event.scheduledIn = this;
+    eventCount++;
+  }
+
+  // Not yet impl.
+  public boolean removeEvent(TimeEvent event) {
+    TimeEvent pos = first;
+    TimeEvent lastPos = first;
+//  System.out.println("Removing: " + event.getShort() + "  Before remove: ");
+//  print();
+    while (pos != null && pos != event) {
+      lastPos = pos;
+      pos = pos.nextEvent;
+    }
+    if (pos == null) {
+      return false;
+    }
+    // pos == event!
+    if (pos == first) {
+      // remove it from first pos.
+      first = pos.nextEvent;
+    } else {
+      // else link prev to next...
+      lastPos.nextEvent = pos.nextEvent;
+    }
+    // unlink
+    pos.nextEvent = null;
+
+    if (first != null) {
+      nextTime = first.time;
+    } else {
+      nextTime = 0;
+    }
+//  System.out.println("Removed =>");
+//  print();
+    event.scheduledIn = null;
+    eventCount--;
+    return true;
+  }
+
+  public TimeEvent popFirst() {
+    TimeEvent tmp = first;
+    if (tmp == null) {
+      return null;
+    }
+
+    first = tmp.nextEvent;
+    // Unlink.
+    tmp.nextEvent = null;
+
+    if (first != null) {
+      nextTime = first.time;
+    } else {
+      nextTime = 0;
+    }
+    // No longer scheduled!
+    tmp.scheduledIn = null;
+    eventCount--;
+    return tmp;
+  }
+
+  public void removeAll() {
+    TimeEvent t = first;
+    while(t != null) {
+      TimeEvent clr = t;
+      t = t.nextEvent;
+      clr.nextEvent = null;
+      clr.time = 0;
+      clr.scheduledIn = null;
+    }
+    first = null;
+    eventCount = 0;
+  }
+
+  public String toString() {
+    return "EventQueue (" + eventCount + " events)";
+  }
+} // LLEventQueue