1 files changed, 94 insertions, 0 deletions
diff --git a/simple/simple-http/src/main/java/org/simpleframework/http/core/Timer.java b/simple/simple-http/src/main/java/org/simpleframework/http/core/Timer.java
new file mode 100644
index 0000000..c07d49b
--- /dev/null
+++ b/simple/simple-http/src/main/java/org/simpleframework/http/core/Timer.java
@@ -0,0 +1,94 @@
+/*
+ * Timer.java November 2012
+ *
+ * Copyright (C) 2012, Niall Gallagher <niallg@users.sf.net>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
+ * implied. See the License for the specific language governing 
+ * permissions and limitations under the License.
+ */
+
+package org.simpleframework.http.core;
+
+import static java.lang.System.currentTimeMillis;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * The <code>Timer<code> object is used to set the time a specific
+ * event occurred at. The time can be set only once from that point 
+ * on all attempts to set the time are ignored. This makes this 
+ * timer useful when there is a desire to record when a certain
+ * scenario was first encountered, for example when a request is
+ * first read from the underlying transport.  
+ * 
+ * @author Niall Gallagher
+ */
+class Timer {
+
+   /**
+    * This is the time unit that this timer provides the time in.
+    */
+   private TimeUnit unit;
+   
+   /**
+    * This is the time in milliseconds used to record the event.
+    */
+   private volatile long time;
+   
+   /**
+    * Constructor for the <code>Timer</code> object. This is used
+    * to record when a specific event occurs. The provided time 
+    * unit is used to determine how the time is retrieved.
+    * 
+    * @param unit this time unit this timer will be using
+    */
+   public Timer(TimeUnit unit) {
+      this.unit = unit;
+      this.time = -1L;
+   }
+   
+   /**
+    * This is used to determine if the timer has been set. If 
+    * the <code>set</code> method has been called on this instance
+    * before then this will return true, otherwise false.
+    * 
+    * @return this returns true if the timer has been set
+    */
+   public boolean isSet() {
+      return time > 0;
+   }
+ 
+   /**
+    * This is used to set the time for a specific event. Invoking
+    * this method multiple times will have no effect as the time
+    * is set for the first invocation only. Setting the time in 
+    * this manner enables start times to be recorded effectively.     
+    */
+   public void set() {
+      if(time < 0) {
+         time = currentTimeMillis();
+      }
+   }
+   
+   /**
+    * This is used to get the time for a specific event. The time
+    * returned by this method is given in the time unit specified
+    * on construction of the instance.
+    * 
+    * @return this returns the time recorded by the timer
+    */
+   public long get() {
+      return unit.convert(time, MILLISECONDS);
+   }
+}
+ 
+\ No newline at end of file