ovidiu 02/04/09 17:38:01
Modified: src/scratchpad/schecoon/src/org/apache/cocoon/components/flow
WebContinuation.java
Log:
Added support for the last access time. Pass an additional
time-to-live argument when creating a WebContinuation.
Revision Changes Path
1.4 +55 -7
xml-cocoon2/src/scratchpad/schecoon/src/org/apache/cocoon/components/flow/WebContinuation.java
Index: WebContinuation.java
===================================================================
RCS file:
/home/cvs/xml-cocoon2/src/scratchpad/schecoon/src/org/apache/cocoon/components/flow/WebContinuation.java,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- WebContinuation.java 2 Apr 2002 05:02:25 -0000 1.3
+++ WebContinuation.java 10 Apr 2002 00:38:01 -0000 1.4
@@ -1,6 +1,8 @@
package org.apache.cocoon.components.flow;
+import java.lang.Comparable;
import java.util.ArrayList;
+import java.util.Date;
import java.util.List;
/**
@@ -19,11 +21,12 @@
* @since March 19, 2002
*/
public class WebContinuation
+ implements Comparable
{
/**
* The continuation this object represents.
*/
- Object continuation;
+ protected Object continuation;
/**
* The parent <code>WebContinuation</code> from which processing
@@ -35,19 +38,19 @@
*
* @see ContinuationsManager
*/
- WebContinuation parentContinuation;
+ protected WebContinuation parentContinuation;
/**
* The children continuations. These are continuations created by
* resuming the processing from the point stored by
* <code>continuation</code>.
*/
- List children = new ArrayList();
+ protected List children = new ArrayList();
/**
* The continuation id used to represent this instance in Web pages.
*/
- String id;
+ protected String id;
/**
* A user definable object. This is present for convenience, to
@@ -55,7 +58,21 @@
* <code>WebContinuation</code> a particular implementation might
* need.
*/
- Object userObject;
+ protected Object userObject;
+
+ /**
+ * When was this continuation accessed last time. Each time the
+ * continuation is accessed, this time is set to the time of the
+ * access.
+ */
+ protected long lastAccessTime;
+
+ /**
+ * Indicates how long does this continuation will live (in
+ * seconds). The continuation will be removed once the current time
+ * is bigger than <code>lastAccessTime + timeToLive</code>.
+ */
+ protected int timeToLive;
/**
* Create a <code>WebContinuation</code> object. Saves the object in
@@ -69,11 +86,13 @@
*/
public WebContinuation(Object continuation,
WebContinuation parentContinuation,
- ContinuationsManagerImpl manager)
+ ContinuationsManagerImpl manager,
+ int timeToLive)
{
this.continuation = continuation;
this.parentContinuation = parentContinuation;
id = manager.generateContinuationId(this);
+ this.timeToLive = timeToLive;
if (parentContinuation != null)
this.parentContinuation.children.add(this);
}
@@ -85,6 +104,7 @@
*/
public Object getContinuation()
{
+ updateLastAccessTime();
return continuation;
}
@@ -101,8 +121,10 @@
*/
public WebContinuation getContinuation(int level)
{
- if (level <= 0)
+ if (level <= 0) {
+ updateLastAccessTime();
return this;
+ }
else if (parentContinuation == null)
return this;
else
@@ -187,6 +209,24 @@
}
/**
+ * Compares the expiration time of this instance with that of the
+ * WebContinuation passed as argument.
+ *
+ * <p><b>Note:</b> this class has a natural ordering that is
+ * inconsistent with <code>equals</code>.</p>.
+ *
+ * @param other an <code>Object</code> value, which should be a
+ * <code>WebContinuation</code> instance
+ * @return an <code>int</code> value
+ */
+ public int compareTo(Object other)
+ {
+ WebContinuation wk = (WebContinuation)other;
+ return (int)((lastAccessTime + timeToLive)
+ - (wk.lastAccessTime + wk.timeToLive));
+ }
+
+ /**
* Debugging method.
*
* <p>Assumes the receiving instance as the root of a tree and
@@ -219,5 +259,13 @@
depth++;
for (int i = 0; i < size; i++)
((WebContinuation)children.get(i)).display(depth);
+ }
+
+ /**
+ * Update the continuation in the
+ */
+ protected void updateLastAccessTime()
+ {
+ lastAccessTime = (new Date()).getTime();
}
}
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