Move TimedHashMap to netx

2011-02-15  Omair Majid  <[email protected]>

    * plugin/icedteanp/java/sun/applet/PluginProxySelector.java
    (TimedHashMap): Moved to...
    * netx/net/sourceforge/jnlp/util/TimedHashMap.java: New file.

1 files changed, 102 insertions, 0 deletions

diff --git a/netx/net/sourceforge/jnlp/util/TimedHashMap.java b/netx/net/sourceforge/jnlp/util/TimedHashMap.java
new file mode 100644
index 0000000..403378b
--- /dev/null
+++ b/netx/net/sourceforge/jnlp/util/TimedHashMap.java
@@ -0,0 +1,102 @@
+/* TimedHashMap.java
+   Copyright (C) 2011 Red Hat, Inc.
+
+This file is part of IcedTea.
+
+IcedTea is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+IcedTea is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with IcedTea; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package net.sourceforge.jnlp.util;
+
+import java.util.Date;
+import java.util.HashMap;
+
+import net.sourceforge.jnlp.runtime.JNLPRuntime;
+
+/**
+ * Simple utility class that extends HashMap by adding an expiry to the entries.
+ *
+ * This map stores entries, and returns them only if the entries were last accessed within time t=10 seconds
+ *
+ * @param <K> The key type
+ * @param <V> The Object type
+ */
+
+public class TimedHashMap<K, V> extends HashMap<K, V> {
+
+    HashMap<K, Long> timeStamps = new HashMap<K, Long>();
+    Long expiry = 10000L;
+
+    /**
+     * Store the item in the map and associate a timestamp with it
+     *
+     * @param key The key
+     * @param value The value to store
+     */
+    public V put(K key, V value) {
+        timeStamps.put(key, new Date().getTime());
+        return super.put(key, value);
+    }
+
+    /**
+     * Return cached item if it has not already expired.
+     *
+     * Before returning, this method also resets the "last accessed"
+     * time for this entry, so it is good for another 10 seconds
+     *
+     * @param key The key
+     */
+    @SuppressWarnings("unchecked")
+    public V get(Object key) {
+
+        Long now = new Date().getTime();
+
+        if (super.containsKey(key)) {
+            Long age = now - timeStamps.get(key);
+
+            // Item exists. If it has not expired, renew its access time and return it
+            if (age <= expiry) {
+                if (JNLPRuntime.isDebug()) {
+                    System.err.println("Returning proxy " + super.get(key) + " from cache for " + key);
+                }
+                timeStamps.put((K) key, (new Date()).getTime());
+                return super.get(key);
+            } else {
+                if (JNLPRuntime.isDebug()) {
+                    System.err.println("Proxy cache for " + key + " has expired (age=" + age / 1000.0 + " seconds)");
+                }
+            }
+        }
+
+        return null;
+    }
+}