Integrate Upstream r 1862/63: purge all purgable caches from Cache Table Browser

git-svn-id: https://svn.libreccm.org/ccm/trunk@142 8810af33-2d31-482b-a856-94f89814c4df

ccm-core/src/com/arsdigita/bebop/PageState.java

@@ -25,7 +25,9 @@ import com.arsdigita.bebop.util.Traversal;
 import com.arsdigita.dispatcher.DispatcherHelper;
 import com.arsdigita.developersupport.DeveloperSupport;
 import com.arsdigita.util.Assert;
+import com.arsdigita.util.UncheckedWrapperException;
 import com.arsdigita.web.ParameterMap;
+import com.arsdigita.web.RedirectSignal;
 import com.arsdigita.web.URL;
 import com.arsdigita.web.Web;
 import com.arsdigita.xml.Element;
@@ -406,16 +408,6 @@ public class PageState {
         return m_response;
     }
 
-    /**
-     * Return the page component with index i from the page model.
-     *
-     * @pre (i>=0) && (i < size())
-     * @post return != null
-     */
-    private Component getComponent(int i) {
-        return m_page.getComponent(i);
-    }
-
     /**
      * The index of a component in the page model
      *
@@ -496,7 +488,7 @@ public class PageState {
      */
     public void setVisible(final Component c, final boolean v) {
         if (Assert.isEnabled()) {
-            Assert.truth(getPage().stateContains(c),
+            Assert.isTrue(getPage().stateContains(c),
                          "Component" + c + " is not registered on Page " +
                          getPage());
         }
@@ -703,7 +695,7 @@ public class PageState {
      * @pre c == null || getPage().stateContains(c)
      */
     public void setControlEvent(Component c, String name, String value) {
-        Assert.assertTrue(c == null || getPage().stateContains(c),
+        Assert.isTrue(c == null || getPage().stateContains(c),
                           "c == null || getPage().stateContains(c)");
         if ( m_grabbingComponent != null && m_grabbingComponent != c ) {
             throw new IllegalStateException
@@ -1070,4 +1062,22 @@ public class PageState {
             + "}";
         return result;
     }
+    
+    /**
+     * Clear the control event then redirect to the new page state.
+     * 
+     * @param isCommitRequested indicates if a commit required before the redirect
+     * 
+     * @throws RedirectSignal to the new page state
+     * 
+     * @see RedirectSignal#RedirectSignal(String, boolean)
+     */
+    public void redirectWithoutControlEvent(boolean isCommitRequested) {
+        clearControlEvent();
+        try {
+            throw new RedirectSignal(stateAsURL(), true);
+        } catch (IOException ioe) {
+            throw new UncheckedWrapperException(ioe);
+        }
+    }
 }

ccm-core/src/com/arsdigita/caching/CacheServlet.java

@@ -63,6 +63,7 @@ public class CacheServlet extends HttpServlet {
     private static final String ID = "id";
     private static final String KEY = "key";
     private static final String HASH = "hash";
+    private static final String REMOVEALL = "removeAll";
 
     // If you change this, make sure that web.xml is changed as well
     static final String SERVLET_URL = "/expireCache";
@@ -74,15 +75,42 @@ public class CacheServlet extends HttpServlet {
     protected void doGet( HttpServletRequest req, HttpServletResponse res ) {
         String id = req.getParameter( ID );
         String key = req.getParameter( KEY );     
+        String removeAll = req.getParameter( REMOVEALL );
         
         if (s_log.isInfoEnabled()) {
             s_log.info("Got remove request from " + req.getRemoteHost());
         }
 
-        if (id == null || key == null) {
+        if (id != null && key != null){
-            return;
+          //normal expire cache entry request
+          if (s_log.isInfoEnabled()) {
+              s_log.info("Got remove request from " + req.getRemoteHost());
           }  
             
+          String hash = req.getParameter( HASH );
+          expireCacheEntry(id, key, hash);
+        } else if (id != null && key == null && removeAll != null) {
+           //purge a single cache request
+           if (s_log.isInfoEnabled()) {
+              s_log.info("Got remove all entries request from " + req.getRemoteHost());
+           } 
+           if(removeAll.equals("true")){ 
+               removeCacheEntries(id); 
+           }
+        } else if (id == null && key == null && removeAll != null) {
+            //purge all caches request
+            if (s_log.isInfoEnabled()) {
+                s_log.info("Got remove all cache request from " + req.getRemoteHost());
+            }
+            if(removeAll.equals("true")){ 
+                removeAllCache(); 
+            }
+        } else {
+            s_log.error("Got an invalid cache request from " + req.getRemoteHost());
+        }
+    }
+    
+    protected void expireCacheEntry(String id, String key, String hash) {
         id = URLDecoder.decode(id);
         key = URLDecoder.decode(key);
 
@@ -94,7 +122,6 @@ public class CacheServlet extends HttpServlet {
 
         s_log.debug("Removing " + key + " from cache " + id);
 
-        final String hash = req.getParameter( HASH );
         final Integer hashCode = getHashCode(hash);
         if (hashCode == null) {
             // unconditionally remove
@@ -104,6 +131,25 @@ public class CacheServlet extends HttpServlet {
         }
     }
 
+    protected void removeCacheEntries(String id) {
+        id = URLDecoder.decode(id);
+        final CacheTable cache = CacheTable.getCache( id );
+        if (cache == null) {
+            s_log.debug("No cache with id " + id);
+            return;
+        }
+
+        s_log.debug("Removing all entries from cache " + id);
+        // unconditionally remove
+        cache.removeAllEntriesLocally();
+    }
+    
+    protected void removeAllCache() {
+        s_log.debug("Removing all Cache tables");
+        // unconditionally remove all
+        CacheTable.removeAllCacheTablesLocally();
+    }
+    
     private Integer getHashCode(final String hash) {
         if (hash == null) {
             return null;
@@ -135,6 +181,32 @@ public class CacheServlet extends HttpServlet {
     }
 
  
+    /**
+     * remote all entries from all purge-able tables in the peer's.
+     * 
+     * The fact that there is no ID parameter tells the 
+     * peers to purge all cache tables. 
+     */
+    static void removeAllFromPeers() {
+        final ParameterMap params = new ParameterMap();
+        params.setParameter(REMOVEALL, "true");
+        
+        notifyPeers(params);
+    }
+    
+    /**
+     * remote all entries from the peer's cache table with an id of cacheID.
+     * 
+     * @param cacheID id of the cache table to purge
+     */
+    static void removeAllEntriesFromPeersTable(String cacheID) {
+        final ParameterMap params = new ParameterMap();
+        params.setParameter(ID, cacheID);
+        params.setParameter(REMOVEALL, "true");
+        
+        notifyPeers(params);
+    }
+    
     /**
      *  Sometimes we need to remove entries only from peer webservers.
      */
@@ -159,6 +231,10 @@ public class CacheServlet extends HttpServlet {
     private static void notifyPeers(final String id,
                                     final String key,
                                     final String hash) {    
+        notifyPeers(makeParameterMap(id, key, hash));
+    }
+    
+    private static void notifyPeers(ParameterMap params) {
         if (!Web.getConfig().getDeactivateCacheHostNotifications()) {
             s_log.debug("about to notify peers");
             final Session session = SessionManager.getSession();
@@ -174,7 +250,7 @@ public class CacheServlet extends HttpServlet {
             f.set("currPort", new Integer(current.getPort()));
             while (hosts.next()) {
                 final Host host = (Host) hosts.getDomainObject();
-                notifyPeer(host, makeParameterMap(id, key, hash));
+                notifyPeer(host, params);
             }
         }
     }

ccm-core/src/com/arsdigita/caching/CacheTable.java

@@ -27,6 +27,7 @@ import java.math.BigDecimal;
 import java.util.Date;
 import java.util.HashSet;
 import java.util.Hashtable;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -237,11 +238,6 @@ public class CacheTable {
         return purgeAllowed;
     }
     
-    private void removeLRUEntry() {
-        m_list.removeLRUEntry();
-    }
-
-
     /**
      * A convenience wrapper around {@link #put(String, Object)}.
      *
@@ -425,6 +421,39 @@ public class CacheTable {
     }
 
 
+    public synchronized void removeAllEntriesLocally() {
+        m_list.clear();
+        
+        if (s_log.isDebugEnabled()) {
+            s_log.debug("removed all entries from cache table " + m_cacheID);
+        } 
+    }
+    
+    public static void removeAllCacheTables() {
+        if (s_log.isDebugEnabled()) {
+            s_log.debug("remove all entries from all purge-able cache tables");
+        }
+        removeAllCacheTablesLocally();
+        CacheServlet.removeAllFromPeers();
+    }
+        
+    /**
+     *  Iterator over all CacheTables in the cache 
+     *  and clear all purge-able ones
+     */
+    public static synchronized void removeAllCacheTablesLocally() {
+        for(Iterator it = s_caches.values().iterator(); it.hasNext(); ) {
+            CacheTable ct = (CacheTable)it.next();
+            if (ct.isPurgeAllowed()) {
+                ct.removeAll();
+                if (s_log.isDebugEnabled()) {
+                    s_log.debug("removed all entries from cache table " + ct.m_cacheID);
+                }                
+            }
+        }
+    }
+    
+    
     /**
      *  <p> Retrieves the object stored in cache.  If no object by the
      * passed key can be found in cache (maybe because it's expired or
@@ -468,6 +497,7 @@ public class CacheTable {
         String isShared(String tableID);
         boolean isPurgeAllowed(String tableID);
         void purge(String tableID);
+        void purgeAll();
     }
 
     private static class BrowserImpl implements Browser {
@@ -510,6 +540,10 @@ public class CacheTable {
             table.removeAll();
         }
         
+        public void purgeAll() {
+            CacheTable.removeAllCacheTables();
+        }
+        
         private static CacheTable getCacheTable(String tableID) {
             if ( tableID==null ) { throw new NullPointerException(); }
 

ccm-core/src/com/arsdigita/webdevsupport/CacheTableBrowser.java

@@ -18,19 +18,6 @@
  */
 package com.arsdigita.webdevsupport;
 
-import com.arsdigita.bebop.ControlLink;
-import com.arsdigita.bebop.Label;
-import com.arsdigita.bebop.PageState;
-import com.arsdigita.bebop.SimpleContainer;
-import com.arsdigita.bebop.Table;
-import com.arsdigita.bebop.event.TableActionEvent;
-import com.arsdigita.bebop.event.TableActionListener;
-import com.arsdigita.bebop.table.TableModel;
-import com.arsdigita.bebop.table.TableModelBuilder;
-import com.arsdigita.caching.CacheTable;
-import com.arsdigita.caching.CacheTable.TimestampedEntry;
-import com.arsdigita.util.LockableImpl;
-
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -40,6 +27,23 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 
+import com.arsdigita.bebop.ActionLink;
+import com.arsdigita.bebop.ControlLink;
+import com.arsdigita.bebop.Label;
+import com.arsdigita.bebop.ListPanel;
+import com.arsdigita.bebop.PageState;
+import com.arsdigita.bebop.SimpleContainer;
+import com.arsdigita.bebop.Table;
+import com.arsdigita.bebop.event.ActionEvent;
+import com.arsdigita.bebop.event.ActionListener;
+import com.arsdigita.bebop.event.TableActionEvent;
+import com.arsdigita.bebop.event.TableActionListener;
+import com.arsdigita.bebop.table.TableModel;
+import com.arsdigita.bebop.table.TableModelBuilder;
+import com.arsdigita.caching.CacheTable;
+import com.arsdigita.caching.CacheTable.TimestampedEntry;
+import com.arsdigita.util.LockableImpl;
+
 
 /**
  * @author  Vadim Nasardinov (vadimn@redhat.com)
@@ -64,15 +68,27 @@ final class CacheTableBrowser extends SimpleContainer {
                     break;
                 case 5:
                     CacheTable.BROWSER.purge((String) ev.getRowKey());
-  	              	break;
+                    ev.getPageState().redirectWithoutControlEvent(false);
                 default:
                     break;
                 }
             }
 
-                public void headSelected(TableActionEvent e) { }
+            public void headSelected(TableActionEvent e) {
+            }
         });
 
+        ActionLink purgeAllLink = new ActionLink("Purge all caches");
+        purgeAllLink.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                CacheTable.BROWSER.purgeAll();
+                e.getPageState().redirectWithoutControlEvent(false);
+            }
+        });
+        ListPanel container = new ListPanel(false);
+        container.add(purgeAllLink);        
+        add(container);
+        
         add(m_listOfTables);
         add(m_tableContents);
     }
@@ -137,7 +153,11 @@ final class CacheTableBrowser extends SimpleContainer {
                     return String.valueOf(CacheTable.BROWSER.isShared(m_key));
                 case 5:
                     if (CacheTable.BROWSER.isPurgeAllowed(m_key)) {
+                        if (CacheTable.BROWSER.getCurrentSize(m_key) > 0) {
                             return new ControlLink(new Label("purge"));
+                        } else {
+                            return new Label("(empty)");
+                        }
                     } else {
                       return new Label("can't be purged");
                     }
@@ -161,8 +181,6 @@ final class CacheTableBrowser extends SimpleContainer {
         private final static String TABLE_ID_ATTR =
             CacheTableContents.class.getName();
 
-        private String m_tableID;
-
         public CacheTableContents() {
             super(new ModelBuilder(),
                   new String[] { "Key", "Class", "Value", "Hits", "Hash code", "Timestamp" });