A cache adapter for testing.

src/java/com/samskivert/depot/util/TestCacheAdapter.java

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+//
+// $Id$
+//
+// Depot library - a Java relational persistence library
+// Copyright (C) 2006-2008 Michael Bayne and Pär Winzell
+// 
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.depot.util;
+
+import java.io.Serializable;
+import java.util.Collections;
+import java.util.Map;
+
+import com.google.common.collect.Maps;
+
+import com.samskivert.depot.CacheAdapter;
+
+/**
+ * A simple cache adapter that stores all cached values in an in-memory map and never flushes.
+ * Don't use this for anything other than testing or you'll regret it.
+ */
+public class TestCacheAdapter implements CacheAdapter
+{
+    // from interface CacheAdapter
+    public synchronized <T> CacheAdapter.CacheBin<T> getCache (String id)
+    {
+        @SuppressWarnings("unchecked") CacheBin<T> bin = (CacheBin<T>)_bins.get(id);
+        if (bin == null) {
+            bin = new TestCacheBin<T>();
+            _bins.put(id, bin);
+        }
+        return bin;
+    }
+
+    // from interface CacheAdapter
+    public void shutdown ()
+    {
+        // nothing doing!
+    }
+
+    protected static class TestCachedValue<T> implements CacheAdapter.CachedValue<T>
+    {
+        public TestCachedValue (T value) {
+            _value = value;
+        }
+        public T getValue () {
+            return _value;
+        }
+        protected final T _value;
+    }
+
+    protected static class TestCacheBin<T> implements CacheAdapter.CacheBin<T>
+    {
+        public CacheAdapter.CachedValue<T> lookup (Serializable key) {
+            // System.err.println("GET " + key + ": " + _cache.containsKey(key));
+            return _cache.get(key);
+        }
+        public void store (Serializable key, T value) {
+            // System.err.println("STORE " + key);
+            _cache.put(key, new TestCachedValue<T>(value));
+        }
+        public void remove (Serializable key) {
+            // System.err.println("REMOVE " + key);
+            _cache.remove(key);
+        }
+        public Iterable<Serializable> enumerateKeys () {
+            return _cache.keySet();
+        }
+        protected Map<Serializable, CacheAdapter.CachedValue<T>> _cache =
+            Collections.synchronizedMap(
+                Maps.<Serializable, CacheAdapter.CachedValue<T>>newHashMap());
+    }
+
+    protected Map<String, CacheBin<?>> _bins = Maps.newHashMap();
+}