start implementation of guava based CacheManager

scm-webapp/src/main/java/sonia/scm/cache/GuavaCacheManager.java

@@ -0,0 +1,122 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.cache;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import com.google.common.collect.Maps;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.io.IOException;
+
+import java.util.Map;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class GuavaCacheManager implements CacheManager
+{
+
+  /**
+   * the logger for GuavaCacheManager
+   */
+  private static final Logger logger =
+    LoggerFactory.getLogger(GuavaCacheManager.class);
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @throws IOException
+   */
+  @Override
+  public void close() throws IOException
+  {
+    logger.info("close guava cache manager");
+
+    for (Cache c : cacheMap.values())
+    {
+      c.clear();
+    }
+
+    cacheMap.clear();
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param key
+   * @param value
+   * @param name
+   * @param <K>
+   * @param <V>
+   *
+   * @return
+   */
+  @Override
+  public <K, V> GuavaCache<K, V> getCache(Class<K> key, Class<V> value,
+    String name)
+  {
+    logger.trace("try to retrieve cache {}", name);
+
+    GuavaCache<K, V> cache = cacheMap.get(name);
+
+    if (cache == null)
+    {
+      logger.debug(
+        "cache {} does not exists, creating a new instance from default configuration: {}",
+        name, defaultConfiguration);
+      cache = new GuavaCache<K, V>(defaultConfiguration);
+      cacheMap.put(name, cache);
+    }
+
+    return cache;
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private Map<String, GuavaCache> cacheMap = Maps.newConcurrentMap();
+
+  /** Field description */
+  private CacheConfiguration defaultConfiguration;
+}