1 files changed, 85 insertions, 0 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/cache/SimpleCache.java b/gerrit-server/src/main/java/com/google/gerrit/server/cache/SimpleCache.java
new file mode 100644
index 0000000000..d776412892
--- /dev/null
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/cache/SimpleCache.java
@@ -0,0 +1,85 @@
+// Copyright (C) 2009 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.cache;
+
+import static java.util.concurrent.TimeUnit.SECONDS;
+
+import net.sf.ehcache.CacheException;
+import net.sf.ehcache.Ehcache;
+import net.sf.ehcache.Element;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * A fast in-memory and/or on-disk based cache.
+ *
+ * @type <K> type of key used to lookup entries in the cache.
+ * @type <V> type of value stored within each cache entry.
+ */
+final class SimpleCache<K, V> implements Cache<K, V> {
+  private static final Logger log = LoggerFactory.getLogger(SimpleCache.class);
+
+  private final Ehcache self;
+
+  SimpleCache(final Ehcache self) {
+    this.self = self;
+  }
+
+  Ehcache getEhcache() {
+    return self;
+  }
+
+  @SuppressWarnings("unchecked")
+  public V get(final K key) {
+    if (key == null) {
+      return null;
+    }
+    final Element m;
+    try {
+      m = self.get(key);
+    } catch (IllegalStateException err) {
+      log.error("Cannot lookup " + key + " in \"" + self.getName() + "\"", err);
+      return null;
+    } catch (CacheException err) {
+      log.error("Cannot lookup " + key + " in \"" + self.getName() + "\"", err);
+      return null;
+    }
+    return m != null ? (V) m.getObjectValue() : null;
+  }
+
+  public void put(final K key, final V value) {
+    self.put(new Element(key, value));
+  }
+
+  public void remove(final K key) {
+    if (key != null) {
+      self.remove(key);
+    }
+  }
+
+  @Override
+  public long getTimeToLive(final TimeUnit unit) {
+    final long maxAge = self.getCacheConfiguration().getTimeToLiveSeconds();
+    return unit.convert(maxAge, SECONDS);
+  }
+
+  @Override
+  public String toString() {
+    return "Cache[" + self.getName() + "]";
+  }
+}