1 files changed, 129 insertions, 0 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/cache/CacheProvider.java b/gerrit-server/src/main/java/com/google/gerrit/server/cache/CacheProvider.java
new file mode 100644
index 0000000000..6a7293ece0
--- /dev/null
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/cache/CacheProvider.java
@@ -0,0 +1,129 @@
+// 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 com.google.gerrit.server.cache.EvictionPolicy.LFU;
+import static java.util.concurrent.TimeUnit.DAYS;
+import static java.util.concurrent.TimeUnit.SECONDS;
+
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.ProvisionException;
+
+import net.sf.ehcache.Ehcache;
+
+import java.util.concurrent.TimeUnit;
+
+final class CacheProvider<K, V> implements Provider<Cache<K, V>>,
+    NamedCacheBinding, UnnamedCacheBinding {
+  private final boolean disk;
+  private int memoryLimit;
+  private int diskLimit;
+  private long maxAge;
+  private EvictionPolicy evictionPolicy;
+  private String cacheName;
+  private ProxyEhcache cache;
+
+  CacheProvider(final boolean disk) {
+    this.disk = disk;
+
+    memoryLimit(1024);
+    maxAge(90, DAYS);
+    evictionPolicy(LFU);
+
+    if (disk) {
+      diskLimit(16384);
+    }
+  }
+
+  @Inject
+  void setCachePool(final CachePool pool) {
+    this.cache = pool.register(this);
+  }
+
+  void bind(final Ehcache ehcache) {
+    cache.bind(ehcache);
+  }
+
+  String getName() {
+    if (cacheName == null) {
+      throw new ProvisionException("Cache has no name");
+    }
+    return cacheName;
+  }
+
+  boolean disk() {
+    return disk;
+  }
+
+  int memoryLimit() {
+    return memoryLimit;
+  }
+
+  int diskLimit() {
+    return diskLimit;
+  }
+
+  long maxAge() {
+    return maxAge;
+  }
+
+  EvictionPolicy evictionPolicy() {
+    return evictionPolicy;
+  }
+
+  public NamedCacheBinding name(final String name) {
+    if (cacheName != null) {
+      throw new IllegalStateException("Cache name already set");
+    }
+    cacheName = name;
+    return this;
+  }
+
+  public NamedCacheBinding memoryLimit(final int objects) {
+    memoryLimit = objects;
+    return this;
+  }
+
+  public NamedCacheBinding diskLimit(final int objects) {
+    if (!disk) {
+      // TODO This should really be a compile time type error, but I'm
+      // too lazy to create the mess of permutations required to setup
+      // type safe returns for bindings in our little DSL.
+      //
+      throw new IllegalStateException("Cache is not disk based");
+    }
+    diskLimit = objects;
+    return this;
+  }
+
+  public NamedCacheBinding maxAge(final long duration, final TimeUnit unit) {
+    maxAge = SECONDS.convert(duration, unit);
+    return this;
+  }
+
+  @Override
+  public NamedCacheBinding evictionPolicy(final EvictionPolicy policy) {
+    evictionPolicy = policy;
+    return this;
+  }
+
+  public Cache<K, V> get() {
+    if (cache == null) {
+      throw new ProvisionException("Cache \"" + cacheName + "\" not available");
+    }
+    return new SimpleCache<K, V>(cache);
+  }
+}