1 files changed, 66 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/config/RequestScopedReviewDbProvider.java b/java/com/google/gerrit/server/config/RequestScopedReviewDbProvider.java
new file mode 100644
index 0000000000..fdb400bda2
--- /dev/null
+++ b/java/com/google/gerrit/server/config/RequestScopedReviewDbProvider.java
@@ -0,0 +1,66 @@
+// 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.config;
+
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.RequestCleanup;
+import com.google.gwtorm.server.OrmException;
+import com.google.gwtorm.server.SchemaFactory;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.ProvisionException;
+import com.google.inject.servlet.RequestScoped;
+
+/** Provides {@link ReviewDb} database handle live only for this request. */
+@RequestScoped
+public class RequestScopedReviewDbProvider implements Provider<ReviewDb> {
+  private final SchemaFactory<ReviewDb> schema;
+  private final Provider<RequestCleanup> cleanup;
+  private ReviewDb db;
+
+  @Inject
+  public RequestScopedReviewDbProvider(
+      final SchemaFactory<ReviewDb> schema, Provider<RequestCleanup> cleanup) {
+    this.schema = schema;
+    this.cleanup = cleanup;
+  }
+
+  @SuppressWarnings("resource")
+  @Override
+  public ReviewDb get() {
+    if (db == null) {
+      ReviewDb c;
+      try {
+        c = schema.open();
+      } catch (OrmException e) {
+        throw new ProvisionException("Cannot open ReviewDb", e);
+      }
+      try {
+        cleanup
+            .get()
+            .add(
+                () -> {
+                  c.close();
+                  db = null;
+                });
+      } catch (Throwable e) {
+        c.close();
+        throw new ProvisionException("Cannot defer cleanup of ReviewDb", e);
+      }
+      db = c;
+    }
+    return db;
+  }
+}