1 files changed, 85 insertions, 0 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/schema/SchemaVersionCheck.java b/gerrit-server/src/main/java/com/google/gerrit/server/schema/SchemaVersionCheck.java
new file mode 100644
index 0000000000..75d8a39548
--- /dev/null
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/schema/SchemaVersionCheck.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.schema;
+
+import com.google.gerrit.lifecycle.LifecycleListener;
+import com.google.gerrit.lifecycle.LifecycleModule;
+import com.google.gerrit.reviewdb.client.CurrentSchemaVersion;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gwtorm.server.OrmException;
+import com.google.gwtorm.server.SchemaFactory;
+import com.google.inject.Inject;
+import com.google.inject.Module;
+import com.google.inject.Provider;
+import com.google.inject.ProvisionException;
+
+/** Validates the current schema version. */
+public class SchemaVersionCheck implements LifecycleListener {
+  public static Module module () {
+    return new LifecycleModule() {
+      @Override
+      protected void configure() {
+        listener().to(SchemaVersionCheck.class);
+      }
+    };
+  }
+
+  private final SchemaFactory<ReviewDb> schema;
+
+  @Current
+  private final Provider<SchemaVersion> version;
+
+  @Inject
+  public SchemaVersionCheck(SchemaFactory<ReviewDb> schemaFactory,
+      @Current Provider<SchemaVersion> version) {
+    this.schema = schemaFactory;
+    this.version = version;
+  }
+
+  public void start() {
+    try {
+      final ReviewDb db = schema.open();
+      try {
+        final CurrentSchemaVersion sVer = getSchemaVersion(db);
+        final int eVer = version.get().getVersionNbr();
+
+        if (sVer == null) {
+          throw new ProvisionException("Schema not yet initialized."
+              + "  Run init to initialize the schema.");
+        }
+        if (sVer.versionNbr != eVer) {
+          throw new ProvisionException("Unsupported schema version "
+              + sVer.versionNbr + "; expected schema version " + eVer
+              + ".  Run init to upgrade.");
+        }
+      } finally {
+        db.close();
+      }
+    } catch (OrmException e) {
+      throw new ProvisionException("Cannot read schema_version", e);
+    }
+  }
+
+  public void stop() {
+  }
+
+  private CurrentSchemaVersion getSchemaVersion(final ReviewDb db) {
+    try {
+      return db.schemaVersion().get(new CurrentSchemaVersion.Key());
+    } catch (OrmException e) {
+      return null;
+    }
+  }
+}