| // 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.CurrentSchemaVersion; |
| import com.google.gerrit.reviewdb.ReviewDb; |
| import com.google.gerrit.reviewdb.SystemConfig; |
| import com.google.gerrit.server.schema.Current; |
| import com.google.gerrit.server.schema.SchemaVersion; |
| import com.google.gwtorm.client.OrmException; |
| import com.google.gwtorm.client.SchemaFactory; |
| import com.google.inject.Inject; |
| import com.google.inject.Provider; |
| import com.google.inject.ProvisionException; |
| |
| import java.util.List; |
| |
| /** Loads the {@link SystemConfig} from the database. */ |
| public class SystemConfigProvider implements Provider<SystemConfig> { |
| private final SchemaFactory<ReviewDb> schema; |
| |
| @Current |
| private final Provider<SchemaVersion> version; |
| |
| @Inject |
| public SystemConfigProvider(final SchemaFactory<ReviewDb> schemaFactory, |
| @Current final Provider<SchemaVersion> version) { |
| this.schema = schemaFactory; |
| this.version = version; |
| } |
| |
| @Override |
| public SystemConfig get() { |
| try { |
| final ReviewDb db = schema.open(); |
| try { |
| final CurrentSchemaVersion sVer = getSchemaVersion(db); |
| final int eVer = version.get().getVersionNbr(); |
| |
| if (sVer == null) { |
| throw new OrmException("Schema not yet initialized." |
| + " Run init to initialize the schema."); |
| } |
| if (sVer.versionNbr != eVer) { |
| throw new OrmException("Unsupported schema version " |
| + sVer.versionNbr + "; expected schema version " + eVer |
| + ". Run init to upgrade."); |
| } |
| |
| final List<SystemConfig> all = db.systemConfig().all().toList(); |
| switch (all.size()) { |
| case 1: |
| return all.get(0); |
| case 0: |
| throw new OrmException("system_config table is empty"); |
| default: |
| throw new OrmException("system_config must have exactly 1 row;" |
| + " found " + all.size() + " rows instead"); |
| } |
| } finally { |
| db.close(); |
| } |
| } catch (OrmException e) { |
| throw new ProvisionException("Cannot read system_config", e); |
| } |
| } |
| |
| private CurrentSchemaVersion getSchemaVersion(final ReviewDb db) { |
| try { |
| return db.schemaVersion().get(new CurrentSchemaVersion.Key()); |
| } catch (OrmException e) { |
| return null; |
| } |
| } |
| } |