| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.samza.storage.kv; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.samza.context.Context; |
| import org.apache.samza.table.ReadWriteTable; |
| import org.apache.samza.table.BaseTableProvider; |
| |
| /** |
| * Base class for tables backed by Samza local stores. The backing stores are |
| * injected during initialization of the table. Since the lifecycle |
| * of the underlying stores are already managed by Samza container, |
| * the table provider will not manage the lifecycle of the backing |
| * stores. |
| */ |
| public class LocalTableProvider extends BaseTableProvider { |
| |
| protected KeyValueStore kvStore; |
| |
| public LocalTableProvider(String tableId) { |
| super(tableId); |
| } |
| |
| @Override |
| public void init(Context context) { |
| super.init(context); |
| |
| Preconditions.checkNotNull(this.context, "Must specify context for local tables."); |
| |
| kvStore = this.context.getTaskContext().getStore(tableId); |
| Preconditions.checkNotNull(kvStore, String.format( |
| "Backing store for table %s was not injected by SamzaContainer", tableId)); |
| |
| logger.info("Initialized backing store for table " + tableId); |
| } |
| |
| @Override |
| public ReadWriteTable getTable() { |
| Preconditions.checkNotNull(context, String.format("Table %s not initialized", tableId)); |
| Preconditions.checkNotNull(kvStore, "Store not initialized for table " + tableId); |
| @SuppressWarnings("unchecked") |
| ReadWriteTable table = new LocalTable(tableId, kvStore); |
| table.init(this.context); |
| return table; |
| } |
| } |