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1   /*
2    * Copyright (c) 2011.  The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.hbql.statement;
22  
23  import org.apache.hadoop.hbase.hbql.client.AsyncExecutorManager;
24  import org.apache.hadoop.hbase.hbql.client.ExecutionResults;
25  import org.apache.hadoop.hbase.hbql.client.HBqlException;
26  import org.apache.hadoop.hbase.hbql.executor.AsyncExecutorDefinition;
27  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
28  
29  public class CreateAsyncExecutorStatement extends GenericStatement implements ConnectionStatement {
30  
31      private final AsyncExecutorDefinition args;
32  
33      public CreateAsyncExecutorStatement(final StatementPredicate predicate,
34                                          final AsyncExecutorDefinition args) {
35          super(predicate);
36          this.args = args;
37      }
38  
39      private AsyncExecutorDefinition getArgs() {
40          return this.args;
41      }
42  
43      protected ExecutionResults execute(final HConnectionImpl conn) throws HBqlException {
44  
45          this.getArgs().validatePropertyList();
46  
47          AsyncExecutorManager.newAsyncExecutor(this.getArgs().getName(),
48                                                this.getArgs().getMinThreadCount(),
49                                                this.getArgs().getMaxThreadCount(),
50                                                this.getArgs().getKeepAliveSecs());
51  
52          return new ExecutionResults("Async executor " + this.getArgs().getName() + " created.");
53      }
54  
55  
56      public static String usage() {
57          return "CREATE ASYNC EXECUTOR name (MIN_THREAD_COUNT: int_expr, MAX_THREAD_COUNT: int_expr, THREADS_READ_RESULTS: bool_expr, COMPLETION_QUEUE_SIZE: int_expr) [IF bool_expr]";
58      }
59  }