1 package org.apache.directmemory.conf;
2
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,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.slf4j.Logger;
23 import org.slf4j.LoggerFactory;
24
25
26 /**
27 * Provides a global single point of access to all singleton properties comprehensible to DirectMemory.
28 * @since 0.2
29 */
30 public final class Configuration
31 {
32 private static final Logger logger = LoggerFactory.getLogger( Configuration.class );
33
34 public static int getNumberOfBuffers()
35 {
36 return configurationService.getNumberOfBuffers();
37 }
38
39 public static int getInitialCapacity()
40 {
41 return configurationService.getInitialCapacity();
42 }
43
44 public static int getRamMegaBytes()
45 {
46 return configurationService.getRamMegaBytes();
47 }
48
49 public static long getDisposalTime()
50 {
51 return configurationService.getDisposalTime();
52 }
53
54 public static int getConcurrencyLevel()
55 {
56 return configurationService.getConcurrencyLevel();
57 }
58
59 private static ConfigurationService configurationService;
60
61 static
62 {
63 if ( configurationService == null )
64 {
65 // if not otherwise specified with another mechanism it uses the default implementation
66 logger.info( "using default configuration implementation" );
67 configurationService = new SimplePropertiesConfiguration();
68 }
69 }
70
71 // Prevent instance escape
72 private Configuration()
73 {
74 }
75
76 public static void configureFromYaml()
77 {
78 logger.info( "using yaml configuration implementation" );
79 configurationService = YamlConfiguration.load();
80 }
81
82 }