Source Code Cross Referenced for UpdateServiceProperties.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » services » monitor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.services.monitor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.services.monitor.UpdateServiceProperties
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.impl.services.monitor;
023:
024:        import org.apache.derby.iapi.services.monitor.PersistentService;
025:        import org.apache.derby.iapi.services.sanity.SanityManager;
026:
027:        import java.util.Properties;
028:        import java.util.Hashtable;
029:        import org.apache.derby.io.WritableStorageFactory;
030:
031:        import org.apache.derby.iapi.error.StandardException;
032:        import org.apache.derby.iapi.error.PassThroughException;
033:        import org.apache.derby.iapi.reference.Property;
034:
035:        /**
036:         */
037:        public class UpdateServiceProperties extends Properties {
038:
039:            private PersistentService serviceType;
040:            private String serviceName;
041:            private WritableStorageFactory storageFactory;
042:
043:            /*
044:            Fix for bug 3668: Following would allow user to change properties while in the session
045:            in which the database was created.
046:            While the database is being created, serviceBooted would be false. What that means
047:            is, don't save changes into services.properties file from here until the database
048:            is created. Instead, let BaseMonitor save the properties at the end of the database
049:            creation and also set serviceBooted to true at that point. From then on, the
050:            services.properties file updates will be made here.
051:             */
052:            private boolean serviceBooted;
053:
054:            public UpdateServiceProperties(PersistentService serviceType,
055:                    String serviceName, Properties actualSet,
056:                    boolean serviceBooted) {
057:                super (actualSet);
058:                this .serviceType = serviceType;
059:                this .serviceName = serviceName;
060:                this .serviceBooted = serviceBooted;
061:            }
062:
063:            //look at the comments for serviceBooted at the top to understand this.
064:            public void setServiceBooted() {
065:                serviceBooted = true;
066:            }
067:
068:            public void setStorageFactory(WritableStorageFactory storageFactory) {
069:                this .storageFactory = storageFactory;
070:            }
071:
072:            public WritableStorageFactory getStorageFactory() {
073:                return storageFactory;
074:            }
075:
076:            /*
077:             ** Methods of Hashtable (overridden)
078:             */
079:
080:            /**	
081:            	Put the key-value pair in the Properties set and
082:            	mark this set as modified.
083:
084:            	@see Hashtable#put
085:             */
086:            public Object put(Object key, Object value) {
087:                Object ref = defaults.put(key, value);
088:                if (!((String) key)
089:                        .startsWith(Property.PROPERTY_RUNTIME_PREFIX))
090:                    update();
091:                return ref;
092:            }
093:
094:            /**	
095:            	Remove the key-value pair from the Properties set and
096:            	mark this set as modified.
097:
098:            	@see Hashtable#remove
099:             */
100:            public Object remove(Object key) {
101:                Object ref = defaults.remove(key);
102:                if ((ref != null)
103:                        && (!((String) key)
104:                                .startsWith(Property.PROPERTY_RUNTIME_PREFIX)))
105:                    update();
106:                return ref;
107:            }
108:
109:            /**
110:               Saves the service properties to the disk.
111:             */
112:            public void saveServiceProperties() {
113:                if (SanityManager.DEBUG)
114:                    SanityManager
115:                            .ASSERT(
116:                                    storageFactory != null,
117:                                    "UpdateServiceProperties.saveServiceProperties() called before storageFactory set.");
118:                try {
119:                    serviceType.saveServiceProperties(serviceName,
120:                            storageFactory, BaseMonitor
121:                                    .removeRuntimeProperties(defaults), false);
122:                } catch (StandardException mse) {
123:                    throw new PassThroughException(mse);
124:                }
125:            }
126:
127:            /*
128:             ** Class specific methods.
129:             */
130:
131:            private void update() {
132:
133:                try {
134:                    //look at the comments for serviceBooted at the top to understand this if.
135:                    if (serviceBooted)
136:                        serviceType.saveServiceProperties(serviceName,
137:                                storageFactory, BaseMonitor
138:                                        .removeRuntimeProperties(defaults),
139:                                true);
140:                } catch (StandardException mse) {
141:                    throw new PassThroughException(mse);
142:                }
143:            }
144:
145:        }
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