Source Code Cross Referenced for CacheDatabaseTable.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » cache » result » schema » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.controller.cache.result.schema 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Sequoia: Database clustering technology.
003:         * Copyright (C) 2002-2004 French National Institute For Research In Computer
004:         * Science And Control (INRIA).
005:         * Copyright (C) 2005 AmicoSoft, Inc. dba Emic Networks
006:         * Contact: sequoia@continuent.org
007:         * 
008:         * Licensed under the Apache License, Version 2.0 (the "License");
009:         * you may not use this file except in compliance with the License.
010:         * 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:         * Initial developer(s): Emmanuel Cecchet.
021:         * Contributor(s): Sara Bouchenak.
022:         */package org.continuent.sequoia.controller.cache.result.schema;
023:
024:        import java.sql.SQLException;
025:        import java.util.ArrayList;
026:        import java.util.HashMap;
027:        import java.util.Iterator;
028:
029:        import org.continuent.sequoia.common.sql.schema.DatabaseColumn;
030:        import org.continuent.sequoia.common.sql.schema.DatabaseTable;
031:        import org.continuent.sequoia.controller.cache.result.entries.AbstractResultCacheEntry;
032:        import org.continuent.sequoia.controller.requests.RequestType;
033:
034:        /**
035:         * A <code>CacheDatabaseTable</code> represents a database table and its
036:         * associated cache entries. It has an array of <code>CacheDatabaseColumn</code>
037:         * objects.
038:         * <p>
039:         * Keep it mind that <code>ArrayList</code> and <code>HashMap</code> are not
040:         * synchronized...
041:         * 
042:         * @author <a href="mailto:Emmanuel.Cecchet@inria.fr">Emmanuel Cecchet </a>
043:         * @author <a href="mailto:Sara.Bouchenak@epfl.ch">Sara Bouchenak </a>
044:         * @version 1.0
045:         */
046:        public class CacheDatabaseTable {
047:            private String name;
048:            private ArrayList columns;
049:            private ArrayList cacheEntries; // Cache entries depending on this table
050:            private HashMap pkCacheEntries; // Cache entries corresponding to a pk value
051:
052:            /**
053:             * Creates a new <code>CacheDatabaseTable</code> instance.
054:             * 
055:             * @param databaseTable the database table to cache
056:             */
057:            public CacheDatabaseTable(DatabaseTable databaseTable) {
058:                // Clone the name and the columns
059:                name = databaseTable.getName();
060:                ArrayList origColumns = databaseTable.getColumns();
061:                int size = origColumns.size();
062:                columns = new ArrayList(size);
063:                for (int i = 0; i < size; i++)
064:                    columns.add(new CacheDatabaseColumn(
065:                            ((DatabaseColumn) origColumns.get(i)).getName()));
066:
067:                // Create an empty cache
068:                cacheEntries = new ArrayList();
069:                pkCacheEntries = new HashMap();
070:            }
071:
072:            /**
073:             * Gets the name of the table.
074:             * 
075:             * @return the table name
076:             */
077:            public String getName() {
078:                return name;
079:            }
080:
081:            /**
082:             * Adds a <code>CacheDatabaseColumn</code> object to this table.
083:             * <p>
084:             * Warning! The underlying <code>ArrayList</code> is not synchronized.
085:             * 
086:             * @param column a <code>CacheDatabaseColumn</code> value
087:             */
088:            public void addColumn(CacheDatabaseColumn column) {
089:                columns.add(column);
090:            }
091:
092:            /**
093:             * Merge the given table's columns with the current table. All missing columns
094:             * are added if no conflict is detected. An exception is thrown if the given
095:             * table columns conflicts with the current one.
096:             * 
097:             * @param t the table to merge
098:             * @throws SQLException if the schemas conflict
099:             */
100:            public void mergeColumns(CacheDatabaseTable t) throws SQLException {
101:                if (t == null)
102:                    return;
103:
104:                ArrayList otherColumns = t.getColumns();
105:                if (otherColumns == null)
106:                    return;
107:
108:                int size = otherColumns.size();
109:                for (int i = 0; i < size; i++) {
110:                    CacheDatabaseColumn c = (CacheDatabaseColumn) otherColumns
111:                            .get(i);
112:                    CacheDatabaseColumn original = getColumn(c.getName());
113:                    if (original == null)
114:                        addColumn(c);
115:                    else {
116:                        if (!original.equals(c))
117:                            throw new SQLException("Column " + c.getName()
118:                                    + " definition mismatch.");
119:                    }
120:                }
121:            }
122:
123:            /**
124:             * Returns a list of <code>CacheDatabaseColumn</code> objects describing the
125:             * columns of this table.
126:             * <p>
127:             * Warning! The underlying <code>ArrayList</code> is not synchronized.
128:             * 
129:             * @return an <code>ArrayList</code> of <code>CacheDatabaseColumn</code>
130:             */
131:            public ArrayList getColumns() {
132:                return columns;
133:            }
134:
135:            /**
136:             * Returns the <code>CacheDatabaseColumn</code> object matching the given
137:             * column name or <code>null</code> if not found.
138:             * 
139:             * @param columnName column name to look for
140:             * @return a <code>CacheDatabaseColumn</code> value or <code>null</code>
141:             */
142:            public CacheDatabaseColumn getColumn(String columnName) {
143:                for (Iterator i = columns.iterator(); i.hasNext();) {
144:                    CacheDatabaseColumn c = (CacheDatabaseColumn) i.next();
145:                    if (columnName.compareToIgnoreCase(c.getName()) == 0)
146:                        return c;
147:                }
148:                return null;
149:            }
150:
151:            /**
152:             * Two <code>CacheDatabaseColumn</code> are equals if they have the same
153:             * name and the same columns.
154:             * 
155:             * @param other the object to compare with
156:             * @return true if the objects are the same
157:             */
158:            public boolean equals(Object other) {
159:                if (!(other instanceof  CacheDatabaseTable))
160:                    return false;
161:
162:                CacheDatabaseTable t = (CacheDatabaseTable) other;
163:                return t.getName().equals(name)
164:                        && t.getColumns().equals(columns);
165:            }
166:
167:            /**
168:             * Adds an <code>AbstractResultCacheEntry</code> object whose consistency
169:             * depends on this table.
170:             * 
171:             * @param ce an <code>AbstractResultCacheEntry</code> value
172:             */
173:            public synchronized void addCacheEntry(AbstractResultCacheEntry ce) {
174:                cacheEntries.add(ce);
175:            }
176:
177:            /**
178:             * Adds an <code>AbstractResultCacheEntry</code> object associated to a pk
179:             * entry.
180:             * 
181:             * @param pk the pk entry
182:             * @param ce an <code>AbstractResultCacheEntry</code> value
183:             */
184:            public void addPkCacheEntry(String pk, AbstractResultCacheEntry ce) {
185:                synchronized (pkCacheEntries) {
186:                    pkCacheEntries.put(pk, ce);
187:                }
188:            }
189:
190:            /**
191:             * Gets a <code>CacheEntry</code> object associated to a pk entry.
192:             * 
193:             * @param pk the pk entry
194:             * @return the corresponding cache entry if any or null if nothing is found
195:             */
196:            public AbstractResultCacheEntry getPkResultCacheEntry(String pk) {
197:                if (pk == null)
198:                    return null;
199:                synchronized (pkCacheEntries) {
200:                    return (AbstractResultCacheEntry) pkCacheEntries.get(pk);
201:                }
202:            }
203:
204:            /**
205:             * Remove a <code>CacheEntry</code> object associated to a pk entry.
206:             * 
207:             * @param pk the pk entry
208:             */
209:            public void removePkResultCacheEntry(Object pk) {
210:                synchronized (pkCacheEntries) {
211:                    AbstractResultCacheEntry rce = (AbstractResultCacheEntry) pkCacheEntries
212:                            .remove(pk);
213:                    rce.invalidate();
214:                }
215:            }
216:
217:            /**
218:             * Invalidates all cache entries of every column of this table. This does also
219:             * affect the entries based on pk values.
220:             */
221:            public void invalidateAll() {
222:                synchronized (this ) {
223:                    for (Iterator i = cacheEntries.iterator(); i.hasNext();)
224:                        ((AbstractResultCacheEntry) i.next()).invalidate();
225:                    cacheEntries.clear();
226:
227:                    for (int i = 0; i < columns.size(); i++)
228:                        ((CacheDatabaseColumn) columns.get(i)).invalidateAll();
229:                }
230:                synchronized (pkCacheEntries) { // All pk cache entries have been invalidated as a side effect by the
231:                    // above loop.
232:                    pkCacheEntries.clear();
233:                }
234:            }
235:
236:            /**
237:             * Invalidates all cache entries of every column of this table. This does not
238:             * affect the entries based on pk values.
239:             */
240:            public synchronized void invalidateAllExceptPk() {
241:                for (Iterator i = cacheEntries.iterator(); i.hasNext();) {
242:                    AbstractResultCacheEntry qce = (AbstractResultCacheEntry) i
243:                            .next();
244:                    if (qce.getRequest().getCacheAbility() != RequestType.UNIQUE_CACHEABLE)
245:                        qce.invalidate();
246:                }
247:                cacheEntries.clear();
248:            }
249:
250:            /**
251:             * Returns information about the database table and its columns.
252:             * 
253:             * @param longFormat true for a long format, false for a short summary
254:             * @return String
255:             */
256:            public String getInformation(boolean longFormat) {
257:                String result = "Table " + name + ": ";
258:                int size = columns.size();
259:                for (int i = 0; i < size; i++) {
260:                    CacheDatabaseColumn c = (CacheDatabaseColumn) columns
261:                            .get(i);
262:                    if (longFormat)
263:                        result += "\n";
264:                    result += c.getInformation();
265:                    if (!longFormat && (i < size - 1))
266:                        result += ",";
267:                }
268:                return result;
269:            }
270:        }
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