Source Code Cross Referenced for BackingStoreHashTableFromScan.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » store » access » 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.store.access 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.store.access.BackingStoreHashTableFromScan
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.store.access;
023:
024:        import org.apache.derby.iapi.services.sanity.SanityManager;
025:
026:        import org.apache.derby.iapi.error.StandardException;
027:
028:        import org.apache.derby.iapi.store.access.conglomerate.ScanManager;
029:
030:        import org.apache.derby.iapi.store.access.Qualifier;
031:        import org.apache.derby.iapi.store.access.RowSource;
032:        import org.apache.derby.iapi.store.access.TransactionController;
033:
034:        import org.apache.derby.iapi.types.DataValueDescriptor;
035:
036:        import org.apache.derby.iapi.store.access.BackingStoreHashtable;
037:        import org.apache.derby.iapi.services.io.FormatableBitSet;
038:
039:        import java.util.Properties;
040:
041:        /**
042:
043:         Extend BackingStoreHashtable with the ability to maintain the underlying 
044:         openScan() until the hashtable has been closed.  This is necessary for 
045:         long row access.  Access to long row delays actual objectification until
046:         the columns are accessed, but depends on the underlying table to be still
047:         open when the column is accessed.  
048:
049:         <P>
050:         Transactions are obtained from an AccessFactory.
051:         @see BackingStoreHashtable
052:
053:         **/
054:
055:        class BackingStoreHashTableFromScan extends BackingStoreHashtable {
056:
057:            /**************************************************************************
058:             * Fields of the class
059:             **************************************************************************
060:             */
061:            private ScanManager open_scan;
062:
063:            /**************************************************************************
064:             * Constructors for This class:
065:             **************************************************************************
066:             */
067:            public BackingStoreHashTableFromScan(TransactionController tc,
068:                    long conglomId, int open_mode, int lock_level,
069:                    int isolation_level, FormatableBitSet scanColumnList,
070:                    DataValueDescriptor[] startKeyValue,
071:                    int startSearchOperator, Qualifier qualifier[][],
072:                    DataValueDescriptor[] stopKeyValue, int stopSearchOperator,
073:                    long max_rowcnt, int[] key_column_numbers,
074:                    boolean remove_duplicates, long estimated_rowcnt,
075:                    long max_inmemory_rowcnt, int initialCapacity,
076:                    float loadFactor, boolean collect_runtimestats,
077:                    boolean skipNullKeyColumns) throws StandardException {
078:
079:                super (tc, (RowSource) null, key_column_numbers,
080:                        remove_duplicates, estimated_rowcnt,
081:                        max_inmemory_rowcnt, initialCapacity, loadFactor,
082:                        skipNullKeyColumns, false /* Do not keep the hash table after a commit. */);
083:
084:                open_scan = (ScanManager) tc.openScan(conglomId, false,
085:                        open_mode, lock_level, isolation_level, scanColumnList,
086:                        startKeyValue, startSearchOperator, qualifier,
087:                        stopKeyValue, stopSearchOperator);
088:
089:                open_scan.fetchSet(max_rowcnt, key_column_numbers, this );
090:
091:                if (collect_runtimestats) {
092:                    Properties prop = new Properties();
093:                    open_scan.getScanInfo().getAllScanInfo(prop);
094:                    this .setAuxillaryRuntimeStats(prop);
095:                    prop = null;
096:                }
097:            }
098:
099:            /**************************************************************************
100:             * Private/Protected methods of This class:
101:             **************************************************************************
102:             */
103:
104:            /**************************************************************************
105:             * Public Methods of This class:
106:             **************************************************************************
107:             */
108:
109:            /**
110:             * Close the BackingStoreHashtable.
111:             * <p>
112:             * Perform any necessary cleanup after finishing with the hashtable.  Will
113:             * deallocate/dereference objects as necessary.  If the table has gone
114:             * to disk this will drop any on disk files used to support the hash table.
115:             * <p>
116:             *
117:             * @exception  StandardException  Standard exception policy.
118:             **/
119:            public void close() throws StandardException {
120:                open_scan.close();
121:
122:                super .close();
123:
124:                return;
125:            }
126:
127:            /**************************************************************************
128:             * Public Methods of XXXX class:
129:             **************************************************************************
130:             */
131:        }
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