| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.store.raw.log.FlushedScanHandle |
| 4 | |
| 5 | Copyright 1999, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.store.raw.log; |
| 22 | |
| 23 | import org.apache.derby.iapi.reference.SQLState; |
| 24 | |
| 25 | import org.apache.derby.impl.store.raw.log.LogCounter; |
| 26 | import org.apache.derby.impl.store.raw.log.LogRecord; |
| 27 | import org.apache.derby.impl.store.raw.log.StreamLogScan; |
| 28 | import org.apache.derby.iapi.services.io.ArrayInputStream; |
| 29 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 30 | import org.apache.derby.iapi.error.StandardException; |
| 31 | import org.apache.derby.iapi.store.raw.Loggable; |
| 32 | import org.apache.derby.iapi.store.raw.ScanHandle; |
| 33 | import org.apache.derby.iapi.store.raw.ScannedTransactionHandle; |
| 34 | import org.apache.derby.iapi.store.raw.log.LogFactory; |
| 35 | import org.apache.derby.iapi.store.raw.log.LogInstant; |
| 36 | import org.apache.derby.iapi.store.raw.xact.TransactionId; |
| 37 | import org.apache.derby.iapi.store.access.DatabaseInstant; |
| 38 | import java.io.IOException; |
| 39 | import java.io.InputStream; |
| 40 | import java.util.Enumeration; |
| 41 | |
| 42 | public class FlushedScanHandle implements ScanHandle |
| 43 | { |
| 44 | LogFactory lf; |
| 45 | StreamLogScan fs; |
| 46 | |
| 47 | LogRecord lr = null; |
| 48 | boolean readOptionalData = false; |
| 49 | int groupsIWant; |
| 50 | |
| 51 | ArrayInputStream rawInput = new ArrayInputStream(new byte[4096]); |
| 52 | |
| 53 | FlushedScanHandle(LogToFile lf, DatabaseInstant start, int groupsIWant) |
| 54 | throws StandardException |
| 55 | { |
| 56 | this.lf = lf; |
| 57 | fs = new FlushedScan(lf,((LogCounter)start).getValueAsLong()); |
| 58 | this.groupsIWant = groupsIWant; |
| 59 | } |
| 60 | |
| 61 | public boolean next() throws StandardException |
| 62 | { |
| 63 | readOptionalData = false; |
| 64 | lr = null; |
| 65 | |
| 66 | // filter the log stream so that only log records that belong to these |
| 67 | // interesting groups will be returned |
| 68 | |
| 69 | try |
| 70 | { |
| 71 | lr = fs.getNextRecord(rawInput,null, groupsIWant); |
| 72 | if (lr==null) return false; //End of flushed log |
| 73 | if (SanityManager.DEBUG) |
| 74 | { |
| 75 | if ((groupsIWant & lr.group()) == 0) |
| 76 | SanityManager.THROWASSERT(groupsIWant + "/" + lr.group()); |
| 77 | } |
| 78 | |
| 79 | return true; |
| 80 | } |
| 81 | catch (IOException ioe) |
| 82 | { |
| 83 | ioe.printStackTrace(); |
| 84 | fs.close(); |
| 85 | fs = null; |
| 86 | throw lf.markCorrupt( |
| 87 | StandardException.newException(SQLState.LOG_IO_ERROR, ioe)); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | Get the group for the current log record. |
| 93 | @exception StandardException Oops |
| 94 | */ |
| 95 | public int getGroup() throws StandardException |
| 96 | { |
| 97 | return lr.group(); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | Get the Loggable associated with the currentLogRecord |
| 102 | @exception StandardException Oops |
| 103 | */ |
| 104 | public Loggable getLoggable() throws StandardException |
| 105 | { |
| 106 | try { |
| 107 | return lr.getLoggable(); |
| 108 | } |
| 109 | |
| 110 | catch (IOException ioe) |
| 111 | { |
| 112 | ioe.printStackTrace(); |
| 113 | fs.close(); |
| 114 | fs = null; |
| 115 | throw lf.markCorrupt( |
| 116 | StandardException.newException(SQLState.LOG_IO_ERROR, ioe)); |
| 117 | } |
| 118 | |
| 119 | catch (ClassNotFoundException cnfe) |
| 120 | { |
| 121 | fs.close(); |
| 122 | fs = null; |
| 123 | throw lf.markCorrupt( |
| 124 | StandardException.newException(SQLState.LOG_CORRUPTED, cnfe)); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | //This may be called only once per log record. |
| 129 | public InputStream getOptionalData() |
| 130 | throws StandardException |
| 131 | { |
| 132 | if (SanityManager.DEBUG) SanityManager.ASSERT(!readOptionalData); |
| 133 | if (lr == null) return null; |
| 134 | try |
| 135 | { |
| 136 | int dataLength = rawInput.readInt(); |
| 137 | readOptionalData = true; |
| 138 | rawInput.setLimit(rawInput.getPosition(), dataLength); |
| 139 | return rawInput; |
| 140 | } |
| 141 | |
| 142 | catch (IOException ioe) |
| 143 | { |
| 144 | fs.close(); |
| 145 | fs = null; |
| 146 | throw lf.markCorrupt( |
| 147 | StandardException.newException(SQLState.LOG_IO_ERROR, ioe)); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | public DatabaseInstant getInstant() |
| 152 | throws StandardException |
| 153 | { |
| 154 | return fs.getLogInstant(); |
| 155 | } |
| 156 | |
| 157 | public Object getTransactionId() |
| 158 | throws StandardException |
| 159 | { |
| 160 | try |
| 161 | { |
| 162 | return lr.getTransactionId(); |
| 163 | } |
| 164 | catch (IOException ioe) |
| 165 | { |
| 166 | ioe.printStackTrace(); |
| 167 | fs.close(); |
| 168 | fs = null; |
| 169 | throw lf.markCorrupt( |
| 170 | StandardException.newException(SQLState.LOG_IO_ERROR, ioe)); |
| 171 | } |
| 172 | catch (ClassNotFoundException cnfe) |
| 173 | { |
| 174 | fs.close(); |
| 175 | fs = null; |
| 176 | throw lf.markCorrupt( |
| 177 | StandardException.newException(SQLState.LOG_CORRUPTED, cnfe)); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | public void close() |
| 182 | { |
| 183 | if (fs != null) fs.close(); |
| 184 | fs = null; |
| 185 | } |
| 186 | } |