--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.store.raw.data.SetReservedSpaceOperation\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to you under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.store.raw.data;\r
+\r
+import org.apache.derby.iapi.reference.SQLState;\r
+\r
+import org.apache.derby.impl.store.raw.data.BasePage;\r
+\r
+import org.apache.derby.iapi.services.io.FormatIdUtil;\r
+import org.apache.derby.iapi.services.io.StoredFormatIds;\r
+\r
+import org.apache.derby.iapi.store.raw.Page;\r
+import org.apache.derby.iapi.store.raw.Transaction;\r
+\r
+import org.apache.derby.iapi.store.raw.log.LogInstant;\r
+import org.apache.derby.iapi.store.raw.xact.RawTransaction; \r
+\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.services.io.CompressedNumber;\r
+import org.apache.derby.iapi.util.ByteArray;\r
+import org.apache.derby.iapi.services.io.DynamicByteArrayOutputStream;\r
+import org.apache.derby.iapi.services.io.DynamicByteArrayOutputStream;\r
+\r
+import java.io.OutputStream;\r
+import java.io.ObjectOutput;\r
+import java.io.ObjectInput;\r
+import java.io.IOException;\r
+import org.apache.derby.iapi.services.io.LimitObjectInput;\r
+\r
+/**\r
+ Represents shrinking of the reserved space of a particular row on a page.\r
+ This operation is not undoable.\r
+*/\r
+public class SetReservedSpaceOperation extends PageBasicOperation {\r
+\r
+ protected int doMeSlot; // slot where record is at\r
+ protected int recordId; // recordId\r
+ protected int newValue; // the new reserved space value\r
+ protected int oldValue; // the old reserved space value (for BI_logging)\r
+\r
+ public SetReservedSpaceOperation(BasePage page, int slot, \r
+ int recordId, int newValue, int oldValue)\r
+ {\r
+ super(page);\r
+ doMeSlot = slot;\r
+ this.recordId = recordId;\r
+ this.newValue = newValue;\r
+ this.oldValue = oldValue;\r
+\r
+ if (SanityManager.DEBUG) // we only use this for shrinking\r
+ SanityManager.ASSERT(oldValue > newValue);\r
+ }\r
+\r
+ /*\r
+ * Formatable methods\r
+ */\r
+ // no-arg constructor, required by Formatable \r
+ public SetReservedSpaceOperation() { super(); }\r
+\r
+ /**\r
+ Return my format identifier.\r
+ */\r
+ public int getTypeFormatId() {\r
+ return StoredFormatIds.LOGOP_SET_RESERVED_SPACE;\r
+ }\r
+\r
+ public void writeExternal(ObjectOutput out) throws IOException \r
+ {\r
+ super.writeExternal(out);\r
+\r
+ CompressedNumber.writeInt(out, doMeSlot);\r
+ CompressedNumber.writeInt(out, recordId);\r
+ CompressedNumber.writeInt(out, newValue);\r
+ CompressedNumber.writeInt(out, oldValue);\r
+ }\r
+\r
+ /**\r
+ Read this in\r
+ @exception IOException error reading from log stream\r
+ @exception ClassNotFoundException log stream corrupted\r
+ */\r
+ public void readExternal(ObjectInput in) \r
+ throws IOException, ClassNotFoundException\r
+ {\r
+ super.readExternal(in);\r
+ doMeSlot = CompressedNumber.readInt(in);\r
+ recordId = CompressedNumber.readInt(in);\r
+ newValue = CompressedNumber.readInt(in);\r
+ oldValue = CompressedNumber.readInt(in);\r
+ }\r
+\r
+ /*\r
+ * Loggable methods\r
+ */\r
+ /**\r
+ @exception IOException Can be thrown by any of the methods of ObjectInput.\r
+ @exception StandardException Standard Derby policy. \r
+ \r
+ @see org.apache.derby.iapi.store.raw.Loggable#doMe\r
+ */\r
+ public void doMe(Transaction xact, LogInstant instant, LimitObjectInput in)\r
+ throws StandardException, IOException \r
+ {\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ SanityManager.ASSERT(oldValue ==\r
+ this.page.getReservedCount(doMeSlot));\r
+ SanityManager.ASSERT(newValue < oldValue,\r
+ "cannot set reserved space to be bigger than before"); \r
+ }\r
+\r
+ page.setReservedSpace(instant, doMeSlot, newValue);\r
+ }\r
+\r
+ /*\r
+ * method to support BeforeImageLogging - This log operation is not\r
+ * undoable in the logical sense , but all log operations that touch a page\r
+ * must support physical undo during RRR transaction.\r
+ */\r
+\r
+ /**\r
+ * restore the before image of the page\r
+ *\r
+ * @exception StandardException Standard Derby Error Policy\r
+ * @exception IOException problem reading the complete log record from the\r
+ * input stream\r
+ */\r
+\r
+ public void restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)\r
+ throws StandardException, IOException\r
+ {\r
+ int slot = undoPage.findRecordById(recordId,Page.FIRST_SLOT_NUMBER);\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ if ( ! getPageId().equals(undoPage.getPageId()))\r
+ SanityManager.THROWASSERT(\r
+ "restoreMe cannot restore to a different page. "\r
+ + "doMe page:" + getPageId() + " undoPage:" + \r
+ undoPage.getPageId());\r
+ if (slot != doMeSlot)\r
+ SanityManager.THROWASSERT(\r
+ "restoreMe cannot restore to a different slot. "\r
+ + "doMe slot:" + doMeSlot + " undoMe slot: " +\r
+ slot + " recordId:" + recordId);\r
+\r
+ }\r
+\r
+ page.setReservedSpace(CLRinstant, slot, oldValue);\r
+\r
+ }\r
+\r
+ /**\r
+ DEBUG: Print self.\r
+ */\r
+ public String toString()\r
+ {\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ return super.toString() +\r
+ "Set Reserved space of recordId " + recordId + " from " + oldValue + " to " + newValue;\r
+ }\r
+ return null;\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff