--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.store.raw.data.EncryptContainerUndoOperation\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.services.sanity.SanityManager;\r
+import org.apache.derby.iapi.services.io.StoredFormatIds;\r
+\r
+import org.apache.derby.iapi.store.raw.Compensation;\r
+import org.apache.derby.iapi.store.raw.Loggable;\r
+import org.apache.derby.iapi.store.raw.Transaction;\r
+import org.apache.derby.iapi.store.raw.Undoable;\r
+import org.apache.derby.iapi.util.ByteArray;\r
+import org.apache.derby.iapi.store.raw.log.LogInstant;\r
+import org.apache.derby.iapi.error.StandardException;\r
+\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
+/** A Encrypt Container undo operation rolls back the change of a \r
+ * Encrypt Container operation \r
+ */\r
+public class EncryptContainerUndoOperation implements Compensation \r
+{\r
+ // the operation to rollback \r
+ transient private EncryptContainerOperation undoOp;\r
+\r
+ /** During redo, the whole operation will be reconstituted from the log */\r
+\r
+ /** \r
+ * Set up a Encrypt Container undo operation during run time rollback\r
+ * @param op Encrypt contaner operatation that is to be undone. \r
+ */\r
+ public EncryptContainerUndoOperation(EncryptContainerOperation op) \r
+ {\r
+ undoOp = op;\r
+ }\r
+\r
+ /*\r
+ * Formatable methods\r
+ */\r
+\r
+ // no-arg constructor, required by Formatable \r
+ public EncryptContainerUndoOperation() { super(); }\r
+\r
+ public void writeExternal(ObjectOutput out) throws IOException \r
+ {\r
+ // nothing to write.\r
+ }\r
+\r
+ /**\r
+ @exception IOException cannot read log record from log stream\r
+ @exception ClassNotFoundException cannot read ByteArray object\r
+ */\r
+ public void readExternal(ObjectInput in) \r
+ throws IOException, ClassNotFoundException\r
+ {\r
+ // nothing to read.\r
+ }\r
+\r
+ /**\r
+ Return my format identifier.\r
+ */\r
+ public int getTypeFormatId() {\r
+ return StoredFormatIds.LOGOP_ENCRYPT_CONTAINER_UNDO;\r
+ }\r
+\r
+ /** \r
+ Compensation method\r
+ */\r
+\r
+ /** Set up a Container undo operation during recovery redo. */\r
+ public void setUndoOp(Undoable op)\r
+ {\r
+ if (SanityManager.DEBUG) {\r
+ SanityManager.ASSERT(op instanceof EncryptContainerOperation);\r
+ }\r
+\r
+ undoOp = (EncryptContainerOperation)op;\r
+ }\r
+\r
+ /**\r
+ Loggable methods\r
+ */\r
+\r
+ \r
+ /**\r
+ * Check if this operation needs to be redone during recovery redo. \r
+ * Returns true if this op should be redone during recovery redo,\r
+ * @param xact the transaction that is doing the rollback\r
+ * @return true, if this operation needs to be redone during recovery.\r
+ * @exception StandardException Standard Derby error policy\r
+ */\r
+ public boolean needsRedo(Transaction xact)\r
+ throws StandardException\r
+ {\r
+ return true;\r
+ }\r
+\r
+ /**\r
+ the default for prepared log is always null for all the operations\r
+ that don't have optionalData. If an operation has optional data,\r
+ the operation need to prepare the optional data for this method.\r
+\r
+ Encrypt Conatainer Undo Operation has no optional data to write out\r
+ */\r
+ public ByteArray getPreparedLog()\r
+ {\r
+ return (ByteArray) null;\r
+ }\r
+\r
+\r
+ /** Apply the undo operation, in this implementation of the\r
+ RawStore, it can only call the undoMe method of undoOp\r
+ @param xact the Transaction that is doing the rollback\r
+ @param instant the log instant of this compenstaion operation\r
+ @param in optional data\r
+ @exception IOException Can be thrown by any of the methods of ObjectInput.\r
+ @exception StandardException Standard Derby policy.\r
+\r
+ @see EncryptContainerOperation#generateUndo\r
+ */\r
+ public final void doMe(Transaction xact, LogInstant instant, \r
+ LimitObjectInput in) \r
+ throws StandardException, IOException\r
+ {\r
+ undoOp.undoMe(xact);\r
+ releaseResource(xact);\r
+ }\r
+\r
+ /* make sure resource found in undoOp is released */\r
+ public void releaseResource(Transaction xact)\r
+ {\r
+ if (undoOp != null)\r
+ undoOp.releaseResource(xact);\r
+ }\r
+\r
+ /* Undo operation is a COMPENSATION log operation */\r
+ public int group()\r
+ {\r
+ return Loggable.COMPENSATION | Loggable.RAWSTORE;\r
+ }\r
+\r
+ /**\r
+ DEBUG: Print self.\r
+ */\r
+ public String toString()\r
+ {\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ String str = "CLR (Encrypt Container Undo): " ;\r
+ if (undoOp != null)\r
+ str += undoOp.toString();\r
+ else\r
+ str += "undo Operation not set";\r
+\r
+ return str;\r
+ }\r
+ else\r
+ return null;\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff