Adding JMCR-Stable version

[Benchmarks_CSolver.git] / JMCR-Stable / real-world application / derby-10.3.2.1 / java / engine / org / apache / derby / impl / store / raw / xact / XactId.java

diff --git a/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/store/raw/xact/XactId.java b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/store/raw/xact/XactId.java
new file mode 100644 (file)
index 0000000..30e3be1
--- /dev/null
+++ b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/store/raw/xact/XactId.java
@@ -0,0 +1,176 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.impl.store.raw.xact.XactId\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.xact;\r
+\r
+import org.apache.derby.iapi.services.io.FormatIdUtil;\r
+import org.apache.derby.iapi.services.io.StoredFormatIds;\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.store.raw.xact.TransactionId;\r
+\r
+import org.apache.derby.iapi.services.io.CompressedNumber;\r
+\r
+\r
+import java.io.ObjectOutput;\r
+import java.io.ObjectInput;\r
+import java.io.IOException;\r
+\r
+/**\r
+       Use this class for a short hand representation of the transaction.  This\r
+       value is only guarentee to be unique within one continuous operation of the\r
+       raw store, in other words, every reboot may reuse the same value.\r
+\r
+       Whereas GlobalXactId is unique for all times across all raw store, a XactId\r
+       is only unique within a particular rawstore and may be reused.\r
+\r
+       XactId keeps track of the outstanding transactionId and is responsible\r
+       for dispensing new transactionIds\r
+*/\r
+public class XactId implements TransactionId\r
+{\r
+       /*\r
+       ** Fields\r
+       */\r
+       private long id;                        // immutable \r
+\r
+       /*\r
+       ** Constructor\r
+       */\r
+       public XactId(long id) {\r
+               this.id = id;\r
+       }\r
+\r
+       /*\r
+        * Formatable methods\r
+        */\r
+\r
+       // no-arg constructor, required by Formatable \r
+       public XactId() { super(); }\r
+\r
+       /**\r
+               Write this out.\r
+               @exception IOException error writing to log stream\r
+       */\r
+       public void writeExternal(ObjectOutput out) throws IOException \r
+       {\r
+               CompressedNumber.writeLong(out, id);\r
+       }\r
+\r
+       /**\r
+               Read this in\r
+               @exception IOException error reading from log stream\r
+       */\r
+       public void readExternal(ObjectInput in) throws IOException\r
+       {\r
+               id = CompressedNumber.readLong(in);\r
+       }\r
+\r
+       /**\r
+               Return my format identifier.\r
+       */\r
+       public int getTypeFormatId() {\r
+               return StoredFormatIds.RAW_STORE_XACT_ID;\r
+       }\r
+\r
+       /**\r
+               TransactionId method\r
+       */\r
+         \r
+       public int getMaxStoredSize()\r
+       {\r
+               return FormatIdUtil.getFormatIdByteLength(StoredFormatIds.RAW_STORE_XACT_ID) +\r
+                       CompressedNumber.MAX_LONG_STORED_SIZE; \r
+       }\r
+\r
+       public boolean equals(Object other) {\r
+               if (other == this)\r
+                       return true;\r
+\r
+               // assume cast will be successful rather than waste time doing an\r
+               // instanceof first.  Catch the exception if it failed.\r
+               try\r
+               {\r
+                       XactId oxid = (XactId)other;\r
+                       return (id == oxid.id);\r
+               }\r
+               catch (ClassCastException cce)\r
+               {\r
+                       return false;\r
+               }\r
+       }\r
+\r
+       public int hashCode()\r
+       {\r
+               return (int)id;\r
+       }\r
+\r
+       /**\r
+               Methods specific to this class\r
+       */\r
+\r
+       \r
+       /**\r
+               Return  0 if a == b, \r
+                               +ve number if a > b\r
+                               -ve number if a < b\r
+       */\r
+       public static long compare(TransactionId a, TransactionId b)\r
+       {\r
+               if (a == null || b == null)\r
+               {\r
+                       if (a == null)\r
+                               return -1;\r
+                       else if (b == null)\r
+                               return 1;\r
+                       else\r
+                               return 0;\r
+               }\r
+\r
+               if (SanityManager.DEBUG)\r
+               {\r
+                       SanityManager.ASSERT(a instanceof XactId);\r
+                       SanityManager.ASSERT(b instanceof XactId);\r
+               }\r
+               XactId A = (XactId)a;\r
+               XactId B = (XactId)b;\r
+\r
+               return A.id - B.id;\r
+       }\r
+\r
+       protected long getId() \r
+       {\r
+               return id;\r
+       }\r
+\r
+\r
+       public String toString()\r
+       {\r
+               // needed for virtual lock table\r
+               return Long.toString(id);\r
+       }\r
+\r
+\r
+}\r
+\r
+\r