Author: jbellis
Date: Thu Jan 27 04:25:28 2011
New Revision: 1063985
URL: http://svn.apache.org/viewvc?rev=1063985&view=rev
Log:
add missing CounterUpdateColumn.java
Added:
cassandra/trunk/src/java/org/apache/cassandra/db/CounterUpdateColumn.java
Added: cassandra/trunk/src/java/org/apache/cassandra/db/CounterUpdateColumn.java
URL:
http://svn.apache.org/viewvc/cassandra/trunk/src/java/org/apache/cassandra/db/CounterUpdateColumn.java?rev=1063985&view=auto
==============================================================================
--- cassandra/trunk/src/java/org/apache/cassandra/db/CounterUpdateColumn.java
(added)
+++ cassandra/trunk/src/java/org/apache/cassandra/db/CounterUpdateColumn.java
Thu Jan 27 04:25:28 2011
@@ -0,0 +1,94 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.cassandra.db;
+
+import java.nio.ByteBuffer;
+
+import org.apache.cassandra.db.context.CounterContext;
+import org.apache.cassandra.utils.ByteBufferUtil;
+
+/**
+ * A counter update while it hasn't been applied yet by the leader replica.
+ *
+ * Contains a single counter update. When applied by the leader replica, this
+ * is transformed to a relevant CounterColumn. This Column is a temporary data
+ * structure that should never be stored inside a memtable or an sstable.
+ */
+public class CounterUpdateColumn extends Column
+{
+ public CounterUpdateColumn(ByteBuffer name, long value, long timestamp)
+ {
+ this(name, ByteBufferUtil.bytes(value), timestamp);
+ }
+
+ public CounterUpdateColumn(ByteBuffer name, ByteBuffer value, long
timestamp)
+ {
+ super(name, value, timestamp);
+ }
+
+ public CounterColumn asCounterColumn()
+ {
+ return new CounterColumn(
+ ByteBufferUtil.clone(name()),
+ CounterContext.instance().create(delta()),
+ timestamp(),
+ Long.MIN_VALUE);
+ }
+
+ public long delta()
+ {
+ return value().getLong(value().position());
+ }
+
+ @Override
+ public IColumn diff(IColumn column)
+ {
+ // Diff is used during reads, but we should never read those columns
+ throw new UnsupportedOperationException("This operation is unsupported
on CounterUpdateColumn.");
+ }
+
+ @Override
+ public IColumn reconcile(IColumn column)
+ {
+ // The only time this could happen is if a batchAdd ships two
+ // increment for the same column. Hence we simply sums the delta.
+
+ assert (column instanceof CounterUpdateColumn) || (column instanceof
DeletedColumn) : "Wrong class type.";
+
+ // tombstones take precedence
+ if (column.isMarkedForDelete())
+ return timestamp() > column.timestamp() ? this : column;
+
+ // neither is tombstoned
+ CounterUpdateColumn c = (CounterUpdateColumn)column;
+ return new CounterUpdateColumn(name(), delta() + c.delta(),
Math.max(timestamp(), c.timestamp()));
+ }
+
+ @Override
+ public int serializationFlags()
+ {
+ return ColumnSerializer.COUNTER_UPDATE_MASK;
+ }
+
+ @Override
+ public IColumn deepCopy()
+ {
+ return new CounterUpdateColumn(ByteBufferUtil.clone(name),
ByteBufferUtil.clone(value), timestamp);
+ }
+}
