db: Import db/commmitlog/*

Signed-off-by: Calle Wilund <calle@cloudius-systems.com>

db/commitlog/BatchCommitLogService.java

@@ -0,0 +1,36 @@
+/*
+ * 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.commitlog;
+
+import org.apache.cassandra.config.DatabaseDescriptor;
+
+class BatchCommitLogService extends AbstractCommitLogService
+{
+    public BatchCommitLogService(CommitLog commitLog)
+    {
+        super(commitLog, "COMMIT-LOG-WRITER", (int) DatabaseDescriptor.getCommitLogSyncBatchWindow());
+    }
+
+    protected void maybeWaitForSync(CommitLogSegment.Allocation alloc)
+    {
+        // wait until record has been safely persisted to disk
+        pending.incrementAndGet();
+        alloc.awaitDiskSync();
+        pending.decrementAndGet();
+    }
+}