content: /*
   * 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 static org.apache.cassandra.config.CassandraRelevantProperties.BATCH_COMMIT_LOG_SYNC_INTERVAL;
  
  class BatchCommitLogService extends AbstractCommitLogService
  {
      /**
       * Batch mode does not rely on the sync thread in {@link AbstractCommitLogService} to wake up for triggering
       * the disk sync. Instead we trigger it explicitly in {@link #maybeWaitForSync(CommitLogSegment.Allocation)}.
       * This value here is largely irrelevant, but should high enough so the sync thread is not continually waking up.
       */
      private static final int POLL_TIME_MILLIS = BATCH_COMMIT_LOG_SYNC_INTERVAL.getInt();
  
      public BatchCommitLogService(CommitLog commitLog)
      {
          super(commitLog, "COMMIT-LOG-WRITER", POLL_TIME_MILLIS);
      }
  
      protected void maybeWaitForSync(CommitLogSegment.Allocation alloc)
      {
          // wait until record has been safely persisted to disk
          pending.incrementAndGet();
          requestExtraSync();
          alloc.awaitDiskSync(commitLog.metrics.waitingOnCommit);
          pending.decrementAndGet();
      }
  }
  