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.bookkeeper.bookie.storage.directentrylogger;
  
  import static com.google.common.base.Preconditions.checkState;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufAllocator;
  import java.io.IOException;
  import org.apache.bookkeeper.bookie.EntryLogMetadata;
  
  /**
   * WriterWithMetadata.
   */
  class WriterWithMetadata {
      private final LogWriter writer;
      private final EntryLogMetadata metadata;
      private final ByteBufAllocator allocator;
  
      WriterWithMetadata(LogWriter writer, EntryLogMetadata metadata,
                         ByteBufAllocator allocator) throws IOException {
          this.writer = writer;
          this.metadata = metadata;
          this.allocator = allocator;
  
          ByteBuf buf = allocator.buffer(Buffer.ALIGNMENT);
          try {
              Header.writeEmptyHeader(buf);
              writer.writeAt(0, buf);
              writer.position(buf.capacity());
          } finally {
              buf.release();
          }
      }
  
      int logId() {
          return writer.logId();
      }
  
      boolean shouldRoll(ByteBuf entry, long rollThreshold) throws IOException {
          return (writer.position() + writer.serializedSize(entry)) > rollThreshold;
      }
  
      long addEntry(long ledgerId, ByteBuf entry) throws IOException {
          int size = entry.readableBytes();
          metadata.addLedgerSize(ledgerId, size + Integer.BYTES);
          long offset = writer.writeDelimited(entry);
          checkState(offset < Integer.MAX_VALUE, "Offsets can't be higher than max int (%d)", offset);
          return ((long) writer.logId()) << 32 | offset;
      }
  
      void flush() throws IOException {
          writer.flush();
      }
  
      void finalizeAndClose() throws IOException {
          writer.flush();
          LogMetadata.write(writer, metadata, allocator);
          writer.close();
      }
  }
  