code: /*
   * Copyright 2012-2018 Chronicle Map Contributors
   *
   * Licensed 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 net.openhft.chronicle.hash.impl;
  
  import java.util.concurrent.TimeUnit;
  
  public interface SegmentHeader {
      long entries(long address);
  
      void entries(long address, long size);
  
      long deleted(long address);
  
      void deleted(long address, long deleted);
  
      long lowestPossiblyFreeChunk(long address);
  
      void lowestPossiblyFreeChunk(long address, long lowestPossiblyFreeChunk);
  
      long nextTierIndex(long address);
  
      void nextTierIndex(long address, long nextTierIndex);
  
      void readLock(long address);
  
      void readLockInterruptibly(long address) throws InterruptedException;
  
      boolean tryReadLock(long address);
  
      boolean tryReadLock(long address, long time, TimeUnit unit) throws InterruptedException;
  
      void updateLock(long address);
  
      void updateLockInterruptibly(long address) throws InterruptedException;
  
      boolean tryUpdateLock(long address);
  
      boolean tryUpdateLock(long address, long time, TimeUnit unit) throws InterruptedException;
  
      void writeLock(long address);
  
      void writeLockInterruptibly(long address) throws InterruptedException;
  
      boolean tryWriteLock(long address);
  
      boolean tryWriteLock(long address, long time, TimeUnit unit) throws InterruptedException;
  
      boolean tryUpgradeReadToUpdateLock(long address);
  
      boolean tryUpgradeReadToWriteLock(long address);
  
      void upgradeUpdateToWriteLock(long address);
  
      void upgradeUpdateToWriteLockInterruptibly(long address) throws InterruptedException;
  
      boolean tryUpgradeUpdateToWriteLock(long address);
  
      boolean tryUpgradeUpdateToWriteLock(long address, long time, TimeUnit unit)
              throws InterruptedException;
  
      void readUnlock(long address);
  
      void updateUnlock(long address);
  
      void downgradeUpdateToReadLock(long address);
  
      void writeUnlock(long address);
  
      void downgradeWriteToUpdateLock(long address);
  
      void downgradeWriteToReadLock(long address);
  
      void resetLock(long address);
  
      long resetLockState();
  
      long getLockState(long address);
  
      String lockStateToString(long lockState);
  }
  