/*
    * Copyright 2020-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.unix.aix;
   
   import java.util.function.Supplier;
   
   import com.sun.jna.platform.unix.aix.Perfstat.perfstat_memory_total_t;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.hardware.common.AbstractVirtualMemory;
  
  /**
   * Memory obtained by perfstat_memory_total_t
   */
  @ThreadSafe
  final class AixVirtualMemory extends AbstractVirtualMemory {
  
      // Memoized perfstat from GlobalMemory
      private final Supplier<perfstat_memory_total_t> perfstatMem;
  
      // AIX has multiple page size units, but for purposes of "pages" in perfstat,
      // the docs specify 4KB pages so we hardcode this
      private static final long PAGESIZE = 4096L;
  
      /**
       * Constructor for SolarisVirtualMemory.
       *
       * @param perfstatMem The memoized perfstat data from the global memory class
       */
      AixVirtualMemory(Supplier<perfstat_memory_total_t> perfstatMem) {
          this.perfstatMem = perfstatMem;
      }
  
      @Override
      public long getSwapUsed() {
          perfstat_memory_total_t perfstat = perfstatMem.get();
          return (perfstat.pgsp_total - perfstat.pgsp_free) * PAGESIZE;
      }
  
      @Override
      public long getSwapTotal() {
          return perfstatMem.get().pgsp_total * PAGESIZE;
      }
  
      @Override
      public long getVirtualMax() {
          return perfstatMem.get().virt_total * PAGESIZE;
      }
  
      @Override
      public long getVirtualInUse() {
          return perfstatMem.get().virt_active * PAGESIZE;
      }
  
      @Override
      public long getSwapPagesIn() {
          return perfstatMem.get().pgspins;
      }
  
      @Override
      public long getSwapPagesOut() {
          return perfstatMem.get().pgspouts;
      }
  }