java/src/main/com/google/appengine/api/quota/QuotaServiceImpl.java

   1 // Copyright 2009 Google Inc. All Rights Reserved.
   2
   3 package com.google.appengine.api.quota;
   4
   5 import com.google.apphosting.api.ApiProxy;
   6 import com.google.apphosting.api.ApiStats;
   7 import com.google.apphosting.api.ApiProxy.Environment;
   8
   9 /**
  10  * Implementation details for the QuotaService.
  11  *
  12  *
  13  */
  14 class QuotaServiceImpl implements QuotaService {
  15
  16   private static final double MCYCLES_PER_SECOND = 1200.0;
  17
  18   private static ApiStats getStats() {
  19     Environment env = ApiProxy.getCurrentEnvironment();
  20     if (env == null) {
  21       return null;
  22     }
  23     return ApiStats.get(env);
  24   }
  25
  26   public boolean supports(DataType type) {
  27
  28     return getStats() != null;
  29   }
  30
  31   public long getApiTimeInMegaCycles() {
  32     ApiStats stats = getStats();
  33     return (stats == null) ? 0L : stats.getApiTimeInMegaCycles();
  34   }
  35
  36   public long getCpuTimeInMegaCycles() {
  37     ApiStats stats = getStats();
  38     return (stats == null) ? 0L : stats.getCpuTimeInMegaCycles();
  39   }
  40
  41   @Override
  42   public long convertCpuSecondsToMegacycles(double cpuSeconds) {
  43     return (long) (cpuSeconds * MCYCLES_PER_SECOND);
  44   }
  45
  46   @Override
  47   public double convertMegacyclesToCpuSeconds(long megaCycles) {
  48     return megaCycles / MCYCLES_PER_SECOND;
  49   }
  50
  51 }