DefaultHighRepJobPolicy

com.google.appengine.api.datastore.dev

Class DefaultHighRepJobPolicy

  • java.lang.Object
    • com.google.appengine.api.datastore.dev.DefaultHighRepJobPolicy
  • All Implemented Interfaces:
    HighRepJobPolicy


    public class DefaultHighRepJobPolicy
    extends java.lang.Object
    implements HighRepJobPolicy
    An implementation of HighRepJobPolicy in which a user-defined percentage of jobs do not apply. The percentage applies to both new (initial write) and existing (roll forward) jobs. The user can also provide a random seed, which can be used to make the behavior of this class deterministic in tests.
    • Field Summary

      Fields 
      Modifier and Type Field and Description
      static java.lang.String RANDOM_SEED_PROPERTY
      A long that will be used as the seed for the Random that determines whether or not a job application attempt fails.
      static java.lang.String UNAPPLIED_JOB_PERCENTAGE_PROPERTY
      A float >= 0 and <= 100 representing the percentage of job application attempts that will fail.
    • Constructor Summary

      Constructors 
      Constructor and Description
      DefaultHighRepJobPolicy(long unappliedJobSeed, float unappliedJobPercentage)
      Constructs a DefaultHighRepJobPolicy.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      boolean shouldApplyNewJob(com.google.appengine.api.datastore.Key entityGroup) 
      boolean shouldRollForwardExistingJob(com.google.appengine.api.datastore.Key entityGroup) 
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • RANDOM_SEED_PROPERTY

        public static final java.lang.String RANDOM_SEED_PROPERTY
        A long that will be used as the seed for the Random that determines whether or not a job application attempt fails. Must be parsable via Long.parseLong(String). If not provided we use the current time (in millis) as the seed.
        See Also:
        Constant Field Values
      • UNAPPLIED_JOB_PERCENTAGE_PROPERTY

        public static final java.lang.String UNAPPLIED_JOB_PERCENTAGE_PROPERTY
        A float >= 0 and <= 100 representing the percentage of job application attempts that will fail. Must be parsable via Float.parseFloat(String). Any portion of the value beyond two decimal places will be truncated. If not provided we set the percentage to 0, which yields the master/slave consistency model.
        See Also:
        Constant Field Values
    • Constructor Detail

      • DefaultHighRepJobPolicy

        public DefaultHighRepJobPolicy(long unappliedJobSeed,
                                       float unappliedJobPercentage)
        Constructs a DefaultHighRepJobPolicy.
        Parameters:
        unappliedJobSeed - The seed to use for random number generation.
        unappliedJobPercentage - The percentage of jobs that should fail to apply. This percentage applies to both new jobs and attempts to roll forward existing unapplied jobs.
    • Method Detail

      • shouldApplyNewJob

        public boolean shouldApplyNewJob(com.google.appengine.api.datastore.Key entityGroup)
        Specified by:
        shouldApplyNewJob in interface HighRepJobPolicy
        Parameters:
        entityGroup - A unique identifier for the entity group.
        Returns:
        true if the new job should apply according to the policy, false otherwise.
      • shouldRollForwardExistingJob

        public boolean shouldRollForwardExistingJob(com.google.appengine.api.datastore.Key entityGroup)
        Specified by:
        shouldRollForwardExistingJob in interface HighRepJobPolicy
        Parameters:
        entityGroup - A unique identifier for the entity group.
        Returns:
        true if the existing job should roll forward according to the policy, false otherwise.

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App Engine standard environment for Java