ReadPolicy.Consistency (Google App Engine API for Java)

com.google.appengine.api.datastore

Enum ReadPolicy.Consistency

  • java.lang.Object
  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<ReadPolicy.Consistency>
    Enclosing class:
    ReadPolicy


    public static enum ReadPolicy.Consistency
    extends java.lang.Enum<ReadPolicy.Consistency>
    Setting the Consistency for reads allows you to decide whether freshness or availability is more important.
    • Enum Constant Summary

      Enum Constants 
      Enum Constant and Description
      EVENTUAL
      Selects availability over freshness.
      STRONG
      Selects freshness over availability.
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method and Description
      static ReadPolicy.Consistency valueOf(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static ReadPolicy.Consistency[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
    • Enum Constant Detail

      • STRONG

        public static final ReadPolicy.Consistency STRONG
        Selects freshness over availability. Strongly consistent reads are guaranteed to return the most up-to-date data but will timeout more often than eventually consistent reads.
      • EVENTUAL

        public static final ReadPolicy.Consistency EVENTUAL
        Selects availability over freshness. Eventually consistent reads will timeout less often than Strong reads but will occasionally return stale results.
    • Method Detail

      • values

        public static ReadPolicy.Consistency[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (ReadPolicy.Consistency c : ReadPolicy.Consistency.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static ReadPolicy.Consistency valueOf(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null

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