com.google.appengine.api.datastore
Enum ReadPolicy.Consistency

java.lang.Object
  java.lang.Enum<ReadPolicy.Consistency>
      com.google.appengine.api.datastore.ReadPolicy.Consistency

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

EVENTUAL
Selects availability over freshness.

STRONG
Selects freshness over availability.

Method Summary

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