com.google.appengine.api.datastore
Enum ReadPolicy.Consistency
- java.lang.Object
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- java.lang.Enum<ReadPolicy.Consistency>
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- com.google.appengine.api.datastore.ReadPolicy.Consistency
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- 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 theConsistency
for reads allows you to decide whether freshness or availability is more important.
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Enum Constant Summary
Enum Constants Enum Constant and Description EVENTUAL
Selects availability over freshness.STRONG
Selects freshness over availability.
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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.
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Enum Constant Detail
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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.
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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.
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Method Detail
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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
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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 namejava.lang.NullPointerException
- if the argument is null
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