org.apache.mesos.state

Class InMemoryState

java.lang.Object

org.apache.mesos.state.InMemoryState

All Implemented Interfaces:

State

public class InMemoryState
extends Object
implements State

An in-memory implementation of state.

Constructor Summary

Constructors

Constructor and Description
InMemoryState()

Method Summary

Methods

Modifier and Type	Method and Description
Future<Boolean>	expunge(Variable v) Returns true if successfully expunged the variable from the state or false if the variable did not exist or was no longer valid.
Future<Variable>	fetch(String name) Returns an immutable "variable" representing the current value from the state associated with the specified name.
Future<Iterator<String>>	names() Returns an iterator of variable names in the state.
Future<Variable>	store(Variable v) Returns an immutable "variable" representing the current value in the state if updating the specified variable in the state was successful, otherwise returns null.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

InMemoryState

public InMemoryState()

Method Detail

fetch

public Future<Variable> fetch(String name)

Description copied from interface: State

Returns an immutable "variable" representing the current value from the state associated with the specified name.

Specified by:

fetch in interface State

Parameters:

name - The name of the variable.

Returns:

A future of the variable.

See Also:

Variable

store

public Future<Variable> store(Variable v)

Description copied from interface: State

Returns an immutable "variable" representing the current value in the state if updating the specified variable in the state was successful, otherwise returns null.

Specified by:

store in interface State

Parameters:

v - The variable to be stored.

Returns:

A future of a variable with the new value on success, or null on failure.

See Also:

Variable

expunge

public Future<Boolean> expunge(Variable v)

Description copied from interface: State

Returns true if successfully expunged the variable from the state or false if the variable did not exist or was no longer valid.

Specified by:

expunge in interface State

Parameters:

v - The variable to be expunged.

Returns:

A future of true on success, false on failure.

See Also:

Variable

names

public Future<Iterator<String>> names()

Description copied from interface: State

Returns an iterator of variable names in the state.

Specified by:

names in interface State

Returns:

A future of an iterator over all variable names in the state.