com.bluegosling.graph

Interface NodeDecorator

public interface NodeDecorator

An object used to decorate a node operation. This can be used to add cross-cutting concerns to all nodes in a graph, like for logging, metrics, etc. The decorator is invoked in the same thread that calls Computation.compute(), so it can be used to propagate thread-local state from the caller to worker threads that execute the node operations.

Method Summary

Modifier and Type	Method and Description
<T> Callable<FluentFuture<T>>	decorate(Graph<?> graph, Node<T> node, Callable<FluentFuture<T>> operation) Decorates the given callable, which is the operation (possibly already decorated) for the given graph and node.

Method Detail

decorate

<T> Callable<FluentFuture<T>> decorate(Graph<?> graph,
                                       Node<T> node,
                                       Callable<FluentFuture<T>> operation)

Decorates the given callable, which is the operation (possibly already decorated) for the given graph and node. The returned callable is a wrapper that can perform additional logic before passing control to the given operation.

Parameters:

graph - the graph being computed

node - the node to decorate

operation - the operation for the given node, possibly already wrapped by another decorator

Returns:

a new callable that decorates the given one