org.apache.tinkerpop.gremlin.process.computer.VertexProgram.loadState java code examples

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/**
 * A helper method to construct a {@link VertexProgram} given the content of the supplied configuration.
 * The class of the VertexProgram is read from the {@link VertexProgram#VERTEX_PROGRAM} static configuration key.
 * Once the VertexProgram is constructed, {@link VertexProgram#loadState} method is called with the provided graph and configuration.
 *
 * @param graph         The graph that the vertex program will execute against
 * @param configuration A configuration with requisite information to build a vertex program
 * @param <V>           The vertex program type
 * @return the newly constructed vertex program
 */
public static <V extends VertexProgram> V createVertexProgram(final Graph graph, final Configuration configuration) {
  try {
    final Class<V> vertexProgramClass = (Class) Class.forName(configuration.getString(VERTEX_PROGRAM));
    final Constructor<V> constructor = vertexProgramClass.getDeclaredConstructor();
    constructor.setAccessible(true);
    final V vertexProgram = constructor.newInstance();
    vertexProgram.loadState(graph, configuration);
    return vertexProgram;
  } catch (final Exception e) {
    throw new IllegalStateException(e.getMessage(), e);
  }
}

@Override
public void loadState(final Graph graph, final Configuration configuration) {
  VertexProgram.super.loadState(graph, configuration);
  this.traversal = PureTraversal.loadState(configuration, VertexProgramStep.ROOT_TRAVERSAL, graph);
  this.haltedTraversers = TraversalVertexProgram.loadHaltedTraversers(configuration);
  this.programStep = new TraversalMatrix<>(this.traversal.get()).getStepById(configuration.getString(ProgramVertexProgramStep.STEP_ID));
  this.memoryComputeKeys.addAll(MemoryTraversalSideEffects.getMemoryComputeKeys(this.traversal.get()));
  this.memoryComputeKeys.add(MemoryComputeKey.of(TraversalVertexProgram.HALTED_TRAVERSERS, Operator.addAll, false, false));
  this.memoryComputeKeys.add(MemoryComputeKey.of(TraversalVertexProgram.ACTIVE_TRAVERSERS, Operator.addAll, true, true));
}

/**
 * A helper method to construct a {@link VertexProgram} given the content of the supplied configuration.
 * The class of the VertexProgram is read from the {@link VertexProgram#VERTEX_PROGRAM} static configuration key.
 * Once the VertexProgram is constructed, {@link VertexProgram#loadState} method is called with the provided graph and configuration.
 *
 * @param graph         The graph that the vertex program will execute against
 * @param configuration A configuration with requisite information to build a vertex program
 * @param <V>           The vertex program type
 * @return the newly constructed vertex program
 */
public static <V extends VertexProgram> V createVertexProgram(final Graph graph, final Configuration configuration) {
  try {
    final Class<V> vertexProgramClass = (Class) Class.forName(configuration.getString(VERTEX_PROGRAM));
    final Constructor<V> constructor = vertexProgramClass.getDeclaredConstructor();
    constructor.setAccessible(true);
    final V vertexProgram = constructor.newInstance();
    vertexProgram.loadState(graph, configuration);
    return vertexProgram;
  } catch (final Exception e) {
    throw new IllegalStateException(e.getMessage(), e);
  }
}

@Override
public void loadState(final Graph graph, final Configuration configuration) {
  VertexProgram.super.loadState(graph, configuration);
  this.traversal = PureTraversal.loadState(configuration, VertexProgramStep.ROOT_TRAVERSAL, graph);
  this.haltedTraversers = TraversalVertexProgram.loadHaltedTraversers(configuration);
  this.programStep = new TraversalMatrix<>(this.traversal.get()).getStepById(configuration.getString(ProgramVertexProgramStep.STEP_ID));
  this.memoryComputeKeys.addAll(MemoryTraversalSideEffects.getMemoryComputeKeys(this.traversal.get()));
  this.memoryComputeKeys.add(MemoryComputeKey.of(TraversalVertexProgram.HALTED_TRAVERSERS, Operator.addAll, false, false));
  this.memoryComputeKeys.add(MemoryComputeKey.of(TraversalVertexProgram.ACTIVE_TRAVERSERS, Operator.addAll, true, true));
}

Javadoc

When it is necessary to load the state of the VertexProgram, this method is called. This is typically required when the VertexProgram needs to be serialized to another machine. Note that what is loaded is simply the instance state, not any processed data.

Popular methods of VertexProgram

getMemoryComputeKeys
The Memory keys that will be used during the computation. These are the only keys that can be read o
workerIterationEnd
This method is called at the end of each iteration of each "computational chunk." The set of vertice
workerIterationStart
This method is called at the start of each iteration of each "computational chunk." The set of verti
createVertexProgram
A helper method to construct a VertexProgram given the content of the supplied configuration. The cl
execute
This method denotes the main body of the computation and is executed on each vertex in the graph. Th
getMessageCombiner
Combine the messages in route to a particular vertex. Useful to reduce the amount of data transmitte
getVertexComputeKeys
The org.apache.tinkerpop.gremlin.structure.Element properties that will be mutated during the comput
setup
The method is called at the beginning of the computation. The method is global to the GraphComputer
terminate
The method is called at the end of each iteration to determine if the computation is complete. The m
getMapReducers
The set of MapReduce jobs that are associated with the VertexProgram. This is not necessarily the ex
storeState
When it is necessary to store the state of the VertexProgram, this method is called. This is typical
clone
When multiple workers on a single machine need VertexProgram instances, it is possible to use clone.

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How to use loadStatemethodin org.apache.tinkerpop.gremlin.process.computer.VertexProgram

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