How to use

getMapReducers

method

in

org.apache.tinkerpop.gremlin.process.computer.VertexProgram

this.mapReduces.addAll(this.vertexProgram.getMapReducers());

this.mapReduces.addAll(this.vertexProgram.getMapReducers());

protected void validateStatePriorToExecution() {
  // a graph computer can only be executed one time
  if (this.executed)
    throw Exceptions.computerHasAlreadyBeenSubmittedAVertexProgram();
  else
    this.executed = true;
  // it is not possible execute a computer if it has no vertex program nor mapreducers
  if (null == this.vertexProgram && this.mapReducers.isEmpty())
    throw GraphComputer.Exceptions.computerHasNoVertexProgramNorMapReducers();
  // it is possible to run mapreducers without a vertex program
  if (null != this.vertexProgram) {
    GraphComputerHelper.validateProgramOnComputer(this, vertexProgram);
    this.mapReducers.addAll(this.vertexProgram.getMapReducers());
  }
  // if the user didn't set desired persistence/resultgraph, then get from vertex program or else, no persistence
  this.persist = GraphComputerHelper.getPersistState(Optional.ofNullable(this.vertexProgram), Optional.ofNullable(this.persist));
  this.resultGraph = GraphComputerHelper.getResultGraphState(Optional.ofNullable(this.vertexProgram), Optional.ofNullable(this.resultGraph));
  // determine persistence and result graph options
  if (!this.features().supportsResultGraphPersistCombination(this.resultGraph, this.persist))
    throw GraphComputer.Exceptions.resultGraphPersistCombinationNotSupported(this.resultGraph, this.persist);
  // if too many workers are requested, throw appropriate exception
  if (this.workers > this.features().getMaxWorkers())
    throw GraphComputer.Exceptions.computerRequiresMoreWorkersThanSupported(this.workers, this.features().getMaxWorkers());
}

this.mapReducers.addAll(this.vertexProgram.getMapReducers());

protected void validateStatePriorToExecution() {
  // a graph computer can only be executed one time
  if (this.executed)
    throw Exceptions.computerHasAlreadyBeenSubmittedAVertexProgram();
  else
    this.executed = true;
  // it is not possible execute a computer if it has no vertex program nor mapreducers
  if (null == this.vertexProgram && this.mapReducers.isEmpty())
    throw GraphComputer.Exceptions.computerHasNoVertexProgramNorMapReducers();
  // it is possible to run mapreducers without a vertex program
  if (null != this.vertexProgram) {
    GraphComputerHelper.validateProgramOnComputer(this, vertexProgram);
    this.mapReducers.addAll(this.vertexProgram.getMapReducers());
  }
  // if the user didn't set desired persistence/resultgraph, then get from vertex program or else, no persistence
  this.persist = GraphComputerHelper.getPersistState(Optional.ofNullable(this.vertexProgram), Optional.ofNullable(this.persist));
  this.resultGraph = GraphComputerHelper.getResultGraphState(Optional.ofNullable(this.vertexProgram), Optional.ofNullable(this.resultGraph));
  // determine persistence and result graph options
  if (!this.features().supportsResultGraphPersistCombination(this.resultGraph, this.persist))
    throw GraphComputer.Exceptions.resultGraphPersistCombinationNotSupported(this.resultGraph, this.persist);
  // if too many workers are requested, throw appropriate exception
  if (this.workers > this.features().getMaxWorkers())
    throw GraphComputer.Exceptions.computerRequiresMoreWorkersThanSupported(this.workers, this.features().getMaxWorkers());
}

this.mapReduces.addAll(this.vertexProgram.getMapReducers());

this.mapReducers.addAll(this.vertexProgram.getMapReducers());

this.mapReducers.addAll(this.vertexProgram.getMapReducers());