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Uber Cadence Java Client
There is a newer version: 3.12.5
/*
 *  Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 *  Modifications copyright (C) 2017 Uber Technologies, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"). You may not
 *  use this file except in compliance with the License. A copy of the License is
 *  located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 *  or in the "license" file accompanying this file. This file is distributed on
 *  an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 *  express or implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 */

package com.uber.cadence.internal.sync;

import com.google.common.base.Defaults;
import com.uber.cadence.WorkflowExecution;
import com.uber.cadence.workflow.ChildWorkflowException;
import com.uber.cadence.workflow.ChildWorkflowOptions;
import com.uber.cadence.workflow.ChildWorkflowStub;
import com.uber.cadence.workflow.CompletablePromise;
import com.uber.cadence.workflow.Promise;
import com.uber.cadence.workflow.SignalExternalWorkflowException;
import com.uber.cadence.workflow.Workflow;
import com.uber.cadence.workflow.WorkflowInterceptor;
import com.uber.cadence.workflow.WorkflowInterceptor.WorkflowResult;
import java.lang.reflect.Type;
import java.util.Objects;

class ChildWorkflowStubImpl implements ChildWorkflowStub {

  private final String workflowType;
  private final ChildWorkflowOptions options;
  private final WorkflowInterceptor decisionContext;
  private final CompletablePromise execution;

  ChildWorkflowStubImpl(
      String workflowType, ChildWorkflowOptions options, WorkflowInterceptor decisionContext) {
    this.workflowType = Objects.requireNonNull(workflowType);
    this.options = new ChildWorkflowOptions.Builder(options).validateAndBuildWithDefaults();
    this.decisionContext = Objects.requireNonNull(decisionContext);
    this.execution = Workflow.newPromise();
  }

  @Override
  public String getWorkflowType() {
    return workflowType;
  }

  @Override
  public Promise getExecution() {
    return execution;
  }

  @Override
  public ChildWorkflowOptions getOptions() {
    return options;
  }

  @Override
  public  R execute(Class resultClass, Object... args) {
    return execute(resultClass, resultClass, args);
  }

  @Override
  public  R execute(Class resultClass, Type resultType, Object... args) {
    Promise result = executeAsync(resultClass, resultType, args);
    if (AsyncInternal.isAsync()) {
      AsyncInternal.setAsyncResult(result);
      return Defaults.defaultValue(resultClass);
    }
    try {
      return result.get();
    } catch (ChildWorkflowException e) {
      // Reset stack to the current one. Otherwise it is very confusing to see a stack of
      // an event handling method.
      e.setStackTrace(Thread.currentThread().getStackTrace());
      throw e;
    }
  }

  @Override
  public  Promise executeAsync(Class resultClass, Object... args) {
    return executeAsync(resultClass, resultClass, args);
  }

  @Override
  public  Promise executeAsync(Class resultClass, Type resultType, Object... args) {
    WorkflowResult result =
        decisionContext.executeChildWorkflow(workflowType, resultClass, resultType, args, options);
    execution.completeFrom(result.getWorkflowExecution());
    return result.getResult();
  }

  @Override
  public void signal(String signalName, Object... args) {
    Promise signaled =
        decisionContext.signalExternalWorkflow(execution.get(), signalName, args);
    if (AsyncInternal.isAsync()) {
      AsyncInternal.setAsyncResult(signaled);
      return;
    }
    try {
      signaled.get();
    } catch (SignalExternalWorkflowException e) {
      // Reset stack to the current one. Otherwise it is very confusing to see a stack of
      // an event handling method.
      e.setStackTrace(Thread.currentThread().getStackTrace());
      throw e;
    }
  }
}