| 1 | /* |
| 2 | * Copyright 2012-2013 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.springframework.batch.core.job.builder; |
| 17 | |
| 18 | import java.util.ArrayList; |
| 19 | import java.util.Arrays; |
| 20 | import java.util.Collection; |
| 21 | import java.util.HashMap; |
| 22 | import java.util.HashSet; |
| 23 | import java.util.List; |
| 24 | import java.util.Map; |
| 25 | import java.util.Set; |
| 26 | |
| 27 | import org.springframework.batch.core.ExitStatus; |
| 28 | import org.springframework.batch.core.Step; |
| 29 | import org.springframework.batch.core.job.flow.Flow; |
| 30 | import org.springframework.batch.core.job.flow.FlowExecutionStatus; |
| 31 | import org.springframework.batch.core.job.flow.JobExecutionDecider; |
| 32 | import org.springframework.batch.core.job.flow.State; |
| 33 | import org.springframework.batch.core.job.flow.support.SimpleFlow; |
| 34 | import org.springframework.batch.core.job.flow.support.StateTransition; |
| 35 | import org.springframework.batch.core.job.flow.support.state.DecisionState; |
| 36 | import org.springframework.batch.core.job.flow.support.state.EndState; |
| 37 | import org.springframework.batch.core.job.flow.support.state.FlowState; |
| 38 | import org.springframework.batch.core.job.flow.support.state.SplitState; |
| 39 | import org.springframework.batch.core.job.flow.support.state.StepState; |
| 40 | import org.springframework.core.task.TaskExecutor; |
| 41 | |
| 42 | /** |
| 43 | * A builder for a flow of steps that can be executed as a job or as part of a job. Steps can be linked together with |
| 44 | * conditional transitions that depend on the exit status of the previous step. |
| 45 | * |
| 46 | * @author Dave Syer |
| 47 | * |
| 48 | * @since 2.2 |
| 49 | * |
| 50 | * @param <Q> the type of object returned by the builder (by default a Flow) |
| 51 | * |
| 52 | */ |
| 53 | public class FlowBuilder<Q> { |
| 54 | |
| 55 | private String name; |
| 56 | |
| 57 | private String prefix; |
| 58 | |
| 59 | private List<StateTransition> transitions = new ArrayList<StateTransition>(); |
| 60 | |
| 61 | private Map<String, State> tos = new HashMap<String, State>(); |
| 62 | |
| 63 | private State currentState; |
| 64 | |
| 65 | private EndState failedState; |
| 66 | |
| 67 | private EndState completedState; |
| 68 | |
| 69 | private EndState stoppedState; |
| 70 | |
| 71 | private int decisionCounter = 0; |
| 72 | |
| 73 | private int splitCounter = 0; |
| 74 | |
| 75 | private int endCounter = 0; |
| 76 | |
| 77 | private Map<Object, State> states = new HashMap<Object, State>(); |
| 78 | |
| 79 | private SimpleFlow flow; |
| 80 | |
| 81 | private boolean dirty = true; |
| 82 | |
| 83 | public FlowBuilder(String name) { |
| 84 | this.name = name; |
| 85 | this.prefix = name + "."; |
| 86 | this.failedState = new EndState(FlowExecutionStatus.FAILED, prefix + "FAILED"); |
| 87 | this.completedState = new EndState(FlowExecutionStatus.COMPLETED, prefix + "COMPLETED"); |
| 88 | this.stoppedState = new EndState(FlowExecutionStatus.STOPPED, prefix + "STOPPED"); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Validate the current state of the builder and build a flow. Subclasses may override this to build an object of a |
| 93 | * different type that itself depends on the flow. |
| 94 | * |
| 95 | * @return a flow |
| 96 | */ |
| 97 | public Q build() { |
| 98 | @SuppressWarnings("unchecked") |
| 99 | Q result = (Q) flow(); |
| 100 | return result; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Transition to the next step on successful completion of the current step. All other outcomes are treated as |
| 105 | * failures. |
| 106 | * |
| 107 | * @param step the next step |
| 108 | * @return this to enable chaining |
| 109 | */ |
| 110 | public FlowBuilder<Q> next(Step step) { |
| 111 | doNext(step); |
| 112 | return this; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Start a flow. If some steps are already registered, just a synonym for {@link #from(Step)}. |
| 117 | * |
| 118 | * @param step the step to start with |
| 119 | * @return this to enable chaining |
| 120 | */ |
| 121 | public FlowBuilder<Q> start(Step step) { |
| 122 | doStart(step); |
| 123 | return this; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Go back to a previously registered step and start a new path. If no steps are registered yet just a synonym for |
| 128 | * {@link #start(Step)}. |
| 129 | * |
| 130 | * @param step the step to start from (already registered) |
| 131 | * @return this to enable chaining |
| 132 | */ |
| 133 | public FlowBuilder<Q> from(Step step) { |
| 134 | doFrom(step); |
| 135 | return this; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Transition to the decider on successful completion of the current step. All other outcomes are treated as |
| 140 | * failures. |
| 141 | * |
| 142 | * @param decider the JobExecutionDecider to determine the next step to execute |
| 143 | * @return this to enable chaining |
| 144 | */ |
| 145 | public UnterminatedFlowBuilder<Q> next(JobExecutionDecider decider) { |
| 146 | doNext(decider); |
| 147 | return new UnterminatedFlowBuilder<Q>(this); |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * If a flow should start with a decision use this as the first state. |
| 152 | * |
| 153 | * @param decider the to start from |
| 154 | * @return a builder to enable chaining |
| 155 | */ |
| 156 | public UnterminatedFlowBuilder<Q> start(JobExecutionDecider decider) { |
| 157 | doStart(decider); |
| 158 | return new UnterminatedFlowBuilder<Q>(this); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Start again from a decision that was already registered. |
| 163 | * |
| 164 | * @param decider the decider to start from (already registered) |
| 165 | * @return a builder to enable chaining |
| 166 | */ |
| 167 | public UnterminatedFlowBuilder<Q> from(JobExecutionDecider decider) { |
| 168 | doFrom(decider); |
| 169 | return new UnterminatedFlowBuilder<Q>(this); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Go next on successful completion to a subflow. |
| 174 | * |
| 175 | * @param flow the flow to go to |
| 176 | * @return a builder to enable chaining |
| 177 | */ |
| 178 | public FlowBuilder<Q> next(Flow flow) { |
| 179 | doNext(flow); |
| 180 | return this; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Start again from a subflow that was already registered. |
| 185 | * |
| 186 | * @param flow the flow to start from (already registered) |
| 187 | * @return a builder to enable chaining |
| 188 | */ |
| 189 | public FlowBuilder<Q> from(Flow flow) { |
| 190 | doFrom(flow); |
| 191 | return this; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * If a flow should start with a subflow use this as the first state. |
| 196 | * |
| 197 | * @param flow the flow to start from |
| 198 | * @return a builder to enable chaining |
| 199 | */ |
| 200 | public FlowBuilder<Q> start(Flow flow) { |
| 201 | doStart(flow); |
| 202 | return this; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * @param executor a task executor to execute the split flows |
| 207 | * @return a builder to enable fluent chaining |
| 208 | */ |
| 209 | public SplitBuilder<Q> split(TaskExecutor executor) { |
| 210 | return new SplitBuilder<Q>(this, executor); |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Start a transition to a new state if the exit status from the previous state matches the pattern given. |
| 215 | * Successful completion normally results in an exit status equal to (or starting with by convention) "COMPLETED". |
| 216 | * See {@link ExitStatus} for commonly used values. |
| 217 | * |
| 218 | * @param pattern the pattern of exit status on which to take this transition |
| 219 | * @return a builder to enable fluent chaining |
| 220 | */ |
| 221 | public TransitionBuilder<Q> on(String pattern) { |
| 222 | return new TransitionBuilder<Q>(this, pattern); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * A synonym for {@link #build()} which callers might find useful. Subclasses can override build to create an object |
| 227 | * of the desired type (e.g. a parent builder or an actual flow). |
| 228 | * |
| 229 | * @return the result of the builder |
| 230 | */ |
| 231 | public final Q end() { |
| 232 | return build(); |
| 233 | } |
| 234 | |
| 235 | protected Flow flow() { |
| 236 | if (!dirty) { |
| 237 | // optimization in case this method is called consecutively |
| 238 | return flow; |
| 239 | } |
| 240 | flow = new SimpleFlow(name); |
| 241 | // optimization for flows that only have one state that itself is a flow: |
| 242 | if (currentState instanceof FlowState && states.size() == 1) { |
| 243 | return ((FlowState) currentState).getFlows().iterator().next(); |
| 244 | } |
| 245 | addDanglingEndStates(); |
| 246 | flow.setStateTransitions(transitions); |
| 247 | dirty = false; |
| 248 | return flow; |
| 249 | } |
| 250 | |
| 251 | private void doNext(Object input) { |
| 252 | if (this.currentState == null) { |
| 253 | doStart(input); |
| 254 | } |
| 255 | State next = createState(input); |
| 256 | addTransition("COMPLETED", next); |
| 257 | addTransition("*", failedState); |
| 258 | this.currentState = next; |
| 259 | } |
| 260 | |
| 261 | private void doStart(Object input) { |
| 262 | if (this.currentState != null) { |
| 263 | doFrom(input); |
| 264 | } |
| 265 | this.currentState = createState(input); |
| 266 | } |
| 267 | |
| 268 | private void doFrom(Object input) { |
| 269 | if (currentState == null) { |
| 270 | doStart(input); |
| 271 | } |
| 272 | State state = createState(input); |
| 273 | tos.put(currentState.getName(), currentState); |
| 274 | this.currentState = state; |
| 275 | } |
| 276 | |
| 277 | private State createState(Object input) { |
| 278 | State result; |
| 279 | if (input instanceof Step) { |
| 280 | if (!states.containsKey(input)) { |
| 281 | Step step = (Step) input; |
| 282 | states.put(input, new StepState(prefix + step.getName(), step)); |
| 283 | } |
| 284 | result = states.get(input); |
| 285 | } |
| 286 | else if (input instanceof JobExecutionDecider) { |
| 287 | if (!states.containsKey(input)) { |
| 288 | states.put(input, new DecisionState((JobExecutionDecider) input, prefix + "decision" |
| 289 | + (decisionCounter++))); |
| 290 | } |
| 291 | result = states.get(input); |
| 292 | } |
| 293 | else if (input instanceof Flow) { |
| 294 | if (!states.containsKey(input)) { |
| 295 | states.put(input, new FlowState((Flow) input, prefix + ((Flow) input).getName())); |
| 296 | } |
| 297 | result = states.get(input); |
| 298 | } |
| 299 | else { |
| 300 | throw new FlowBuilderException("No state can be created for: " + input); |
| 301 | } |
| 302 | dirty = true; |
| 303 | return result; |
| 304 | } |
| 305 | |
| 306 | private SplitState createState(Collection<Flow> flows, TaskExecutor executor) { |
| 307 | if (!states.containsKey(flows)) { |
| 308 | states.put(flows, new SplitState(flows, prefix + "split" + (splitCounter++))); |
| 309 | } |
| 310 | SplitState result = (SplitState) states.get(flows); |
| 311 | if (executor != null) { |
| 312 | result.setTaskExecutor(executor); |
| 313 | } |
| 314 | dirty = true; |
| 315 | return result; |
| 316 | } |
| 317 | |
| 318 | private void addDanglingEndStates() { |
| 319 | Set<String> froms = new HashSet<String>(); |
| 320 | for (StateTransition transition : transitions) { |
| 321 | froms.add(transition.getState().getName()); |
| 322 | } |
| 323 | if (tos.isEmpty() && currentState != null) { |
| 324 | tos.put(currentState.getName(), currentState); |
| 325 | } |
| 326 | Map<String, State> copy = new HashMap<String, State>(tos); |
| 327 | // Find all the states that are really end states but not explicitly declared as such |
| 328 | for (String to : copy.keySet()) { |
| 329 | if (!froms.contains(to)) { |
| 330 | currentState = copy.get(to); |
| 331 | if (!currentState.isEndState()) { |
| 332 | addTransition("COMPLETED", completedState); |
| 333 | addTransition("*", failedState); |
| 334 | } |
| 335 | } |
| 336 | } |
| 337 | copy = new HashMap<String, State>(tos); |
| 338 | // Then find the states that do not have a default transition |
| 339 | for (String from : copy.keySet()) { |
| 340 | currentState = copy.get(from); |
| 341 | if (!currentState.isEndState()) { |
| 342 | if (!hasFail(from)) { |
| 343 | addTransition("*", failedState); |
| 344 | } |
| 345 | if (!hasCompleted(from)) { |
| 346 | addTransition("*", completedState); |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | private boolean hasFail(String from) { |
| 353 | return matches(from, "FAILED"); |
| 354 | } |
| 355 | |
| 356 | private boolean hasCompleted(String from) { |
| 357 | return matches(from, "COMPLETED"); |
| 358 | } |
| 359 | |
| 360 | private boolean matches(String from, String status) { |
| 361 | for (StateTransition transition : transitions) { |
| 362 | if (from.equals(transition.getState().getName()) && transition.matches(status)) { |
| 363 | return true; |
| 364 | } |
| 365 | } |
| 366 | return false; |
| 367 | } |
| 368 | |
| 369 | private void addTransition(String pattern, State next) { |
| 370 | tos.put(next.getName(), next); |
| 371 | transitions.add(StateTransition.createStateTransition(currentState, pattern, next.getName())); |
| 372 | if (transitions.size() == 1) { |
| 373 | transitions.add(StateTransition.createEndStateTransition(failedState)); |
| 374 | transitions.add(StateTransition.createEndStateTransition(completedState)); |
| 375 | transitions.add(StateTransition.createEndStateTransition(stoppedState)); |
| 376 | } |
| 377 | if (next.isEndState()) { |
| 378 | transitions.add(StateTransition.createEndStateTransition(next)); |
| 379 | } |
| 380 | dirty = true; |
| 381 | } |
| 382 | |
| 383 | private void stop(String pattern) { |
| 384 | addTransition(pattern, stoppedState); |
| 385 | } |
| 386 | |
| 387 | private void stop(String pattern, State restart) { |
| 388 | EndState next = new EndState(FlowExecutionStatus.STOPPED, "STOPPED", prefix + "stop" + (endCounter++), true); |
| 389 | addTransition(pattern, next); |
| 390 | currentState = next; |
| 391 | addTransition("*", restart); |
| 392 | } |
| 393 | |
| 394 | private void end(String pattern) { |
| 395 | addTransition(pattern, completedState); |
| 396 | } |
| 397 | |
| 398 | private void end(String pattern, String code) { |
| 399 | addTransition(pattern, new EndState(FlowExecutionStatus.COMPLETED, code, prefix + "end" + (endCounter++))); |
| 400 | } |
| 401 | |
| 402 | private void fail(String pattern) { |
| 403 | addTransition(pattern, failedState); |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * A builder for continuing a flow from a decision state. |
| 408 | * |
| 409 | * @author Dave Syer |
| 410 | * |
| 411 | * @param <Q> the result of the builder's build() |
| 412 | */ |
| 413 | public static class UnterminatedFlowBuilder<Q> { |
| 414 | |
| 415 | private final FlowBuilder<Q> parent; |
| 416 | |
| 417 | public UnterminatedFlowBuilder(FlowBuilder<Q> parent) { |
| 418 | this.parent = parent; |
| 419 | } |
| 420 | |
| 421 | /** |
| 422 | * Start a transition to a new state if the exit status from the previous state matches the pattern given. |
| 423 | * Successful completion normally results in an exit status equal to (or starting with by convention) |
| 424 | * "COMPLETED". See {@link ExitStatus} for commonly used values. |
| 425 | * |
| 426 | * @param pattern the pattern of exit status on which to take this transition |
| 427 | * @return a TransitionBuilder |
| 428 | */ |
| 429 | public TransitionBuilder<Q> on(String pattern) { |
| 430 | return new TransitionBuilder<Q>(parent, pattern); |
| 431 | } |
| 432 | |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * A builder for transitions within a flow. |
| 437 | * |
| 438 | * @author Dave Syer |
| 439 | * |
| 440 | * @param <Q> the result of the parent builder's build() |
| 441 | */ |
| 442 | public static class TransitionBuilder<Q> { |
| 443 | |
| 444 | private final FlowBuilder<Q> parent; |
| 445 | |
| 446 | private final String pattern; |
| 447 | |
| 448 | public TransitionBuilder(FlowBuilder<Q> parent, String pattern) { |
| 449 | this.parent = parent; |
| 450 | this.pattern = pattern; |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * Specify the next step. |
| 455 | * |
| 456 | * @param step the next step after this transition |
| 457 | * @return a FlowBuilder |
| 458 | */ |
| 459 | public FlowBuilder<Q> to(Step step) { |
| 460 | State next = parent.createState(step); |
| 461 | parent.addTransition(pattern, next); |
| 462 | parent.currentState = next; |
| 463 | return parent; |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * Specify the next state as a complete flow. |
| 468 | * |
| 469 | * @param flow the next flow after this transition |
| 470 | * @return a FlowBuilder |
| 471 | */ |
| 472 | public FlowBuilder<Q> to(Flow flow) { |
| 473 | State next = parent.createState(flow); |
| 474 | parent.addTransition(pattern, next); |
| 475 | parent.currentState = next; |
| 476 | return parent; |
| 477 | } |
| 478 | |
| 479 | /** |
| 480 | * Specify the next state as a decision. |
| 481 | * |
| 482 | * @param decider the decider to determine the next step |
| 483 | * @return a FlowBuilder |
| 484 | */ |
| 485 | public FlowBuilder<Q> to(JobExecutionDecider decider) { |
| 486 | State next = parent.createState(decider); |
| 487 | parent.addTransition(pattern, next); |
| 488 | parent.currentState = next; |
| 489 | return parent; |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * Signal the successful end of the flow. |
| 494 | * |
| 495 | * @return a FlowBuilder |
| 496 | */ |
| 497 | public FlowBuilder<Q> stop() { |
| 498 | parent.stop(pattern); |
| 499 | return parent; |
| 500 | } |
| 501 | |
| 502 | /** |
| 503 | * Stop the flow and provide a flow to start with if the flow is restarted. |
| 504 | * |
| 505 | * @param flow the flow to restart with |
| 506 | * @return a FlowBuilder |
| 507 | */ |
| 508 | public FlowBuilder<Q> stopAndRestart(Flow flow) { |
| 509 | State next = parent.createState(flow); |
| 510 | parent.stop(pattern, next); |
| 511 | return parent; |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * Stop the flow and provide a decider to start with if the flow is restarted. |
| 516 | * |
| 517 | * @param decider a decider to restart with |
| 518 | * @return a FlowBuilder |
| 519 | */ |
| 520 | public FlowBuilder<Q> stopAndRestart(JobExecutionDecider decider) { |
| 521 | State next = parent.createState(decider); |
| 522 | parent.stop(pattern, next); |
| 523 | return parent; |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * Stop the flow and provide a step to start with if the flow is restarted. |
| 528 | * |
| 529 | * @param restart the step to restart with |
| 530 | * @return a FlowBuilder |
| 531 | */ |
| 532 | public FlowBuilder<Q> stopAndRestart(Step restart) { |
| 533 | State next = parent.createState(restart); |
| 534 | parent.stop(pattern, next); |
| 535 | return parent; |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * Signal the successful end of the flow. |
| 540 | * |
| 541 | * @return a FlowBuilder |
| 542 | */ |
| 543 | public FlowBuilder<Q> end() { |
| 544 | parent.end(pattern); |
| 545 | return parent; |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * Signal the end of the flow with the status provided. |
| 550 | * |
| 551 | * @return a FlowBuilder |
| 552 | */ |
| 553 | public FlowBuilder<Q> end(String status) { |
| 554 | parent.end(pattern, status); |
| 555 | return parent; |
| 556 | } |
| 557 | |
| 558 | /** |
| 559 | * Signal the end of the flow with an error condition. |
| 560 | * |
| 561 | * @return a FlowBuilder |
| 562 | */ |
| 563 | public FlowBuilder<Q> fail() { |
| 564 | parent.fail(pattern); |
| 565 | return parent; |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * A builder for building a split state. Example (<code>builder</code> is a {@link FlowBuilder}): |
| 571 | * |
| 572 | * <pre> |
| 573 | * Flow splitFlow = builder.start(flow1).split(new SyncTaskExecutor()).add(flow2).build(); |
| 574 | * </pre> |
| 575 | * |
| 576 | * where <code>flow1</code> and <code>flow2</code> will be executed (one after the other because of the task |
| 577 | * executor that was added). Another example |
| 578 | * |
| 579 | * <pre> |
| 580 | * Flow splitFlow = builder.start(step1).split(new SimpleAsyncTaskExecutor()).add(flow).build(); |
| 581 | * </pre> |
| 582 | * |
| 583 | * In this example, a flow consisting of <code>step1</code> will be executed in parallel with <code>flow</code>. |
| 584 | * |
| 585 | * @author Dave Syer |
| 586 | * |
| 587 | * @param <Q> the result of the parent builder's build() |
| 588 | */ |
| 589 | public static class SplitBuilder<Q> { |
| 590 | |
| 591 | private final FlowBuilder<Q> parent; |
| 592 | |
| 593 | private TaskExecutor executor; |
| 594 | |
| 595 | /** |
| 596 | * @param parent the parent builder |
| 597 | * @param executor the task executor to use in the split |
| 598 | */ |
| 599 | public SplitBuilder(FlowBuilder<Q> parent, TaskExecutor executor) { |
| 600 | this.parent = parent; |
| 601 | this.executor = executor; |
| 602 | } |
| 603 | |
| 604 | /** |
| 605 | * Add flows to the split, in addition to the current state already present in the parent builder. |
| 606 | * |
| 607 | * @param flows more flows to add to the split |
| 608 | * @return the parent builder |
| 609 | */ |
| 610 | public FlowBuilder<Q> add(Flow... flows) { |
| 611 | Collection<Flow> list = new ArrayList<Flow>(Arrays.asList(flows)); |
| 612 | String name = "split" + (parent.splitCounter++); |
| 613 | int counter = 0; |
| 614 | State one = parent.currentState; |
| 615 | Flow flow = null; |
| 616 | if (!(one instanceof FlowState)) { |
| 617 | FlowBuilder<Flow> stateBuilder = new FlowBuilder<Flow>(name + "_" + (counter++)); |
| 618 | stateBuilder.currentState = one; |
| 619 | flow = stateBuilder.build(); |
| 620 | } |
| 621 | if (flow != null) { |
| 622 | list.add(flow); |
| 623 | } |
| 624 | State next = parent.createState(list, executor); |
| 625 | parent.currentState = next; |
| 626 | return parent; |
| 627 | } |
| 628 | |
| 629 | } |
| 630 | |
| 631 | } |