stepchain

stepchain 通用业务流程流水线处理框架。

类似于Commons Chain和Commons Pipeline这样的Java Pipeline Step Chain用于组织复杂处理流程执行的流行技术。

Java Pipeline Step Chain like Apache Commons Chain and Commons Pipeline。 A popular technique for organizing the execution of complex processing flows is the "Chain of Responsibility" pattern。

gitee: https://gitee.com/zengfr/stepchain

github: https://github.com/zengfr/stepchain-spring-boot-starter/

Repositories Central Sonatype Mvnrepository

Feature:
1、支持通用业务job、services子流程无限制拆分。
2、支持业务子流程串行化、业务子流程并行化，可配置化。
3、支持Config业务子流程开启或禁用、配置串行或并行以及并行数的统一配置。
4、支持业务流程以及子流程任意无限嵌套。
5、支持配置中心、缓存、统一数据接口、redis、Es、日志Trace等。
6、支持并行分支，支持条件分支if/else、switch、loop子流程.
7、支持Processor定时调度FixedRate、FixedDelay。
备注：只开源了通用部分(不影响使用),去除了有关框架组件包括：配置中心、缓存中心、数据接口以及业务相关DataMiddle等部分API。

Maven Dependency:
Maven(Not Use Spring Boot):
<dependency>
 <groupId>com.github.zengfr.project</groupId>
 <artifactId>stepchain</artifactId>
 <version>0.0.7</version>
<dependency>
Maven(Use Spring Boot):
<dependency>
 <groupId>com.github.zengfr.project</groupId>
 <artifactId>stepchain-spring-boot-starter</artifactId>
 <version>0.0.7</version>
<dependency>
Gradle:
compile group: 'com.github.zengfr.project', name: 'stepchain', version: '0.0.7'
compile group: 'com.github.zengfr.project', name: 'stepchain-spring-boot-starter', version: '0.0.7'

interface Pipeline ChainBuilder StepBuilder Step Chain javadoc api文档 

1、StepChain 的中心思想是什么?如何做到通用的?
答: 
1.1、任何业务逻辑处理抽象成1\input输入 2\ processor处理器 3\output输出.中间过程结果产生和组合成dataMiddle。
1.2、任何业务逻辑处理使用多个processor组合执行。

2、StepChain 如何并行和串行执行多个processor?
答: 
串行step=pipeline.createStep();step.put(processors);//processors串行执行.
并行step=pipeline.createStep(4);step.put(processors);//processors同时4个并行执行.

3、Stepchain 如何创建processor?
  3.1、实现 IProcessor 接口。
  3.2、使用IProcessorBuilder：
    <I> IProcessor<I, Boolean> createProcessor(Predicate<I> predicate);
    <I> IProcessor<I, Boolean> createProcessor(Consumer<I> consumer);
    <I, O> IProcessor<I, O> createProcessor(Function<I, O> func);

4、StepChain 如何复用和组合processor?
  4.1、使用IChainBuilder、IChain:
  4.2、使用IProcessorBuilder：
    <A, B, C> IProcessor<A, C> createProcessor(IProcessor<A, B> first, IProcessor<B, C> second);
    <A, B, C, D> IProcessor<A, D> createProcessor(IProcessor<A, B> processor1, IProcessor<B, C> processor2, IProcessor<C, D> processor3);

5、StepChain 如何按条件复用和组合processor?
答: 
case1、已有trueProcessor\falseProcessor2个 创建 validator 则按条件执行2则之1.
IConditionSelectorProcessor<String, Boolean, String> p3 = pipeline.createConditionValidatorProcessor(validator, trueProcessor, falseProcessor);

case2、已有processor 创建 validator 创建循环执行体，validator 返回false时终止执行。
IConditionLoopProcessor<String, String> p2 = pipeline.createConditionLoopProcessor(validator, processor);

case3、已有processor创建 switch 逻辑，根据selector返回的key执行某1分支branchProcessor如果返回的key不在分支中 则执行默认key对应的分支branchProcessor。
IConditionSelectorProcessor<String, String, String> p1 = pipeline.createConditionSelectorProcessor(selector);
p1.setBranch(S key, IProcessor<I, O> processor);
p1setDefaultBranch(S key);

case4、已有processor创建 if/else if/else  逻辑，根据validator返回的结果与result对比一致则执行分支branchProcessor，如果没有返回一致的 则执行默认分支branchProcessor。
pipeline.createConditionValidatorSelectorProcessor();
public interface IConditionValidatorSelectorProcessor<I,O> extends IProcessor<I, O> {
   void setBranch(IProcessor<I, Boolean> validator,Boolean result,IProcessor<I, O> processor);
   void setDefaultBranch(IProcessor<I, O> processor);
}

public interface IStep<I> extends IStepProcessor<I> {
	void put(IStepProcessor<I> processor);

	void put(IStepProcessor<I>... processorArray);

	void put(Collection<StepProcessor<I>> processors);

	void put(IProcessor<I, Boolean> processor);

	void put(IProcessor<I, Boolean>... processorArray);

	void put(IChain<I, Boolean> chain);

	void put(IChain<I, Boolean>... processorArray);

	void put(Function<I, Boolean> func);

	void put(Function<I, Boolean>... processorArray);
}
public interface IChain<A, B> extends IProcessor<A, B> {
	<C> IChain<A, C> next(IProcessor<B, C> process);

	<C> IChain<A, C> next(Function<B, C> func);
}
public interface IChainBuilder {
	<A, B> IChain<A, B> createChain(Function<A, B> func);

	<A, B> IChain<A, B> createChain(IProcessor<A, B> processor);

	<A, B, C> IChain<A, C> createChain(IProcessor<A, B> processor1, IProcessor<B, C> processor2);
}
public interface IStepBuilder {
	<T> IStep<T> createStep();

	<T> IStep<T> createStep(int parallelCount);

	<T> IStep<T> createStep(String parallelCountConfigName);
}

StepChainSpringBootTest.java

PipelineTest.java 
Demo&Test you can use AbstractProcessor AbstractStepProcessor

import com.github.zengfr.project.stepchain
abstract class AbstractProcessor<I, O> implements Processor<I, O>{}
abstract class AbstractStepProcessor<A> extends AbstractProcessor<A, Boolean> implements StepProcessor<A>{}

import com.github.zengfr.project.stepchain.Chain;
import com.github.zengfr.project.stepchain.Pipeline;
import com.github.zengfr.project.stepchain.Step;
import com.github.zengfr.project.stepchain.context.ContextBuilder;
import com.github.zengfr.project.stepchain.context.UnaryContext;
import com.github.zengfr.project.stepchain.test.context.SetProductContext;
import com.github.zengfr.project.stepchain.test.context.SetProductDataMiddle;
import com.github.zengfr.project.stepchain.test.processor.DiscountProcessor;
import com.github.zengfr.project.stepchain.test.processor.FeeProcessor;
import com.github.zengfr.project.stepchain.test.processor.IncreaseProcessor;
import com.github.zengfr.project.stepchain.test.processor.InitProcessor;
import com.github.zengfr.project.stepchain.test.processor.TaxProcessor;

public class PipelineTest {
public static void testPipeline(IPipeline pipeline) throws Exception {
    //Demo精简版 只开源了通用部分(不影响使用)
	SetProductRequest req = new SetProductRequest();
	SetProductResponse resp = new SetProductResponse();
	SetProductDataMiddle middle = new SetProductDataMiddle();

	SetProductContext context = new SetProductContext(req, middle, resp);
	IStep<SetProductContext> step = pipeline.createStep();
	step.put(new InitProcessor());
	step.put(new TaxProcessor());
	step.put(new FeeProcessor());
	step.put(new IncreaseProcessor());
	step.put(new DiscountProcessor());
	step.put((c) -> {
		c.middle.Price += 10;
		return true;
	});
	step.process(context);
	System.out.println(context.middle.Price);
	}

	public static void testPipeline2(IPipeline pipeline) throws Exception {
	Function<UnaryContext<Integer>, Boolean> func = (context) -> {
			if (context.context == null)
				context.context = 1;
			context.context += 1;
			return true;

		};
		Function<UnaryContext<Integer>, String> func3 = (context) -> {
			if (context.context == null)
				context.context = 1;
			context.context += 1;
			return JSON.toJSONString(context.context);

		};
		UnaryContext<Integer> context = pipeline.createContext(12345678);
		IStep<UnaryContext<Integer>> step = pipeline.createStep();
		IStep<UnaryContext<Integer>> step2 = pipeline.createStep();
		IChain<UnaryContext<Integer>, Boolean> c2 = pipeline.createChain(func);
		 
		IChain<UnaryContext<Integer>, String> c3 = pipeline.createChain(func3);
		Function<String, Integer> func4 = null;
		Function<Integer, String> func5 = null;
		Function<String, Boolean> func6 = null;
		IChain<String,Integer > c4 = pipeline.createChain(func4);
		IChain<Integer, String> c5 = pipeline.createChain(func5);
		IChain<String, Boolean> c6 = pipeline.createChain(func6);
		IChain<UnaryContext<Integer>, Boolean> c7 = c3.next(c4).next(c5).next(c6);
		
		step2.put(c2);
		step2.put(step);
		step2.put(func);
		//step2.put(c7);
		
		step2.process(context);
		System.out.println(context.context);
	}
	public static void testPipeline3(IPipeline pipeline) throws Exception {
		IProcessor<String, String> selector = null;
		IProcessor<String, Boolean> validator = null;

		IProcessor<String, String> processor = null;
		IProcessor<String, String> first = null;
		IProcessor<String, String> second = null;

		IConditionSelectorProcessor<String, Boolean, String> p3 = pipeline.createConditionValidatorProcessor(validator, first, second);
		IConditionLoopProcessor<String, String> p2 = pipeline.createConditionLoopProcessor(validator, processor);

		IConditionSelectorProcessor<String, String, String> p1 = pipeline.createConditionSelectorProcessor(selector);
	}

@RunWith(SpringRunner.class)
@SpringBootTest(classes = StepChainTestApplication.class)
public class StepChainSpringBootTest {
	@Autowired
	protected IPipeline pipeline;
	@Test
	public void testPipeline() throws Exception {
	PipelineTest.testPipeline(pipeline);
	}
	@Test
	public void testPipeline2() throws Exception {
	PipelineTest.testPipeline2(pipeline);
	}