├── .circleci └── config.yml ├── .gitignore ├── LICENSE ├── README.md ├── docs ├── approval.png └── expression.png ├── plugin ├── pom.xml └── src │ └── main │ └── java │ └── com │ └── lambdaschmiede │ └── camunda │ └── clojure │ ├── ClojureFunctionMapper.java │ └── ClojureProcessEnginePlugin.java ├── pom.xml └── test ├── delegate.clj ├── pom.xml └── src └── test ├── java └── com │ └── lambdaschmiede │ └── camunda │ └── clojure │ └── ProcessEngineTest.java └── resources ├── camunda.cfg.xml ├── logback-test.xml └── test-process.bpmn /.circleci/config.yml: -------------------------------------------------------------------------------- 1 | version: 2.1 2 | 3 | orbs: 4 | maven: circleci/maven@1.2.0 5 | 6 | jobs: 7 | test: 8 | docker: 9 | - image: circleci/openjdk:stretch 10 | steps: 11 | - checkout 12 | - run: mvn test 13 | 14 | workflows: 15 | test-and-build: 16 | jobs: 17 | - test 18 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled class file 2 | *.class 3 | target/ 4 | .idea/ 5 | *.iml 6 | .project 7 | .classpath 8 | .settings/ 9 | # Log file 10 | *.log 11 | .DS_Store 12 | # BlueJ files 13 | *.ctxt 14 | 15 | # Mobile Tools for Java (J2ME) 16 | .mtj.tmp/ 17 | 18 | # Package Files # 19 | *.jar 20 | *.war 21 | *.nar 22 | *.ear 23 | *.zip 24 | *.tar.gz 25 | *.rar 26 | 27 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 28 | hs_err_pid* 29 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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If we want to call Clojure code as a Delegate, we need to create and compile a Java class from Clojure, so that it can be found by Camunda via the classloader. This does not go well with the REPL development flow. This project is an approach to call pure Clojure functions from Camunda process instances, without having to extend BPMN or Camunda itself. 9 | 10 | ## How does it work? 11 | This Process Engine plugin registers a `org.camunda.bpm.engine.impl.javax.el.FunctionMapper` which can be referred to as a `DelegateExpression` from the BPMN file. It provides the UEL function `clj:delegate`, which accepts a string parameter, which can point to any Clojure function accepting a single parameter. This parameter passed will be an instance from Camundas `DelegateExecution` class. As an example, the delegate expression `${clj:delegate('example.camunda/test-delegate')}` will call the function `test-delegate` in the namespace `example.camunda`, which might look like this: 12 | 13 | ```clojure 14 | (defn test-delegate [execution] 15 | (do 16 | (println (str "The instance is " (.getProcessInstanceId execution))) 17 | (.setVariable execution "var-name" 2))) 18 | ``` 19 | 20 | This has the following benefits: 21 | * No customizing of BPMN. The default Camunda modeler and Cockpit just work 22 | * No customizing of Camunda. No fork is needed, we can just make use of any Camunda version we like 23 | * No Java Interop Code. We can define our delegates as plain clojure functions 24 | * Full REPL integration. We can adjust the Clojure delegate functions in the REPL on the fly and test them instantly with Camunda 25 | 26 | ## What can it do? 27 | 28 | ### Use Clojure functions via Delegate expression 29 | If you want to call Java code from Camunda in a service task, there are two common ways: 30 | 1. Configure the service task to be a Java Delegate and provide the fully qualified classname to a Java Delegate implementation 31 | 2. Configure the service task to be a Delegate Expression and provide a UEL-Expression which points to a Java Delegate implementation 32 | 33 | Both cases work with Java Delegates, which are Java classes which implement the `org.camunda.bpm.engine.delegate.JavaDelegate` interface. This interface only has one method: 34 | 35 | ``` java 36 | public interface JavaDelegate { 37 | 38 | void execute(DelegateExecution execution) throws Exception; 39 | 40 | } 41 | ``` 42 | 43 | When the Process Engine handles this task, the method gets called and the process instance state is passed as a parameter of the type `DelegateExecution`. Developers can then extract variables from the execution or pass new ones into it (it is stateful!). As described above, geneating Java classes from Clojure in a way that the classloader can find them comes with a lot of overhead. We decided to make use of the Delegate Expressio mechanism to call Clojure Functions directly from Camunda. To achieve this, a service task needs to be configured as a 'Delegate Expression', and the EL function `clj:delegate` needs to point to a Clojure function which accepts a single parameter: 44 | 45 | ![Camunda Service Task with a Delegate Expression](docs/approval.png "Delegate Expression") 46 | 47 | The function `write-approval` in the namespace `myapp.camunda` then might look like this: 48 | 49 | ``` clojure 50 | (ns myapp.camunda 51 | (:require [myabb.db :refer [save-approval!]])) 52 | 53 | (defn write-approval [execution] 54 | (let [{:strs requestee from to} (.getVariables execution)] 55 | (save-approval! requestee from to))) 56 | ``` 57 | 58 | ### Use Clojure functions in EL-Expressions 59 | Expressions are used in many different places in Camunda process definitions. One example is evaluating complex expressions to determine which way a Gateway should use. With the EL function `clj:function` we can provide a plain Clojure function and call it parameterized. The EL function accepts the Clojure function as the first parameter and all parameters as the following parameters: 60 | 61 | ![Camunda Sequence Flow with a expression relating to clojure.core/pos?](docs/expression.png "EL Expression") 62 | 63 | The example shows that this really works with every function, even functions from `clojure.core`. 64 | 65 | ## How can it be configured? 66 | When bootstrapping the Camunda engine in your Clojure program, you have to add the plugin class to the engine like this: 67 | 68 | ``` clojure 69 | (-> engine-config 70 | (.getProcessEnginePlugins) 71 | (.add (com.lambdaschmiede.camunda.clojure.ClojureProcessEnginePlugin.))) 72 | ``` 73 | 74 | The library is available on Clojars: `[com.lambdaschmiede/camunda-clojure-plugin "1.0"]` 75 | 76 | 77 | ## How stable is this? 78 | Currently this implementation is only used by lambdaschmiede itself, although are presenting it to customers using Camunda. It works in our projects, and we will keep maintaining it to guarantee a stable library for our own use. Stability and non-breaking changes is one of our main goals for this library. 79 | 80 | ## What's up next? 81 | We'd like to also provide a similar way to create Execution Listeners and Task Listeners in the future or add some helper functions, if we have code in our own software that gets repeated a lot. 82 | -------------------------------------------------------------------------------- /docs/approval.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/lambdaschmiede/camunda-clojure-plugin/b75bff8e7373851a06e7788ef5cc946b162aa0c1/docs/approval.png -------------------------------------------------------------------------------- /docs/expression.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/lambdaschmiede/camunda-clojure-plugin/b75bff8e7373851a06e7788ef5cc946b162aa0c1/docs/expression.png -------------------------------------------------------------------------------- /plugin/pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 4.0.0 6 | 7 | com.lambdaschmiede 8 | camunda-clojure-plugin 9 | camunda-clojure-plugin 10 | 1.2-SNAPSHOT 11 | 12 | 13 | 11 14 | 11 15 | 16 | 17 | https://github.com/lambdaschmiede/camunda-clojure-plugin 18 | 19 | 20 | 21 | Apache License, Version 2.0 22 | https://www.apache.org/licenses/LICENSE-2.0.txt 23 | repo 24 | 25 | 26 | 27 | 28 | lambdaschmiede GmbH 29 | https://www.lambdaschmiede.com 30 | 31 | 32 | 33 | https://github.com/lambdaschmiede/camunda-clojure-plugin 34 | scm:git:git@github.com:lambdaschmiede/camunda-clojure-plugin.git 35 | 36 | 37 | jar 38 | 39 | 40 | 41 | 42 | org.camunda.bpm 43 | camunda-bom 44 | 7.15.0 45 | import 46 | pom 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | org.camunda.bpm 55 | camunda-engine 56 | provided 57 | 58 | 59 | 60 | org.clojure 61 | clojure 62 | 1.10.3 63 | provided 64 | 65 | 66 | 67 | 68 | 69 | 70 | maven-assembly-plugin 71 | 72 | 73 | package 74 | 75 | single 76 | 77 | 78 | 79 | 80 | 81 | jar-with-dependencies 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | clojars 91 | Clojars repository 92 | https://clojars.org/repo 93 | 94 | 95 | 96 | 97 | -------------------------------------------------------------------------------- /plugin/src/main/java/com/lambdaschmiede/camunda/clojure/ClojureFunctionMapper.java: -------------------------------------------------------------------------------- 1 | package com.lambdaschmiede.camunda.clojure; 2 | 3 | import clojure.java.api.Clojure; 4 | import clojure.lang.IFn; 5 | 6 | import org.camunda.bpm.engine.delegate.JavaDelegate; 7 | import org.camunda.bpm.engine.impl.el.CommandContextFunctionMapper; 8 | import org.camunda.bpm.engine.impl.javax.el.FunctionMapper; 9 | import org.camunda.bpm.engine.impl.util.ReflectUtil; 10 | 11 | import java.lang.reflect.Method; 12 | import java.util.HashMap; 13 | import java.util.Map; 14 | 15 | /** 16 | * A Function mapper which provides the 'clj(arg)' function to Camundas UEL 17 | * context. 18 | * 19 | * The argument is a string, referencing a Clojure function with its qualified 20 | * name. The targeted function has to accept exactly one parameter. This 21 | * parameter will be passed by the engine as an instance of DelegateExecution. 22 | */ 23 | public class ClojureFunctionMapper extends FunctionMapper { 24 | 25 | private static Map FUNCTION_MAP = new HashMap<>(); 26 | private static final IFn REQUIRE = Clojure.var("clojure.core", "require"); 27 | private static final String KEY_DELEGATE = "delegate"; 28 | private static final String KEY_FUNCTION = "function"; 29 | private static final String KEY_PREFIX = "clj"; 30 | private static final String NS_SEPARATOR = "/"; 31 | 32 | /** 33 | * Camunda will query this method on a list of registered FunctionMapper 34 | * instances with a UEL expression until the first one returns a value. This 35 | * function checks if the localName of the UEL expression is called 'clj'. If 36 | * so, it returns a reference to the static method 'eval' in this same class. 37 | * 38 | * If the localName does not match, it returns null and Camunda will query the 39 | * next FunctionMapper instance in its list 40 | */ 41 | @Override 42 | public Method resolveFunction(String prefix, String localName) { 43 | if (!KEY_PREFIX.equals(prefix)) { 44 | return null; 45 | } 46 | initializeFunctionMapIfEmpty(); 47 | return FUNCTION_MAP.get(localName); 48 | } 49 | 50 | private void initializeFunctionMapIfEmpty() { 51 | if (FUNCTION_MAP.isEmpty()) { 52 | synchronized (CommandContextFunctionMapper.class) { 53 | if (FUNCTION_MAP.isEmpty()) { 54 | FUNCTION_MAP.put(KEY_DELEGATE, 55 | ReflectUtil.getMethod(ClojureFunctionMapper.class, KEY_DELEGATE, String.class)); 56 | FUNCTION_MAP.put(KEY_FUNCTION, 57 | ReflectUtil.getMethod(ClojureFunctionMapper.class, KEY_FUNCTION, String.class, Object[].class)); 58 | } 59 | } 60 | } 61 | } 62 | 63 | /** 64 | * Receives the expression which is passed as a parameter in the 'clj' function. 65 | * E.g. if the expression is `clj('namespace/function')`, the parameter will 66 | * contain the value 'namespace/function'. This method creates a new instance of 67 | * JavaDelegate on the spot, with a body that invokes the referenced Clojure 68 | * function with its DelegateExecution parameter passed as an argument. 69 | */ 70 | public static JavaDelegate delegate(String expression) { 71 | return execution -> invokeClojureFunction(expression, execution); 72 | } 73 | 74 | public static Object function(String expression, Object... params) { 75 | return invokeClojureFunction(expression, params); 76 | } 77 | 78 | private static Object invokeClojureFunction(String expression, Object... params) { 79 | int paramSize = params.length; 80 | String[] expressionParts = expression.split(NS_SEPARATOR); 81 | String ns = expressionParts[0]; 82 | String name = expressionParts[1]; 83 | REQUIRE.invoke(Clojure.read(ns)); 84 | 85 | IFn fun = Clojure.var(ns, name); 86 | switch (paramSize) { 87 | case 0: 88 | return fun.invoke(); 89 | case 1: 90 | return fun.invoke(params[0]); 91 | case 2: 92 | return fun.invoke(params[0], params[1]); 93 | case 3: 94 | return fun.invoke(params[0], params[1], params[2]); 95 | case 4: 96 | return fun.invoke(params[0], params[1], params[2], params[3]); 97 | case 5: 98 | return fun.invoke(params[0], params[1], params[2], params[3], params[4]); 99 | case 6: 100 | return fun.invoke(params[0], params[1], params[2], params[3], params[4], params[5]); 101 | default: 102 | throw new IllegalArgumentException( 103 | String.format("Parameter size of %s is not allowed for a Clojure expression", paramSize)); 104 | } 105 | } 106 | 107 | } 108 | -------------------------------------------------------------------------------- /plugin/src/main/java/com/lambdaschmiede/camunda/clojure/ClojureProcessEnginePlugin.java: -------------------------------------------------------------------------------- 1 | package com.lambdaschmiede.camunda.clojure; 2 | 3 | import org.camunda.bpm.engine.ProcessEngine; 4 | import org.camunda.bpm.engine.impl.cfg.ProcessEngineConfigurationImpl; 5 | import org.camunda.bpm.engine.impl.cfg.ProcessEnginePlugin; 6 | 7 | /** 8 | * A ProcessEnginePlugin which adds a UEL function to use plain Clojure functions as Java Delegates via Delegate Expressions 9 | * 10 | */ 11 | public class ClojureProcessEnginePlugin implements ProcessEnginePlugin { 12 | 13 | public void preInit(ProcessEngineConfigurationImpl processEngineConfiguration) { 14 | // Nothing to do here 15 | } 16 | 17 | /** 18 | * Registers the ClojureFunctionMapper as an additional expression mapper in the Process Engine after it is initialized 19 | */ 20 | public void postInit(ProcessEngineConfigurationImpl processEngineConfiguration) { 21 | processEngineConfiguration.getExpressionManager().addFunctionMapper(new ClojureFunctionMapper()); 22 | } 23 | 24 | public void postProcessEngineBuild(ProcessEngine processEngine) { 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 4.0.0 6 | 7 | 8 | 7.15.0 9 | 11 10 | 11 11 | 12 | 13 | com.lambdaschmiede 14 | camunda-clojure-plugin-parent 15 | 1.2-SNAPSHOT 16 | 17 | pom 18 | 19 | 20 | plugin 21 | test 22 | 23 | 24 | 25 | 26 | 27 | org.camunda.bpm 28 | camunda-bom 29 | ${camunda.version} 30 | import 31 | pom 32 | 33 | 34 | 35 | 36 | 37 | -------------------------------------------------------------------------------- /test/delegate.clj: -------------------------------------------------------------------------------- 1 | (ns camunda-clojure-plugin.delegate) 2 | 3 | (defn test-delegate [execution] 4 | (let [{:strs [myvar]} (.getVariables execution)] 5 | (.setVariable execution "myvar" (- myvar 10)))) 6 | -------------------------------------------------------------------------------- /test/pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 4.0.0 6 | 7 | com.lambdaschmiede 8 | camunda-clojure-plugin-test 9 | 1.2-SNAPSHOT 10 | 11 | 12 | ../pom.xml 13 | com.lambdaschmiede 14 | camunda-clojure-plugin-parent 15 | 1.2-SNAPSHOT 16 | 17 | 18 | 19 | 11 20 | 11 21 | 22 | 23 | 24 | 25 | 26 | com.lambdaschmiede 27 | camunda-clojure-plugin 28 | 1.2-SNAPSHOT 29 | 30 | 31 | 32 | org.camunda.bpm 33 | camunda-engine 34 | test 35 | 36 | 37 | 38 | org.clojure 39 | clojure 40 | 1.10.3 41 | test 42 | 43 | 44 | 45 | junit 46 | junit 47 | 4.13.2 48 | test 49 | 50 | 51 | 52 | org.assertj 53 | assertj-core 54 | 3.18.1 55 | test 56 | 57 | 58 | 59 | org.camunda.bpm.assert 60 | camunda-bpm-assert 61 | 10.0.0 62 | test 63 | 64 | 65 | 66 | com.h2database 67 | h2 68 | 1.4.200 69 | test 70 | 71 | 72 | 73 | org.camunda.bpm.extension 74 | camunda-bpm-process-test-coverage 75 | 0.3.2 76 | test 77 | 78 | 79 | 80 | 81 | -------------------------------------------------------------------------------- /test/src/test/java/com/lambdaschmiede/camunda/clojure/ProcessEngineTest.java: -------------------------------------------------------------------------------- 1 | package com.lambdaschmiede.camunda.clojure; 2 | 3 | import clojure.java.api.Clojure; 4 | import clojure.lang.IFn; 5 | import org.camunda.bpm.engine.runtime.ProcessInstance; 6 | import org.camunda.bpm.engine.test.Deployment; 7 | import org.camunda.bpm.engine.test.ProcessEngineRule; 8 | import org.camunda.bpm.extension.process_test_coverage.junit.rules.TestCoverageProcessEngineRuleBuilder; 9 | import org.junit.Before; 10 | import org.junit.ClassRule; 11 | import org.junit.Rule; 12 | import org.junit.Test; 13 | import java.util.Map; 14 | 15 | import static org.camunda.bpm.engine.test.assertions.bpmn.BpmnAwareTests.*; 16 | 17 | 18 | public class ProcessEngineTest { 19 | 20 | @Rule 21 | @ClassRule 22 | public static ProcessEngineRule rule = TestCoverageProcessEngineRuleBuilder.create().build(); 23 | 24 | @Test 25 | @Deployment(resources = "test-process.bpmn") 26 | public void testPositiveValue() { 27 | IFn func = Clojure.var("clojure.core", "load-file"); 28 | func.invoke("delegate.clj"); 29 | ProcessInstance instance = runtimeService().startProcessInstanceByKey("Process_TestProcess", Map.of("myvar", 20L)); 30 | assertThat(instance).variables().hasSize(1); 31 | assertThat(instance).variables().containsEntry("myvar", 10L); 32 | assertThat(instance).hasPassed("Activity_Test_01").isEnded().hasPassed("Event_PositiveValue"); 33 | } 34 | 35 | @Test 36 | @Deployment(resources = "test-process.bpmn") 37 | public void testNegativeValue() { 38 | IFn func = Clojure.var("clojure.core", "load-file"); 39 | func.invoke("delegate.clj"); 40 | ProcessInstance instance = runtimeService().startProcessInstanceByKey("Process_TestProcess", Map.of("myvar", 5L)); 41 | assertThat(instance).variables().hasSize(1); 42 | assertThat(instance).variables().containsEntry("myvar", -5L); 43 | assertThat(instance).hasPassed("Activity_Test_01").isEnded().hasPassed("Event_NegativeValue"); 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /test/src/test/resources/camunda.cfg.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | -------------------------------------------------------------------------------- /test/src/test/resources/logback-test.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | -------------------------------------------------------------------------------- /test/src/test/resources/test-process.bpmn: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Flow_09o9z38 6 | 7 | 8 | 9 | Flow_041ey5f 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | Flow_09o9z38 19 | Flow_1l02w3e 20 | 21 | 22 | Flow_1l02w3e 23 | Flow_041ey5f 24 | Flow_0dsck12 25 | 26 | 27 | ${clj:function('clojure.core/pos?', myvar)} 28 | 29 | 30 | Flow_0dsck12 31 | 32 | 33 | ${not clj:function('clojure.core/pos?', myvar)} 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | --------------------------------------------------------------------------------