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Added AgenticServices helper #835
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ricardozanini
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serverlessworkflow:main
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treblereel:agentic_helper
Oct 8, 2025
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134 changes: 134 additions & 0 deletions
134
...al/fluent/agentic/src/main/java/io/serverlessworkflow/fluent/agentic/AgenticWorkflow.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| /* | ||
| * Copyright 2020-Present The Serverless Workflow Specification Authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License 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 io.serverlessworkflow.fluent.agentic; | ||
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| import dev.langchain4j.agentic.Agent; | ||
| import dev.langchain4j.agentic.scope.AgenticScope; | ||
| import dev.langchain4j.service.V; | ||
| import io.serverlessworkflow.api.types.Workflow; | ||
| import io.serverlessworkflow.impl.WorkflowApplication; | ||
| import io.serverlessworkflow.impl.WorkflowModel; | ||
| import java.lang.annotation.Annotation; | ||
| import java.lang.reflect.InvocationHandler; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Proxy; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
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| public class AgenticWorkflow<T> { | ||
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| private final Class<T> agent; | ||
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| private AgentWorkflowBuilder builder; | ||
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| private AgenticWorkflow(Class<T> agent) { | ||
| this.agent = agent; | ||
| } | ||
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| public static <T> AgenticWorkflow<T> of(Class<T> agent) { | ||
| return new AgenticWorkflow<>(agent); | ||
| } | ||
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| public AgenticWorkflow<T> flow(AgentWorkflowBuilder builder) { | ||
| this.builder = builder; | ||
| return this; | ||
| } | ||
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| public T build() { | ||
| Objects.requireNonNull( | ||
| builder, "AgenticServices.flow(AgentWorkflowBuilder) must be called before build()"); | ||
| Workflow workflow = builder.build(); | ||
| return AgenticServiceBuilder.create(agent, new AgentInvocationHandler(workflow)); | ||
| } | ||
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| private static class AgenticServiceBuilder { | ||
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| @SuppressWarnings("unchecked") | ||
| public static <T> T create(Class<T> runner, InvocationHandler h) { | ||
| if (!runner.isInterface()) { | ||
| throw new IllegalArgumentException(runner + " must be an interface to create a Proxy"); | ||
| } | ||
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| ClassLoader cl = runner.getClassLoader(); | ||
| Class<?>[] ifaces = new Class<?>[] {runner}; | ||
| return (T) Proxy.newProxyInstance(cl, ifaces, h); | ||
| } | ||
| } | ||
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| private class AgentInvocationHandler implements InvocationHandler { | ||
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| private final Workflow workflow; | ||
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| public AgentInvocationHandler(Workflow workflow) { | ||
| this.workflow = workflow; | ||
| } | ||
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| @Override | ||
| public Object invoke(Object proxy, Method method, Object[] args) { | ||
| if (method.getDeclaringClass() == Object.class) { | ||
| return switch (method.getName()) { | ||
| case "toString" -> "AgentProxy(" + workflow.getDocument().getName() + ")"; | ||
| case "hashCode" -> System.identityHashCode(proxy); | ||
| case "equals" -> proxy == args[0]; | ||
| default -> throw new IllegalStateException("Unexpected Object method: " + method); | ||
| }; | ||
| } | ||
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| Agent agent = method.getAnnotation(Agent.class); | ||
| if (agent == null) { | ||
| throw new IllegalStateException( | ||
| "Method " + method.getName() + " is not annotated with @Agent"); | ||
| } | ||
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| Annotation[][] annotations = method.getParameterAnnotations(); | ||
| Map<String, Object> input = new HashMap<>(); | ||
| for (int i = 0; i < annotations.length; i++) { | ||
| boolean found = false; | ||
| for (Annotation a : annotations[i]) { | ||
| if (a instanceof V) { | ||
| String key = ((V) a).value(); | ||
| Object value = args[i]; | ||
| input.put(key, value); | ||
| found = true; | ||
| break; | ||
| } | ||
| } | ||
| if (!found) { | ||
| throw new IllegalStateException( | ||
| "Parameter " | ||
| + (i + 1) | ||
| + " of method " | ||
| + method.getName() | ||
| + " is not annotated with @V"); | ||
| } | ||
| } | ||
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| try (WorkflowApplication app = WorkflowApplication.builder().build()) { | ||
| WorkflowModel result = app.workflowDefinition(workflow).instance(input).start().get(); | ||
| if (result.asJavaObject() instanceof AgenticScope scope) { | ||
| Object out = scope.state().get("input"); | ||
| if (out != null) { | ||
| return out; | ||
| } | ||
| } | ||
| return result.asJavaObject(); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException("Workflow execution failed", e); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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This DSL is looking pretty cool. We should do the same for
FuncWorkflowBuilder, which is the one we are using onquarkus-flownext.