Improvements on HttpExecutor (#912)

Signed-off-by: fjtirado <ftirados@redhat.com>

Author: fjtirado

impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/ExpressionURISupplier.java

@@ -197,4 +197,17 @@ public static TargetSupplier getURISupplier(UriTemplate template) {
     }
     throw new IllegalArgumentException("Invalid uritemplate definition " + template);
   }
+
+  private static class ExpressionURISupplier implements TargetSupplier {
+    private WorkflowValueResolver<String> expr;
+
+    public ExpressionURISupplier(WorkflowValueResolver<String> expr) {
+      this.expr = expr;
+    }
+
+    @Override
+    public WebTarget apply(WorkflowContext workflow, TaskContext task, WorkflowModel node) {
+      return client.target(expr.apply(workflow, task, node));
+    }
+  }
 }

impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/HttpExecutor.java

@@ -27,20 +27,17 @@
 
 class OperationDefinitionSupplier {
 
-  private final WorkflowApplication application;
-  private final OpenAPIArguments with;
+  private final String operationId;
+  private final TargetSupplier targetSupplier;
 
   OperationDefinitionSupplier(WorkflowApplication application, OpenAPIArguments with) {
-    this.with = with;
-    this.application = application;
+    this.operationId = with.getOperationId();
+    this.targetSupplier =
+        getTargetSupplier(with.getDocument().getEndpoint(), application.expressionFactory());
   }
 
   OperationDefinition get(
       WorkflowContext workflowContext, TaskContext taskContext, WorkflowModel input) {
-    TargetSupplier targetSupplier =
-        getTargetSupplier(with.getDocument().getEndpoint(), application.expressionFactory());
-
-    String operationId = with.getOperationId();
     WebTarget webTarget = targetSupplier.apply(workflowContext, taskContext, input);
     OpenAPIProcessor processor = new OpenAPIProcessor(operationId, webTarget.getUri());
     return processor.parse();