Integrated WorkflowData and made the request async

Signed-off-by: Owais Kazi <owaiskazi19@gmail.com>

build.gradle

@@ -105,7 +105,6 @@ repositories {
 dependencies {
     implementation "org.opensearch:opensearch:${opensearch_version}"
     implementation 'org.junit.jupiter:junit-jupiter:5.10.0'
-    implementation "org.apache.logging.log4j:log4j-slf4j-impl:2.19.0"
     compileOnly "com.google.guava:guava:32.1.2-jre"
     api group: 'org.opensearch', name:'opensearch-ml-client', version: "${opensearch_build}"
 

src/main/java/org/opensearch/flowframework/FlowFrameworkPlugin.java

@@ -16,7 +16,7 @@
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.env.Environment;
 import org.opensearch.env.NodeEnvironment;
-import org.opensearch.flowframework.workflow.CreateIndexStep;
+import org.opensearch.flowframework.workflow.CreateIndex.CreateIndexStep;
 import org.opensearch.plugins.Plugin;
 import org.opensearch.repositories.RepositoriesService;
 import org.opensearch.script.ScriptService;

src/main/java/org/opensearch/flowframework/workflow/CreateIndex/CreateIndexResponseData.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+package org.opensearch.flowframework.workflow.CreateIndex;
+
+import org.opensearch.flowframework.workflow.WorkflowData;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class CreateIndexResponseData implements WorkflowData {
+
+    private Map<String, Object> content = new HashMap<>();
+
+    public CreateIndexResponseData(String index) {
+        // store index name after successfully creating index in content
+        content.put("index", index);
+    }
+
+    @Override
+    public Map<String, Object> getContent() {
+        return Map.copyOf(content);
+    }
+
+}

src/main/java/org/opensearch/flowframework/workflow/CreateIndexStep.java → src/main/java/org/opensearch/flowframework/workflow/CreateIndex/CreateIndexStep.java

@@ -6,7 +6,7 @@
  * this file be licensed under the Apache-2.0 license or a
  * compatible open source license.
  */
-package org.opensearch.flowframework.workflow;
+package org.opensearch.flowframework.workflow.CreateIndex;
 
 import com.google.common.base.Charsets;
 import com.google.common.io.Resources;
@@ -17,9 +17,13 @@
 import org.opensearch.action.admin.indices.create.CreateIndexResponse;
 import org.opensearch.client.Client;
 import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.flowframework.workflow.WorkflowData;
+import org.opensearch.flowframework.workflow.WorkflowStep;
 
 import java.io.IOException;
 import java.net.URL;
+import java.util.List;
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 
 public class CreateIndexStep implements WorkflowStep {
@@ -33,26 +37,39 @@ public CreateIndexStep(Client client) {
     }
 
     @Override
-    public CompletableFuture<WorkflowData> execute(WorkflowData data) {
-
+    public CompletableFuture<WorkflowData> execute(List<WorkflowData> data) {
+        CompletableFuture<WorkflowData> future = new CompletableFuture<>();
         ActionListener<CreateIndexResponse> actionListener = new ActionListener<>() {
 
             @Override
             public void onResponse(CreateIndexResponse createIndexResponse) {
                 logger.info("created index:{}");
+                CreateIndexResponseData createIndexResponseData = new CreateIndexResponseData(createIndexResponse.index());
+                future.complete(createIndexResponseData);
             }
 
             @Override
             public void onFailure(Exception e) {
                 logger.error("Index creation failed", e);
+                future.completeExceptionally(e);
             }
         };
 
-        // Fetch indexName, fileName and settings from WorkflowData
-        CreateIndexRequest request = new CreateIndexRequest(indexName).mapping(getIndexMappings(fileName), XContentType.JSON)
+        String index = null;
+
+        for (WorkflowData workflowData : data) {
+            // Fetch index from content i.e. request body of execute API
+            Map<String, Object> content = workflowData.getContent();
+            index = (String) content.get("index");
+        }
+
+        // TODO:
+        // 1. Map index type -> fileName
+        // 2. Create settings based on the index settings received from content
+        CreateIndexRequest request = new CreateIndexRequest(index).mapping(getIndexMappings(fileName), XContentType.JSON)
             .settings(settings);
         client.admin().indices().create(request, actionListener);
-        return null;
+        return future;
     }
 
     @Override

src/main/java/org/opensearch/flowframework/workflow/WorkflowData.java

@@ -8,7 +8,33 @@
  */
 package org.opensearch.flowframework.workflow;
 
+import java.util.Collections;
+import java.util.Map;
+
 /**
- * Interface for handling the input/output of the building blocks.
+ * Interface representing data provided as input to, and produced as output from, {@link WorkflowStep}s.
  */
-public interface WorkflowData {}
+public interface WorkflowData {
+
+    /**
+     * An object representing no data, useful when a workflow step has no required input or output.
+     */
+    WorkflowData EMPTY = new WorkflowData() {
+    };
+
+    /**
+     * Accesses a map containing the content of the workflow step. This represents the data associated with a Rest API request.
+     * @return the content of this step.
+     */
+    default Map<String, Object> getContent() {
+        return Collections.emptyMap();
+    };
+
+    /**
+     * Accesses a map containing the params of this workflow step. This represents the params associated with a Rest API request, parsed from the URI.
+     * @return the params of this step.
+     */
+    default Map<String, String> getParams() {
+        return Collections.emptyMap();
+    };
+}

src/main/java/org/opensearch/flowframework/workflow/WorkflowStep.java

@@ -8,8 +8,7 @@
  */
 package org.opensearch.flowframework.workflow;
 
-import org.opensearch.common.Nullable;
-
+import java.util.List;
 import java.util.concurrent.CompletableFuture;
 
 /**
@@ -22,7 +21,7 @@ public interface WorkflowStep {
      * @param data for input/output params of the building blocks.
      * @return CompletableFuture of the building block.
      */
-    CompletableFuture<WorkflowData> execute(@Nullable WorkflowData data);
+    CompletableFuture<WorkflowData> execute(List<WorkflowData> data);
 
     /**
      *