diff --git a/src/index.ts b/src/index.ts
index cdc6f9b..5715432 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,9 +1 @@
 import {Configuration} from 'xdb-ts-api'
-//
-// console.log(new Configuration())
-
-export function add(a: number, b: number): number {
-    return a + b;
-}
-
-console.log(add(3, 5)); //output: 8
\ No newline at end of file
diff --git a/src/xdb/async-state.ts b/src/xdb/async-state.ts
new file mode 100644
index 0000000..71ad117
--- /dev/null
+++ b/src/xdb/async-state.ts
@@ -0,0 +1,42 @@
+import {RetryPolicy} from 'xdb-ts-api'
+import {Context} from "./context";
+import {Persistence} from "./persistence";
+import {Communication} from "./communication";
+import {StateDecision} from "./state-decision";
+import {CommandRequest} from "./command-request";
+
+export interface AsyncState<Input>{
+    stateOptions?:AsyncStateOptions
+    waitUntil?:WaitUntilMethod<Input>
+    execute(ctx:Context, input:Input, persistence:Persistence, communication :Communication):StateDecision
+}
+
+export interface WaitUntilMethod<Input>{
+    waitUntil(ctx:Context, input:Input, communication: Communication):CommandRequest
+}
+export interface AsyncStateOptions{
+    // waitUntilTimeoutSeconds is the timeout for the waitUntil API call.
+    // Default: 10 seconds(configurable in server) when set as 0
+    // It will be capped to 60 seconds by server (configurable in server)
+    waitUntilTimeoutSeconds?: number
+    // executeTimeoutSeconds is the timeout for the execute API call.
+    // Default: 10 seconds(configurable in server) when set as 0
+    // It will be capped to 60 seconds by server (configurable in server)
+    executeTimeoutSeconds?: number
+    // waitUntilRetryPolicy is the retry policy for the waitUntil API call.
+    // Default: infinite retry with 1 second initial interval, 120 seconds max interval, and 2 backoff factor,
+    // when set as nil
+    waitUntilRetryPolicy?:RetryPolicy
+    // executeRetryPolicy is the retry policy for the execute API call.
+    // Default: infinite retry with 1 second initial interval, 120 seconds max interval, and 2 backoff factor,
+    // when set as nil
+    executeRetryPolicy?:RetryPolicy
+    // failureRecoveryState is the state to recover after current state execution fails
+    // Default: no recovery when set as nil
+    failureRecoveryState?: AsyncState<any>
+    // persistencePolicyName is the name of loading policy for persistence if not using default policy
+    persistencePolicyName?:string
+    // stateId is the unique identifier of the state.
+    // It is being used for WorkerService to choose the right AsyncState to execute Start/Execute APIs
+    stateId?: string
+}
\ No newline at end of file
diff --git a/src/xdb/command-request.ts b/src/xdb/command-request.ts
new file mode 100644
index 0000000..cf1125d
--- /dev/null
+++ b/src/xdb/command-request.ts
@@ -0,0 +1,3 @@
+export interface CommandRequest{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/xdb/communication.ts b/src/xdb/communication.ts
new file mode 100644
index 0000000..cc23c14
--- /dev/null
+++ b/src/xdb/communication.ts
@@ -0,0 +1,4 @@
+
+export interface Communication{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/xdb/context.ts b/src/xdb/context.ts
new file mode 100644
index 0000000..c8ec08e
--- /dev/null
+++ b/src/xdb/context.ts
@@ -0,0 +1,4 @@
+
+export interface Context{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/xdb/persistence-schema.ts b/src/xdb/persistence-schema.ts
new file mode 100644
index 0000000..1c7b1bf
--- /dev/null
+++ b/src/xdb/persistence-schema.ts
@@ -0,0 +1,3 @@
+export interface PersistenceSchema{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/xdb/persistence.ts b/src/xdb/persistence.ts
new file mode 100644
index 0000000..f0117e7
--- /dev/null
+++ b/src/xdb/persistence.ts
@@ -0,0 +1,3 @@
+export interface Persistence{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/xdb/process.ts b/src/xdb/process.ts
new file mode 100644
index 0000000..51bb56f
--- /dev/null
+++ b/src/xdb/process.ts
@@ -0,0 +1,21 @@
+import {StateSchema} from "./state-schema";
+import {PersistenceSchema} from "./persistence-schema";
+import {ProcessIdReusePolicy} from "xdb-ts-api";
+
+export interface Process{
+    stateSchema?:StateSchema
+    persistenceSchema?:PersistenceSchema
+    processOptions?:ProcessOptions
+}
+
+export interface ProcessOptions{
+    // TimeoutSeconds is the timeout for the process execution.
+    // Default: 0, mean which means infinite timeout
+    timeoutSeconds?:number
+    // IdReusePolicy is the policy for reusing process id.
+    // Default: xdbapi.ALLOW_IF_NO_RUNNING when set as nil
+    idReusePolicy?:ProcessIdReusePolicy
+    // processType defines the processType of this process definition.
+    // GetFinalProcessType set the default value when return empty string
+    processType?:string
+}
\ No newline at end of file
diff --git a/src/xdb/state-decision.ts b/src/xdb/state-decision.ts
new file mode 100644
index 0000000..a240aa9
--- /dev/null
+++ b/src/xdb/state-decision.ts
@@ -0,0 +1,3 @@
+export interface StateDecision{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/xdb/state-schema.ts b/src/xdb/state-schema.ts
new file mode 100644
index 0000000..a8d86dd
--- /dev/null
+++ b/src/xdb/state-schema.ts
@@ -0,0 +1,3 @@
+export interface StateSchema{
+    // TODO
+}
\ No newline at end of file
diff --git a/tests/add.test.ts b/tests/add.test.ts
index 6c060c3..d6b819e 100644
--- a/tests/add.test.ts
+++ b/tests/add.test.ts
@@ -1,6 +1,3 @@
-import { add } from '../src';
-
-test('adds two numbers correctly', () => {
-  const result = add(2, 3);
-  expect(result).toBe(5);
+test('TODO', () => {
+  console.log("hello world")
 });