mirror of https://github.com/dapr/docs.git
Modified based on the review comments - 2
Signed-off-by: Amulya Varote <amulyavarote@MININT-8V4CL0S.redmond.corp.microsoft.com>
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@ -13,13 +13,13 @@ For a complete sample showing output bindings, visit this [link](https://github.
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The below code example loosely describes an application that processes orders. In the example, there is an order processing service which has a Dapr sidecar. The order processing service uses Dapr to invoke external resources via an output binding.
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<img src="/images/building-block-bindings-example.png" width=1000 alt="Diagram showing bindings of example service">
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<img src="/images/building-block-output-binding-example.png" width=1000 alt="Diagram showing bindings of example service">
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## 1. Create a binding
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An output binding represents a resource that Dapr uses to invoke and send messages to.
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For the purpose of this guide, you'll use a Kafka binding. You can find a list of the different binding specs [here]({{< ref setup-bindings >}}).
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For the purpose of this guide, you'll use a Kafka binding. You can find a list of all supported binding components [here]({{< ref setup-bindings >}}).
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Create a new binding component with the name of `checkout`.
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@ -101,7 +101,14 @@ Below are code examples that leverage Dapr SDKs for output binding.
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```csharp
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//dependencies
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using System;
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using System.Collections.Generic;
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using System.Net.Http;
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using System.Net.Http.Headers;
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using System.Threading.Tasks;
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using Dapr.Client;
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using Microsoft.AspNetCore.Mvc;
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using System.Threading;
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//code
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namespace EventService
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@ -110,13 +117,17 @@ namespace EventService
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{
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static async Task Main(string[] args)
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{
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string BINDING_NAME = "checkout";
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string BINDING_OPERATION = "create";
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int orderId = 100;
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using var client = new DaprClientBuilder().Build();
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//Using Dapr SDK to invoke output binding
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await client.InvokeBindingAsync(BINDING_NAME, BINDING_OPERATION, orderId);
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Console.WriteLine("Sending message: " + orderId);
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string BINDING_NAME = "checkout";
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string BINDING_OPERATION = "create";
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while(true) {
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System.Threading.Thread.Sleep(5000);
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Random random = new Random();
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int orderId = random.Next(1,1000);
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using var client = new DaprClientBuilder().Build();
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//Using Dapr SDK to invoke output binding
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await client.InvokeBindingAsync(BINDING_NAME, BINDING_OPERATION, orderId);
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Console.WriteLine("Sending message: " + orderId);
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}
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}
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}
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}
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@ -138,19 +149,30 @@ dapr run --app-id orderprocessing --app-port 6001 --dapr-http-port 3601 --dapr-g
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import io.dapr.client.DaprClient;
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import io.dapr.client.DaprClientBuilder;
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import io.dapr.client.domain.HttpExtension;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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//code
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@SpringBootApplication
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public class OrderProcessingServiceApplication {
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private static final Logger log = LoggerFactory.getLogger(OrderProcessingServiceApplication.class);
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public static void main(String[] args) throws InterruptedException{
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String BINDING_NAME = "checkout";
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String BINDING_OPERATION = "create";
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int orderId = 100;
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DaprClient client = new DaprClientBuilder().build();
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//Using Dapr SDK to invoke output binding
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client.invokeBinding(BINDING_NAME, BINDING_OPERATION, orderId).block();
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log.info("Sending message: " + orderId);
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while(true) {
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TimeUnit.MILLISECONDS.sleep(5000);
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Random random = new Random();
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int orderId = random.nextInt(1000-1) + 1;
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DaprClient client = new DaprClientBuilder().build();
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//Using Dapr SDK to invoke output binding
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client.invokeBinding(BINDING_NAME, BINDING_OPERATION, orderId).block();
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log.info("Sending message: " + orderId);
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}
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}
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}
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@ -168,18 +190,25 @@ dapr run --app-id orderprocessing --app-port 6001 --dapr-http-port 3601 --dapr-g
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```python
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#dependencies
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import random
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from time import sleep
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import requests
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import logging
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import json
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from dapr.clients import DaprClient
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#code
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logging.basicConfig(level = logging.INFO)
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BINDING_NAME = 'checkout'
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BINDING_OPERATION = 'create'
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orderId = 100
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with DaprClient() as client:
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#Using Dapr SDK to invoke output binding
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resp = client.invoke_binding(BINDING_NAME, BINDING_OPERATION, json.dumps(orderId))
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logging.basicConfig(level = logging.INFO)
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logging.info('Sending message: ' + str(orderId))
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while True:
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sleep(random.randrange(50, 5000) / 1000)
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orderId = random.randint(1, 1000)
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with DaprClient() as client:
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#Using Dapr SDK to invoke output binding
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resp = client.invoke_binding(BINDING_NAME, BINDING_OPERATION, json.dumps(orderId))
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logging.basicConfig(level = logging.INFO)
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logging.info('Sending message: ' + str(orderId))
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```
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@ -197,6 +226,9 @@ dapr run --app-id orderprocessing --app-port 6001 --dapr-http-port 3601 --app-pr
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//dependencies
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import (
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"context"
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"log"
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"math/rand"
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"time"
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"strconv"
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dapr "github.com/dapr/go-sdk/client"
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@ -206,17 +238,20 @@ import (
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func main() {
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BINDING_NAME := "checkout";
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BINDING_OPERATION := "create";
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orderId := 100
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client, err := dapr.NewClient()
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if err != nil {
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panic(err)
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}
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defer client.Close()
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ctx := context.Background()
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//Using Dapr SDK to invoke output binding
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in := &dapr.InvokeBindingRequest{ Name: BINDING_NAME, Operation: BINDING_OPERATION , Data: []byte(strconv.Itoa(orderId))}
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err = client.InvokeOutputBinding(ctx, in)
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log.Println("Sending message: " + strconv.Itoa(orderId))
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for i := 0; i < 10; i++ {
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time.Sleep(5000)
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orderId := rand.Intn(1000-1) + 1
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client, err := dapr.NewClient()
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if err != nil {
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panic(err)
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}
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defer client.Close()
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ctx := context.Background()
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//Using Dapr SDK to invoke output binding
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in := &dapr.InvokeBindingRequest{ Name: BINDING_NAME, Operation: BINDING_OPERATION , Data: []byte(strconv.Itoa(orderId))}
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err = client.InvokeOutputBinding(ctx, in)
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log.Println("Sending message: " + strconv.Itoa(orderId))
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}
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}
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```
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@ -233,17 +268,21 @@ dapr run --app-id orderprocessing --app-port 6001 --dapr-http-port 3601 --dapr-g
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```javascript
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//dependencies
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import { DaprServer, DaprClient, CommunicationProtocolEnum } from 'dapr-client';
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//code
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const daprHost = "127.0.0.1";
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var main = function() {
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var orderId = 100;
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start(orderId).catch((e) => {
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console.error(e);
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process.exit(1);
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});
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for(var i=0;i<10;i++) {
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sleep(5000);
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var orderId = Math.floor(Math.random() * (1000 - 1) + 1);
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start(orderId).catch((e) => {
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console.error(e);
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process.exit(1);
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});
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}
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}
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async function start(orderId) {
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console.log("Sending message: " + orderId);
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}
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function sleep(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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main();
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```
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@ -22,7 +22,7 @@ For more info on bindings, read [this overview]({{<ref bindings-overview.md>}}).
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The below code example loosely describes an application that processes orders. In the example, there is an order processing service which has a Dapr sidecar. The checkout service uses Dapr to trigger the application via an input binding.
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<img src="/images/building-block-bindings-example.png" width=1000 alt="Diagram showing bindings of example service">
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<img src="/images/building-block-input-binding-example.png" width=1000 alt="Diagram showing bindings of example service">
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## 1. Create a binding
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@ -146,12 +146,16 @@ dapr run --app-id checkout --app-port 6002 --dapr-http-port 3602 --dapr-grpc-por
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```java
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//dependencies
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import org.springframework.web.bind.annotation.*;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import reactor.core.publisher.Mono;
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//code
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@RestController
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@RequestMapping("/")
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public class CheckoutServiceController {
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private static final Logger log = LoggerFactory.getLogger(CheckoutServiceController.class);
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@PostMapping(path = "/checkout")
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public Mono<String> getCheckout(@RequestBody(required = false) byte[] body) {
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return Mono.fromRunnable(() ->
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```python
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#dependencies
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import logging
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from dapr.ext.grpc import App, BindingRequest
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#code
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//dependencies
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import (
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"encoding/json"
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"log"
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"net/http"
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"github.com/gorilla/mux"
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)
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{{% codetab %}}
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```javascript
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//dependencies
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//dependencies
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import { DaprServer, CommunicationProtocolEnum } from 'dapr-client';
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//code
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