Bagikan melalui

Menerbitkan peristiwa ke topik namespace menggunakan Java

  • Artikel

Artikel ini menyediakan panduan langkah demi langkah cepat untuk menerbitkan CloudEvents menggunakan Java. Kode sampel dalam artikel ini menggunakan format CloudEvents JSON saat mengirim peristiwa.

Prasyarat

Prasyarat yang perlu Anda miliki sebelum melanjutkan adalah:

  • Namespace, topik, dan langganan peristiwa.

  • Paket SDK beta terbaru. Jika Anda menggunakan maven, Anda dapat berkonsultasi dengan repositori pusat maven.

    Penting

    Dukungan SDK sarana data pengiriman pull tersedia dalam paket beta. Anda harus menggunakan paket beta terbaru dalam proyek Anda.

  • IDE yang mendukung Java seperti IntelliJ IDEA, Eclipse IDE, atau Visual Studio Code.

  • Java JRE menjalankan tingkat bahasa Java 8.

Menerbitkan peristiwa ke topik namespace layanan

Gunakan kelas berikut untuk memahami langkah-langkah dasar untuk menerbitkan peristiwa.

package com.azure.messaging.eventgrid.samples;

import com.azure.core.credential.AzureKeyCredential;
import com.azure.core.http.HttpClient;
import com.azure.core.models.CloudEvent;
import com.azure.core.models.CloudEventDataFormat;
import com.azure.core.util.BinaryData;
import com.azure.messaging.eventgrid.EventGridClient;
import com.azure.messaging.eventgrid.EventGridClientBuilder;
import com.azure.messaging.eventgrid.EventGridMessagingServiceVersion;

import java.time.OffsetDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Random;

/**
 * <p>Simple demo publisher of CloudEvents to Event Grid namespace topics.
 *
 * This code samples should use Java 1.8 level or above to avoid compilation errors.
 *
 * You should consult the resources below to use the client SDK and set up your project using maven.
 * @see <a href="https://github.com/Azure/azure-sdk-for-java/tree/main/sdk/eventgrid/azure-messaging-eventgrid">Event Grid data plane client SDK documentation</a>
 * @see <a href="https://github.com/Azure/azure-sdk-for-java/blob/main/sdk/boms/azure-sdk-bom/README.md">Azure BOM for client libraries</a>
 * @see <a href="https://aka.ms/spring/versions">Spring Version Mapping</a> if you are using Spring.
 * @see <a href="https://aka.ms/azsdk">Tool with links to control plane and data plane SDKs across all languages supported</a>.
 *</p>
 */
public class NamespaceTopicPublisher {
    private static final String TOPIC_NAME = "<yourNamespaceTopicName>";
    public static final String ENDPOINT =  "<yourFullHttpsUrlToTheNamespaceEndpoint>";
    public static final int NUMBER_OF_EVENTS_TO_BUILD_THAT_DOES_NOT_EXCEED_100 = 10;

    //TODO  Do NOT include keys in source code. This code's objective is to give you a succinct sample about using Event Grid, not to provide an authoritative example for handling secrets in applications.
    /**
    *  For security concerns, you should not have keys or any other secret in any part of the application code.
     *  You should use services like Azure Key Vault for managing your keys.
     */
    public static final AzureKeyCredential CREDENTIAL = new AzureKeyCredential("<namespace key>");

    public static void main(String[] args) {
        //TODO Update Event Grid version number to your desired version. You can find more information on data plane APIs here:
        //https://learn.microsoft.com/en-us/rest/api/eventgrid/.
        EventGridClient eventGridClient = new EventGridClientBuilder()
                .httpClient(HttpClient.createDefault())  // Requires Java 1.8 level
                .endpoint(ENDPOINT)
                .serviceVersion(EventGridMessagingServiceVersion.V2023_06_01_PREVIEW)
                .credential(CREDENTIAL).buildClient();   // you may want to use .buildAsyncClient() for an asynchronous (project reactor) client.

        List<CloudEvent> cloudEvents = buildCloudEvents(NUMBER_OF_EVENTS_TO_BUILD_THAT_DOES_NOT_EXCEED_100);

        eventGridClient.publishCloudEvents(TOPIC_NAME, cloudEvents);

        System.out.println("--> Number of events published: " + NUMBER_OF_EVENTS_TO_BUILD_THAT_DOES_NOT_EXCEED_100); // There is no partial publish. Either all succeed or none.
    }

    /**
     * <p>Builds a list of valid CloudEvents for testing purposes</p>
     * @param numberOfEventsToBuild this should not exceed 100, which is the maximum number of events allowed in a single HTTP request or 1MB in size, whichever is met first.
     * @return the list of CloudEvents
     */
    private static List<CloudEvent> buildCloudEvents(int numberOfEventsToBuild) {
        List<CloudEvent> cloudEvents = new ArrayList<>(numberOfEventsToBuild);
        while (numberOfEventsToBuild >= 1) {
            cloudEvents.add(buildCloudEvent());
            numberOfEventsToBuild--;
        }
        return cloudEvents;
    }

    /**
     * <p>Builds a valid CloudEvent for testing purposes.</p>
     * @return a CloudEvent
     */
    private static CloudEvent buildCloudEvent() {
        String orderId = Integer.toString(new Random().nextInt(1000-10+1) + 10);  // Generates a random integer between 1000 and 1 (exclusive)

        return new CloudEvent("/account/a-4305/orders", "com.MyCompanyName.OrderCreated",
                BinaryData.fromObject(new HashMap<String, String>() {
                    {
                        put("orderId", orderId);
                        put("orderResourceURL", "https://www.MyCompanyName.com/orders/" + orderId);
                        put("isRushOrder", "true");
                        put("customerType", "Institutional");
                    }
                }), CloudEventDataFormat.JSON, "application/json")
                .setTime(OffsetDateTime.now());
    }
}

Langkah berikutnya