Added project for Apache pulsar examples

apache-pulsar/src/main/java/com/baeldung/ConsumerTest.java

@@ -0,0 +1,48 @@
+package com.baeldung;
+
+import java.io.IOException;
+
+import org.apache.pulsar.client.api.Consumer;
+import org.apache.pulsar.client.api.Message;
+import org.apache.pulsar.client.api.PulsarClient;
+import org.apache.pulsar.client.api.SubscriptionType;
+
+public class ConsumerTest {
+
+    private static final String SERVICE_URL = "pulsar://localhost:6650";
+    private static final String TOPIC_NAME = "test-topic";
+    private static final String SUBSCRIPTION_NAME = "test-subscription";
+
+    public static void main(String[] args) throws IOException {
+        // Create a Pulsar client instance. A single instance can be shared across many
+        // producers and consumer within the same application
+        PulsarClient client = PulsarClient.builder()
+                .serviceUrl(SERVICE_URL)
+                .build();
+
+        //Configure consumer specific settings.
+        Consumer<byte[]> consumer = client.newConsumer()
+                .topic(TOPIC_NAME)
+                // Allow multiple consumers to attach to the same subscription
+                // and get messages dispatched as a queue
+                .subscriptionType(SubscriptionType.Shared)
+                .subscriptionName(SUBSCRIPTION_NAME)
+                .subscribe();
+
+
+        // Once the consumer is created, it can be used for the entire application lifecycle
+        System.out.println("Created consumer for the topic "+ TOPIC_NAME);
+
+        do {
+            // Wait until a message is available
+            Message<byte[]> msg = consumer.receive();
+
+            // Extract the message as a printable string and then log
+            String content = new String(msg.getData());
+            System.out.println("Received message '"+content+"' with ID "+msg.getMessageId());
+
+            // Acknowledge processing of the message so that it can be deleted
+            consumer.acknowledge(msg);
+        } while (true);
+    }
+}