Expose sequenceId in message (apache#1026)

pulsar-client/src/main/java/org/apache/pulsar/client/api/Message.java

@@ -92,6 +92,24 @@ public interface Message {
      */
     long getEventTime();
 
+    /**
+     * Get the sequence id associated with this message. It is typically set by the applications via
+     * {@link MessageBuilder#setSequenceId(long)}.
+     *
+     * @return sequence id associated with this message.
+     * @see MessageBuilder#setEventTime(long)
+     * @since 1.22.0
+     */
+    long getSequenceId();
+
+    /**
+     * Get the producer name who produced this message.
+     *
+     * @return producer name who produced this message, null if producer name is not set.
+     * @since 1.22.0
+     */
+    String getProducerName();
+
     /**
      * Check whether the message has a key
      *

pulsar-client/src/main/java/org/apache/pulsar/client/impl/MessageImpl.java

@@ -187,6 +187,24 @@ public byte[] getData() {
         }
     }
 
+    @Override
+    public long getSequenceId() {
+        checkNotNull(msgMetadataBuilder);
+        if (msgMetadataBuilder.hasSequenceId()) {
+            return msgMetadataBuilder.getSequenceId();
+        }
+        return -1;
+    }
+
+    @Override
+    public String getProducerName() {
+        checkNotNull(msgMetadataBuilder);
+        if (msgMetadataBuilder.hasProducerName()) {
+            return msgMetadataBuilder.getProducerName();
+        }
+        return null;
+    }
+
     ByteBuf getDataBuffer() {
         return payload;
     }

pulsar-client/src/test/java/org/apache/pulsar/client/impl/MessageImplTest.java

@@ -0,0 +1,73 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.client.impl;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertNull;
+
+import java.nio.ByteBuffer;
+import org.apache.pulsar.common.api.proto.PulsarApi.MessageMetadata;
+import org.testng.annotations.Test;
+
+/**
+ * Unit test of {@link MessageImpl}.
+ */
+public class MessageImplTest {
+
+    @Test
+    public void testGetSequenceIdNotAssociated() {
+        MessageMetadata.Builder builder = MessageMetadata.newBuilder();
+        ByteBuffer payload = ByteBuffer.wrap(new byte[0]);
+        MessageImpl msg = MessageImpl.create(builder, payload);
+
+        assertEquals(-1, msg.getSequenceId());
+    }
+
+    @Test
+    public void testGetSequenceIdAssociated() {
+        MessageMetadata.Builder builder = MessageMetadata.newBuilder()
+            .setSequenceId(1234);
+
+        ByteBuffer payload = ByteBuffer.wrap(new byte[0]);
+        MessageImpl msg = MessageImpl.create(builder, payload);
+
+        assertEquals(1234, msg.getSequenceId());
+    }
+
+    @Test
+    public void testGetProducerNameNotAssigned() {
+        MessageMetadata.Builder builder = MessageMetadata.newBuilder();
+        ByteBuffer payload = ByteBuffer.wrap(new byte[0]);
+        MessageImpl msg = MessageImpl.create(builder, payload);
+
+        assertNull(msg.getProducerName());
+    }
+
+    @Test
+    public void testGetProducerNameAssigned() {
+        MessageMetadata.Builder builder = MessageMetadata.newBuilder()
+            .setProducerName("test-producer");
+
+        ByteBuffer payload = ByteBuffer.wrap(new byte[0]);
+        MessageImpl msg = MessageImpl.create(builder, payload);
+
+        assertEquals("test-producer", msg.getProducerName());
+    }
+
+}