How to use the Apache Avro IPC framework in the Java class library
Apache Avro IPC is a scalable framework that is used to achieve remote process calls (RPC) and message transmission.It provides a general binary data serialization system to define data types and protocols and support communication across different languages.
The use of Apache Avro IPC is as follows:
1. Add Maven dependence: Add the following dependencies to the pom.xml file of the project:
<dependencies>
<dependency>
<groupId>org.apache.avro</groupId>
<artifactId>avro</artifactId>
<version>1.10.2</version>
</dependency>
</dependencies>
2. Create the AVRO protocol and data type definition: Use AVRO IDL (interface definition language) to write a .avdl file to define the protocol and data type you want to use.For example, create a file called "Example.avdl", which contains the following:
idl
@namespace("com.example")
protocol example {
record Person {
string name;
int age;
}
string greet(Person person);
}
3. Generate Java class: Use AVRO tools to generate java files.Open the command line terminal and run the following command:
$ java -jar avro-tools-1.10.2.jar idl example.avdl .
This will generate a Java class named "Example.java".
4. Implement the server: Create a server program that implements the AVRO protocol.For example, create a file called "Server.java", which contains the following:
import org.apache.avro.ipc.*;
import org.apache.avro.ipc.specific.*;
import com.example.*;
public class Server implements example {
@Override
public String greet(Person person) {
return "Hello, " + person.getName() + "! You are " + person.getAge() + " years old.";
}
public static void main(String[] args) throws Exception {
Server server = new Server();
Server serverImpl = new SpecificResponder(example.class, server);
NettyServer avroServer = new NettyServer(serverImpl, new InetSocketAddress(9090));
avroServer.start();
avroServer.join();
}
}
5. Implement client: Create a client program that implements the AVRO protocol.For example, create a file called "Client.java", which contains the following:
import org.apache.avro.ipc.*;
import org.apache.avro.ipc.specific.*;
import com.example.*;
public class Client {
public static void main(String[] args) throws Exception {
NettyTransceiver client = new NettyTransceiver(new InetSocketAddress("localhost", 9090));
example proxy = SpecificRequestor.getClient(example.class, client);
Person person = new Person();
person.setName("John");
person.setAge(30);
String greeting = proxy.greet(person);
System.out.println(greeting);
client.close();
}
}
6. Compilation and operation: Use the following commands to compile and run the server and client program:
$ javac Server.java
$ java Server
$ javac Client.java
$ java Client
The server will start to listen to the title 9090 and wait for the client to connect.The client will connect to the server and send a Person object to the Greet method on the service side for processing.The server returns a greeting, and the client will print out this greeting.
In this way, you use Apache Avro IPC to complete a simple remote process call example!
Please note that in order to run the example, you need to download the AVRO-Tools-1.10.2.jar and put it in the same directory as the Java source file.You also need to ensure the correct configuration of the Java environment.
