Java使用pulsar-flink-connector读取pulsar catalog元数据代码剖析

简介

通过 pulsar-flink-connector 读取到 apache pulsar 中的namespaces、topics的元数据信息。
pulsar-flink-connector 的 github：

maven

 <dependency>
   <groupid>io.streamnative.connectors</groupid>
   <artifactid>pulsar-flink-connector-2.11-1.12</artifactid>
   <version>2.7.3</version>
 </dependency>

   <!-- jar repositories -->
   <repositories>
        <repository>
            <id>central</id>
            <layout>default</layout>
            <url>https://repo1.maven.org/maven2</url>
        </repository>
        <repository>
            <id>bintray-streamnative-maven</id>
            <name>bintray</name>
            <url>https://dl.bintray.com/streamnative/maven</url>
        </repository>
    </repositories>

code

使用pulsarmetadatareader获取元数据

package com.levi.demo;

import org.apache.flink.streaming.connectors.pulsar.internal.pulsarmetadatareader;
import org.apache.pulsar.client.admin.pulsaradminexception;
import org.apache.pulsar.client.impl.auth.authenticationtoken;
import org.apache.pulsar.client.impl.conf.clientconfigurationdata;
import org.apache.pulsar.common.schema.schemainfo;
import org.apache.pulsar.common.schema.schematype;

import java.io.ioexception;
import java.util.hashmap;
import java.util.list;
import java.util.map;

/**
 * test.
 *
 * @author levi
 * @version 1.0
 **/
public class test {

    public static void main(string[] args)  {
        final clientconfigurationdata configurationdata = new clientconfigurationdata();
        configurationdata.setserviceurl("pulsar://127.0.0.1:6650");
        //your pulsar token
        final authenticationtoken token =
                new authenticationtoken(
                        "eyjxxxxxxxxxxx.eyxxxxxxxxxxxxx.xxxxxxxxxxx"); 
        configurationdata.setauthentication(token);
 
        try (final pulsarmetadatareader reader =
                     new pulsarmetadatareader("http://127.0.0.1:8443",
                             configurationdata,
                             "",
                             new hashmap(),
                             -1,
                             -1)) {
            //获取namespaces
            final list<string> namespaces = reader.listnamespaces();
            system.out.println("namespaces: " + namespaces.tostring());
            
            for (final string namespace : namespaces) {
                //获取topics
                final list<string> topics = reader.gettopics(namespace);
                system.out.println("topic: " + topics.tostring());
                
                for (string topic : topics) {
                    //获取字段schemainfo
                    final schemainfo schemainfo = reader.getpulsarschema(topic);
                    final string name = schemainfo.getname();
                    system.out.println("schemaname:" + name); //topicname
                    final schematype type = schemainfo.gettype(); 
                    system.out.println("schematype:" + type.tostring());// "json"...
                    final map<string, string> properties = schemainfo.getproperties();
                    system.out.println(properties); 
                    final string schemadefinition = schemainfo.getschemadefinition();
                    system.out.println(schemadefinition); // field info.
                }
            }

        } catch (ioexception | pulsaradminexception e) {
            e.printstacktrace();
        }


    }


}

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