This article suggests that

Java SDK Call of all interfaces , Both support asynchronous invocation mode .

In addition to data scanning related interfaces , There is a separate asynchronous invocation mode , The asynchronous calling mode of other interfaces is the same .

The difference from synchronous calls is , Synchronous calls use Client Of poll Method invocation , Asynchronous calls use Client Of post Method invocation .

preparation

See Chapter ： preparation .

Sample code

This paper takes asynchronous data reading as an example , This paper introduces the asynchronous calling process of non data scanning interface .

Sample code

import com.tencent.tcaplus.client.Client;
import com.tencent.tcaplus.client.ClientFactory;
import com.tencent.tcaplus.client.Record;
import com.tencent.tcaplus.client.Request;
import com.tencent.tcaplus.client.Response;
import com.tencent.tdr.tcaplus_protocol_cs.TcaplusProtocolCsConstants;
​
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
​
public class Example {
​
    public static void main(String[] arguments) throws InterruptedException {
        // 1.  Prepare environmental information 
        // 1.1.  Directory service address list 
        List<String> dirList = new ArrayList<String>();
        dirList.add("tcp://x.x.x.x:9999");
        dirList.add("tcp://y.y.y.y:9999");
        // 1.2.  Business ID
        int appId = 1;
        // 1.3.  Business password 
        String appPassword = "****************";
        // 1.4.  Table group ID
        int tableGroupId = 1;
        // 1.5.  Table name 
        String tableName = "test";
​
        // 2.  Create client 
        Client client = ClientFactory.createClient(appId, tableGroupId, appPassword, dirList);
        try {
            // 3.  Construct a request to query data 
            // 3.1.  Get request object . In order to improve SDK performance ,Request Objects are reusable 
            Request request = client.acquireRequest();
            // 3.2.  Set request type and target table name 
            request.setCmd(TcaplusProtocolCsConstants.TCAPLUS_CMD_GET_REQ);
            request.setTableName(tableName);
            // 3.3.  Set each Key Value of field 
            Record record = request.addRecord();
            record.setKeyInt("gameid", 1);
            record.setKeyInt("itemid", 1);
            record.setKeyString("name", "test");
            // 3.4.  Add the to query Value Field 
            request.addFieldName("typeid");
            request.addFieldName("Data");
            request.addFieldName("uname");
​
            CountDownLatch latch = new CountDownLatch(1);
​
            // 4.  Send requests asynchronously , And specify the processor that returns the result ,post Method will immediately return 
            client.post(request, new Future() {
​
                @Override
                public void onResponse(Response response) {
                    // 5.  Processing results 
                    if (response.getResult() == 0) {
                        //  Query data successful 
                        Record result = response.fetchRecord();
                        // TODO  The subsequent processing code of successful data query can be added here 
                    } else {
                        //  Failed to query data 
                        // TODO  You can add the subsequent processing code of data query failure here 
                    }
                }
​
            });
​
            latch.await();
        } finally {
            // 6.  Destroy client objects 
            ClientFactory.destroyClient(client);
        }
    }
​
}

TcaplusDB It's a distributed product of Tencent NoSQL database , The code for storage and scheduling is completely self-developed . With cache + Landing fusion architecture 、PB Levels of storage 、 Millisecond delay 、 Lossless horizontal expansion and complex data structure . At the same time, it has rich ecological environment 、 Easy migration 、 Extremely low operation and maintenance costs and five nine high availability features . Customer coverage game 、 Internet 、 government affairs 、 Finance 、 Manufacturing and the Internet of things .