如何使用Java调用CDM的Rest API创建数据迁移作业？

CDM提供了Rest API，可以通过程序调用实现自动化的作业创建或执行控制。

这里以CDM迁移MySQL数据库的表city1的数据到DWS的表city2为例，介绍如何使用Java调用CDM服务的REST API创建、启动、查询、删除该CDM作业。

需要提前准备以下数据：

云账号的用户名、账号名和项目ID。
创建一个CDM集群，并获取集群ID。
获取方法：在集群管理界面，单击CDM集群名称可查看集群ID，例如“c110beff-0f11-4e75-8b10-da7cd882b0ef”。

创建一个MySQL数据库和一个DWS数据库，并创建好表city1和表city2，创表语句如下：

MySQL:
create table city1(code varchar(10),name varchar(32));
insert into city1 values('NY','New York');
DWS:
create table city2(code varchar(10),name varchar(32));

在CDM集群下，创建连接到MySQL的连接，例如连接名称为“mysqltestlink”。创建连接到DWS的连接，例如连接名称为“dwstestlink”。

运行下述代码，依赖HttpClient包，建议使用4.5版本。Maven配置如下：

<project>
<modelVersion>4.0.0</modelVersion>
<groupId>cdm</groupId>
<artifactId>cdm-client</artifactId>
<version>1</version>
<dependencies>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5</version>
</dependency>
</dependencies>
</project>

代码示例

使用Java调用CDM服务的REST API创建、启动、查询、删除CDM作业的代码示例如下：

package cdmclient;
import java.io.IOException;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class CdmClient {
private final static String DOMAIN_NAME="云账号名";
private final static String USER_NAME="云用户名";
private final static String USER_PASSWORD="云用户密码";
private final static String PROJECT_ID="项目ID";
private final static String CLUSTER_ID="CDM集群ID";
private final static String JOB_NAME="作业名称";
private final static String FROM_LINKNAME="源连接名称";
private final static String TO_LINKNAME="目的连接名称";
private final static String IAM_ENDPOINT="IAM的Endpoint";
private final static String CDM_ENDPOINT="CDM的Endpoint";

private CloseableHttpClient httpclient;
private String token;

public CdmClient() {
this.httpclient = createHttpClient();
this.token = login();
}

private CloseableHttpClient createHttpClient() {
CloseableHttpClient httpclient =HttpClients.createDefault();
return httpclient;
}

private String login(){
HttpPost httpPost = new HttpPost("https://"+IAM_ENDPOINT+"/v3/auth/tokens");
String json =
"{\r\n"+
"\"auth\": {\r\n"+
"\"identity\": {\r\n"+
"\"methods\": [\"password\"],\r\n"+
"\"password\": {\r\n"+
"\"user\": {\r\n"+
"\"name\": \""+USER_NAME+"\",\r\n"+
"\"password\": \""+USER_PASSWORD+"\",\r\n"+
"\"domain\": {\r\n"+
"\"name\": \""+DOMAIN_NAME+"\"\r\n"+
"}\r\n"+
"}\r\n"+
"}\r\n"+
"},\r\n"+
"\"scope\": {\r\n"+
"\"project\": {\r\n"+
"\"name\": \"PROJECT_NAME\"\r\n"+
"}\r\n"+
"}\r\n"+
"}\r\n"+
"}\r\n";
try {
StringEntity s = new StringEntity(json);
s.setContentEncoding("UTF-8");
s.setContentType("application/json");
httpPost.setEntity(s);
CloseableHttpResponse response = httpclient.execute(httpPost);
Header tokenHeader = response.getFirstHeader("X-Subject-Token");
String token = tokenHeader.getValue();
System.out.println("Login successful");
return token;
} catch (Exception e) {
throw new RuntimeException("login failed.", e);
}
}

/*创建作业*/

public void createJob(){
HttpPost httpPost = new HttpPost("https://"+CDM_ENDPOINT+"/cdm/v1.0/"+PROJECT_ID+"/clusters/"+CLUSTER_ID+"/cdm/job");

/**此处JSON信息比较复杂，可以先在作业管理界面上创建一个作业，然后单击作业后的“作业JSON定义”，复制其中的JSON内容，格式化为Java字符串语法，然后粘贴到此处。
*JSON消息体中一般只需要替换连接名、导入和导出的表名、导入导出表的字段列表、源表中用于分区的字段。**/

String json =
"{\r\n"+
"\"jobs\": [\r\n"+
"{\r\n"+
"\"from-connector-name\": \"generic-jdbc-connector\",\r\n"+
"\"name\": \""+JOB_NAME+"\",\r\n"+
"\"to-connector-name\": \"generic-jdbc-connector\",\r\n"+
"\"driver-config-values\": {\r\n"+
"\"configs\": [\r\n"+
"{\r\n"+
"\"inputs\": [\r\n"+
"{\r\n"+
"\"name\": \"throttlingConfig.numExtractors\",\r\n"+
"\"value\": \"1\"\r\n"+
"}\r\n"+
"],\r\n"+
"\"validators\": [],\r\n"+
"\"type\": \"JOB\",\r\n"+
"\"id\": 30,\r\n"+
"\"name\": \"throttlingConfig\"\r\n"+
"}\r\n"+
"]\r\n"+
"},\r\n"+
"\"from-link-name\": \""+FROM_LINKNAME+"\",\r\n"+
"\"from-config-values\": {\r\n"+
"\"configs\": [\r\n"+
"{\r\n"+
"\"inputs\": [\r\n"+
"{\r\n"+
"\"name\": \"fromJobConfig.schemaName\",\r\n"+
"\"value\": \"sqoop\"\r\n"+
"},\r\n"+
"{\r\n"+
"\"name\": \"fromJobConfig.tableName\",\r\n"+
"\"value\": \"city1\"\r\n"+
"},\r\n"+
"{\r\n"+
"\"name\": \"fromJobConfig.columnList\",\r\n"+
"\"value\": \"code&name\"\r\n"+
"},\r\n"+
"{\r\n"+
"\"name\": \"fromJobConfig.partitionColumn\",\r\n"+
"\"value\": \"code\"\r\n"+
"}\r\n"+
"],\r\n"+
"\"validators\": [],\r\n"+
"\"type\": \"JOB\",\r\n"+
"\"id\": 7,\r\n"+
"\"name\": \"fromJobConfig\"\r\n"+
"}\r\n"+
"]\r\n"+
"},\r\n"+
"\"to-link-name\": \""+TO_LINKNAME+"\",\r\n"+
"\"to-config-values\": {\r\n"+
"\"configs\": [\r\n"+
"{\r\n"+
"\"inputs\": [\r\n"+
"{\r\n"+
"\"name\": \"toJobConfig.schemaName\",\r\n"+
"\"value\": \"sqoop\"\r\n"+
"},\r\n"+
"{\r\n"+
"\"name\": \"toJobConfig.tableName\",\r\n"+
"\"value\": \"city2\"\r\n"+
"},\r\n"+
"{\r\n"+
"\"name\": \"toJobConfig.columnList\",\r\n"+
"\"value\": \"code&name\"\r\n"+
"}, \r\n"+
"{\r\n"+
"\"name\": \"toJobConfig.shouldClearTable\",\r\n"+
"\"value\": \"true\"\r\n"+
"}\r\n"+
"],\r\n"+
"\"validators\": [],\r\n"+
"\"type\": \"JOB\",\r\n"+
"\"id\": 9,\r\n"+
"\"name\": \"toJobConfig\"\r\n"+
"}\r\n"+
"]\r\n"+
"}\r\n"+
"}\r\n"+
"]\r\n"+
"}\r\n";
try {
StringEntity s = new StringEntity(json);
s.setContentEncoding("UTF-8");
s.setContentType("application/json");
httpPost.setEntity(s);
httpPost.addHeader("X-Auth-Token", this.token);
httpPost.addHeader("X-Language", "en-us");
CloseableHttpResponse response = httpclient.execute(httpPost);
int status = response.getStatusLine().getStatusCode();
if(status == 200){
System.out.println("Create job successful.");
}else{
System.out.println("Create job failed.");
HttpEntity entity = response.getEntity();
System.out.println(EntityUtils.toString(entity));
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("Create job failed.", e);
}
}

/*启动作业*/

public void startJob(){
HttpPut httpPut = new HttpPut("https://"+CDM_ENDPOINT+"/cdm/v1.0/"+PROJECT_ID+"/clusters/"+CLUSTER_ID+"/cdm/job/"+JOB_NAME+"/start");
String json = "";
try {
StringEntity s = new StringEntity(json);
s.setContentEncoding("UTF-8");
s.setContentType("application/json");
httpPut.setEntity(s);
httpPut.addHeader("X-Auth-Token", this.token);
httpPut.addHeader("X-Language", "en-us");
CloseableHttpResponse response = httpclient.execute(httpPut);
int status = response.getStatusLine().getStatusCode();
if(status == 200){
System.out.println("Start job successful.");
}else{
System.out.println("Start job failed.");
HttpEntity entity = response.getEntity();
System.out.println(EntityUtils.toString(entity));
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("Start job failed.", e);
}
}

/*循环查询作业运行状态，直到作业运行结束。*/

public void getJobStatus(){
HttpGet httpGet = new HttpGet("https://"+CDM_ENDPOINT+"/cdm/v1.0/"+PROJECT_ID+"/clusters/"+CLUSTER_ID+"/cdm/job/"+JOB_NAME+"/status");
try {
httpGet.addHeader("X-Auth-Token", this.token);
httpGet.addHeader("X-Language", "en-us");
boolean flag = true;
while(flag){
CloseableHttpResponse response = httpclient.execute(httpGet);
int status = response.getStatusLine().getStatusCode();
if(status == 200){
HttpEntity entity = response.getEntity();
String msg = EntityUtils.toString(entity);
if(msg.contains("\"status\":\"SUCCEEDED\"")){
System.out.println("Job succeeded");
break;
}else if (msg.contains("\"status\":\"FAILED\"")){
System.out.println("Job failed.");
break;
}else{
Thread.sleep(1000);
}

}else{
System.out.println("Get job status failed.");
HttpEntity entity = response.getEntity();
System.out.println(EntityUtils.toString(entity));
break;
}
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("Get job status failed.", e);
}
}

/*删除作业*/

public void deleteJob(){
HttpDelete httpDelte = new HttpDelete("https://"+CDM_ENDPOINT+"/cdm/v1.0/"+PROJECT_ID+"/clusters/"+CLUSTER_ID+"/cdm/job/"+JOB_NAME);
try {
httpDelte.addHeader("X-Auth-Token", this.token);
httpDelte.addHeader("X-Language", "en-us");
CloseableHttpResponse response = httpclient.execute(httpDelte);
int status = response.getStatusLine().getStatusCode();
if(status == 200){
System.out.println("Delete job successful.");
}else{
System.out.println("Delete job failed.");
HttpEntity entity = response.getEntity();
System.out.println(EntityUtils.toString(entity));
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("Delete job failed.", e);
}
}

/*关闭*/

public void close(){
try {
httpclient.close();
} catch (IOException e) {
throw new RuntimeException("Close failed.", e);
}
}

public static void main(String[] args){
CdmClient cdmClient = new CdmClient();
cdmClient.createJob();
cdmClient.startJob();
cdmClient.getJobStatus();
cdmClient.deleteJob();
cdmClient.close();
}
}

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