获取AWS Step函数中状态机的所有失败执行，并动态执行.(在java)

Question

我想获取所有失败的执行，并需要动态地重新触发它们。

PS:在步骤函数定义中，我有适当的重试机制，现在我想动态地重新运行失败的执行。

我需要在java中实现它。请帮我一下方法。

提前感谢。

Answer 1

您可以使用AWS步骤函数API获取执行列表:

https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/sfn/SfnClient.html listExecutions——

你可以得到一个列表ExecutionListItem通过调用执行()方法，属于ListExecutionsResponselistExecutions返回方法)https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/sfn/model/ExecutionListItem.html

使用这个对象-你可以做两件事:

1 -检查状态- https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/sfn/model/ExecutionStatus.html

2 -获取状态机ARN值- https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/sfn/model/ExecutionListItem.html#stateMachineArn--

使用状态机ARN值，您可以使用AWS步骤函数Java API V2执行状态机:

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.sfn.SfnClient;
import software.amazon.awssdk.services.sfn.model.*;
import java.io.FileReader;
import java.io.IOException;
import java.util.UUID;
// snippet-end:[stepfunctions.java2.start_execute.import]
public class StartExecution {
public static void main(String[] args) {
final String USAGE = "n" +
"Usage:n" +
"    StartExecution <stateMachineArn> <jsonFile>nn" +
"Where:n" +
"    stateMachineArn - the ARN of the state machine.nn" +
"    jsonFile - A JSON file that contains the values to pass to the worflow.n" ;
if (args.length != 2) {
System.out.println(USAGE);
System.exit(1);
}
String stateMachineArn = args[0];
String jsonFile = args[1];
Region region = Region.US_EAST_1;
SfnClient sfnClient = SfnClient.builder()
.region(region)
.build();
String exeArn = startWorkflow(sfnClient,stateMachineArn, jsonFile);
System.out.println("The execution ARN is" +exeArn);
sfnClient.close();
}
// snippet-start:[stepfunctions.java2.start_execute.main]
public static String startWorkflow(SfnClient sfnClient, String stateMachineArn, String jsonFile) {
String json = getJSONString(jsonFile);
// Specify the name of the execution by using a GUID value.
UUID uuid = UUID.randomUUID();
String uuidValue = uuid.toString();
try {
StartExecutionRequest executionRequest = StartExecutionRequest.builder()
.input(json)
.stateMachineArn(stateMachineArn)
.name(uuidValue)
.build();
StartExecutionResponse response = sfnClient.startExecution(executionRequest);
return response.executionArn();

} catch (SfnException e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
return "";
}
private static String getJSONString(String path) {
try {
JSONParser parser = new JSONParser();
JSONObject data = (JSONObject) parser.parse(new FileReader(path));//path to the JSON file.
String json = data.toJSONString();
return json;
} catch (IOException |  org.json.simple.parser.ParseException e) {
e.printStackTrace();
}
return "";
}
// snippet-end:[stepfunctions.java2.start_execute.main]
}