Elastic Compute Service：查詢搶佔式執行個體中斷事件

程式碼範例（DescribeInstancesSample.java）如下所示：

import com.alibaba.fastjson.JSONArray;
import com.aliyuncs.AcsRequest;
import com.aliyuncs.AcsResponse;
import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.ecs.model.v20140526.DescribeInstancesRequest;
import com.aliyuncs.ecs.model.v20140526.DescribeInstancesResponse;
import com.aliyuncs.profile.DefaultProfile;
import com.aliyuncs.profile.IClientProfile;
import java.util.*;

public class DescribeInstancesSample {
    public static void main(String[] args) throws InterruptedException {
        // 初始化DefaultAcsClient執行個體。
        OpenApiCaller caller = new OpenApiCaller();
        // 設定待查詢的一個或多個ECS執行個體ID。
        JSONArray allInstances = new JSONArray();
        allInstances.addAll(Arrays.asList("i-bp1i9c3qiv1qs6nc****"));
        while (!allInstances.isEmpty()) {
            DescribeInstancesRequest request = new DescribeInstancesRequest();
            // 指定執行個體所在的地區。
            request.setRegionId("cn-hangzhou");
            // 指定執行個體ID，查詢效率高。
            request.setInstanceIds(allInstances.toJSONString());
            // 接收響應結果。
            DescribeInstancesResponse response = caller.doAction(request);
            // 擷取執行個體相關的返回結果。
            List<DescribeInstancesResponse.Instance> instanceList = response.getInstances();
            if (instanceList != null && !instanceList.isEmpty()) {
                for (DescribeInstancesResponse.Instance instance : instanceList) {
                    // 輸出被查詢的執行個體ID與可用性區域資訊。
                    System.out.println("result:instance:" + instance.getInstanceId() + ",az:" + instance.getZoneId());
                    if (instance.getOperationLocks() != null) {
                        for (DescribeInstancesResponse.Instance.LockReason lockReason : instance.getOperationLocks()) {
                            // 如果執行個體被鎖定，輸出指定執行個體ID以及對應的鎖定類型。
                            System.out.println("instance:" + instance.getInstanceId() + "-->lockReason:" + lockReason.getLockReason() + ",vmStatus:" + instance.getStatus());
                            if ("Recycling".equals(lockReason.getLockReason())) {
                                // 輸出即將被回收的執行個體ID資訊。
                                System.out.println("spot instance will be recycled immediately, instance id:" + instance.getInstanceId());
                                allInstances.remove(instance.getInstanceId());
                            }
                        }
                    }
                }
                // 如果搶佔式執行個體還未被鎖定，將每隔兩分鐘查詢一次。
                System.out.print("try describeInstances again later ...");
                Thread.sleep(2 * 60 * 1000);
            } else {
                break;
            }
        }
    }
}

// 初始化DefaultAcsClient執行個體的類。
class OpenApiCaller{
    IClientProfile profile;
    IAcsClient client;
    public OpenApiCaller() {
        // 請確保代碼運行環境設定了環境變數ALIBABA_CLOUD_ACCESS_KEY_ID和ALIBABA_CLOUD_ACCESS_KEY_SECRET。
        // 工程代碼泄露可能會導致AccessKey泄露，並威脅帳號下所有資源的安全性。以下程式碼範例使用環境變數擷取AccessKey的方式進行調用，建議使用更安全的STS方式。
        profile = DefaultProfile.getProfile("cn-hangzhou", System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID"), System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET"));
        client = new DefaultAcsClient(profile);
    }

    public  <T extends AcsResponse> T doAction(AcsRequest<T> var1) {
        try {
            return  client.getAcsResponse(var1);
        } catch (Throwable e) {
            e.printStackTrace();
            return null;
        }
    }
}

觸發回收時輸出結果如下：

result:instance:i-bp1i9c3qiv1qs6nc****,az:cn-hangzhou-i
instance:i-bp1i9c3qiv1qs6nc****-->lockReason:Recycling,vmStatus:Stopped
spot instance will be recycled immediately, instance id:i-bp1i9c3qiv1qs6nc****