Help Center/ Object Storage Service/ SDK Reference/ Java/ Object Download (SDK for Java)/ Restoring an Archive Object (SDK for Java)
Updated on 2024-06-18 GMT+08:00

Restoring an Archive Object (SDK for Java)

Function

This API downloads an Archive object. To download such an object, you must restore it first. Archive objects can be restored in either of the following ways.

Option

Description

Value in OBS Java SDK

Expedited

Data can be restored within 1 to 5 minutes.

RestoreTierEnum.EXPEDITED

Standard

Data can be restored within 3 to 5 hours. This is the default option.

RestoreTierEnum.STANDARD

If you have any questions during development, post them on the Issues page of GitHub.

Restrictions

  • To restore object, you must be the bucket owner or have the required permission (obs:object:RestoreObject in IAM or RestoreObject in a bucket policy.) For details, see Introduction to OBS Access Control, IAM Custom Policies, and Configuring an Object Policy.
  • The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.
  • The object specified in ObsClient.restoreObject must be in the Archive storage class. Otherwise, an exception will be thrown when you call this API.

Method

obsClient.restoreObject(RestoreObjectRequest request)

Request Parameters

Table 1 List of request parameters

Parameter

Type

Mandatory (Yes/No)

Description

request

RestoreObjectRequest

Yes

Explanation:

Request parameters for downloading an object. For details, see Table 2.

Table 2 RestoreObjectRequest

Parameter

Type

Mandatory (Yes/No)

Description

bucketName

String

Yes

Explanation:

Bucket name.

Restrictions:

  • A bucket name must be unique across all accounts and regions.
  • A bucket name:
    • Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed.
    • Cannot be formatted as an IP address.
    • Cannot start or end with a hyphen (-) or period (.).
    • Cannot contain two consecutive periods (..), for example, my..bucket.
    • Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket.
  • If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request.

Default value:

None

objectKey

String

Yes

Explanation:

Object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name.

For example, if the address for accessing the object is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt.

Value range:

The value must contain 1 to 1,024 characters.

Default value:

None

versionId

String

No

Explanation:

Version ID of the Archive object to restore.

Default value:

None. If this parameter is left blank, the latest version of the object is specified.

days

int

Yes

Explanation:

After an object is restored, a Standard copy of it is generated. This parameter specifies how long the Standard copy can be retained, that is, the validity period of the restored object.

Restrictions:

The value must be a positive integer.

Value range:

The value ranges from 1 to 30, in days.

Default value:

None

tier

RestoreTierEnum

No

Explanation:

The restore option, which indicates the time spent on restoring the object.

Value range:

For details, see Table 3.

Default value:

Standard

Table 3 RestoreTierEnum

Constant

Default Value

Description

EXPEDITED

Expedited

Objects can be restored at an expedited speed within 1 to 5 minutes.

STANDARD

Standard

Objects can be restored at a standard speed within 3 to 5 hours.

Responses

Table 4 RestoreObjectStatus

Parameter

Type

Description

statusCode

int

Explanation:

HTTP status code.

Value range:

A status code is a group of digits that can be 2xx (indicating successes) or 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code.

Default value:

None

responseHeaders

Map<String, Object>

Explanation:

Response header list, composed of tuples. In a tuple, the String key indicates the name of the header, and the Object value indicates the value of the header.

Default value:

None

Code Examples

This example restores object objectname from the Archive storage class using ObsClient.restoreObject and downloads it using ObsClient.getObject.

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import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.ObsObject;
import com.obs.services.model.RestoreObjectRequest;
import com.obs.services.model.RestoreTierEnum;
public class GetObject007 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com";
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // Download an Archive object.
            RestoreObjectRequest request = new RestoreObjectRequest();
            request.setBucketName("examplebucket");
            request.setObjectKey("objectname");
            request.setDays(1);
            request.setRestoreTier(RestoreTierEnum.EXPEDITED);
            obsClient.restoreObject(request);
            // Wait for the object to be restored.
            Thread.sleep(60 * 6 * 1000);
            // Download the object.
            ObsObject obsObject = obsClient.getObject("examplebucket", "objectname");
            System.out.println("getObject successfully");
            obsObject.getObjectContent().close();
        } catch (ObsException e) {
            System.out.println("getObject failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("getObject failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}