Object Storage Service:Restore objects

Usage notes

• The RestoreObject operation can be called only on Archive and Cold Archive objects.

• In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS by using other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about the regions and endpoints supported by OSS, see Regions and endpoints.

• In this topic, access credentials are obtained from environment variables. For more information about how to configure access credentials, see Configure access credentials.

• In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Create an OSSClient instance.

• To restore an object, you must have the oss:RestoreObject permission. For more information, see Common examples of RAM policies.

Restore an Archive object

The following sample code provides an example on how to restore an Archive object:

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;

public class Demo {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint of the China (Hangzhou) region is used. Specify your actual endpoint. 
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the name of the bucket. Example: examplebucket. 
        String bucketName = "examplebucket";
        // Specify the full path of the Archive object. Do not include the bucket name in the full path. 
        String objectName = "exampledir/object";

        // Create an OSSClient instance. 
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            ObjectMetadata objectMetadata = ossClient.getObjectMetadata(bucketName, objectName);

            // Check whether the object is an Archive object. 
            StorageClass storageClass = objectMetadata.getObjectStorageClass();
            if (storageClass == StorageClass.Archive) {
                // Restore the object. 
                ossClient.restoreObject(bucketName, objectName);

                // Specify the time to wait for the object to be restored. 
                do {
                    Thread.sleep(1000);
                    objectMetadata = ossClient.getObjectMetadata(bucketName, objectName);
                } while (!objectMetadata.isRestoreCompleted());
            }

            // Query the restored object. 
            OSSObject ossObject = ossClient.getObject(bucketName, objectName);
            ossObject.getObjectContent().close();
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}           

Restore a Cold Archive object

The following sample code provides an example on how to restore a Cold Archive object:

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;

public class Demo {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint of the China (Hangzhou) region is used. Specify your actual endpoint. 
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the name of the bucket. Example: examplebucket. 
        String bucketName = "examplebucket";
        // Specify the full path of the Cold Archive object. Do not include the bucket name in the full path. 
        String objectName = "exampledir/object";

        // Create an OSSClient instance. 
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            // If you want to set the storage class of the object to Cold Archive when you upload the object, use the following code. 
            // Create a PutObjectRequest request. 
            // PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName, new ByteArrayInputStream("<yourContent>".getBytes()));
            // Set the storage class of the object to Cold Archive in the object metadata. 
            // ObjectMetadata metadata = new ObjectMetadata();
            // metadata.setHeader(OSSHeaders.OSS_STORAGE_CLASS, StorageClass.ColdArchive.toString());
            // putObjectRequest.setMetadata(metadata);
            // Specify the storage class of the object when you upload the object. 
            // ossClient.putObject(putObjectRequest);

            // Specify the restoration mode of the Cold Archive object. 
            // RestoreTier.RESTORE_TIER_EXPEDITED specifies that the object is restored within 1 hour. 
            // RestoreTier.RESTORE_TIER_STANDARD specifies that the object is restored within 2 to 5 hours. 
            // RestoreTier.RESTORE_TIER_BULK specifies that the object is restored within 5 to 12 hours. 
            RestoreJobParameters jobParameters = new RestoreJobParameters(RestoreTier.RESTORE_TIER_EXPEDITED);

            // Configure parameters. For example, set the restoration mode of the object to Standard, and set the duration for which the object remains in the restored state to 2 days. 
            // The first parameter specifies the validity period (days) of the restored state. The default value is 1. This parameter takes effect for Archive and Cold Archive objects. 
            // jobParameters specifies the restoration mode of the object and takes effect only for Cold Archive objects. 
            RestoreConfiguration configuration = new RestoreConfiguration(2, jobParameters);

            // Initiate the object restoration request. 
            ossClient.restoreObject(bucketName, objectName, configuration);
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

References

• For the complete sample code that is used to restore Archive and Cold Archive objects, visit GitHub.

• For more information about the API operation that you can call to restore Archive objects and Cold Archive objects, see RestoreObject.