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ListVersionsSample.java
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ListVersionsSample.java
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/**
* Copyright 2019 Huawei Technologies Co.,Ltd.
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use
* this file except in compliance with the License. You may obtain a copy of the
* License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package samples_java;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import com.obs.services.ObsClient;
import com.obs.services.ObsConfiguration;
import com.obs.services.exception.ObsException;
import com.obs.services.model.BucketVersioningConfiguration;
import com.obs.services.model.DeleteObjectsRequest;
import com.obs.services.model.DeleteObjectsResult;
import com.obs.services.model.DeleteObjectsResult.DeleteObjectResult;
import com.obs.services.model.KeyAndVersion;
import com.obs.services.model.ListVersionsRequest;
import com.obs.services.model.ListVersionsResult;
import com.obs.services.model.ObjectListing;
import com.obs.services.model.ObsObject;
import com.obs.services.model.VersionOrDeleteMarker;
import com.obs.services.model.VersioningStatusEnum;
/**
* This sample demonstrates how to list versions under specified bucket
* from OBS using the OBS SDK for Java.
*/
public class ListVersionsSample
{
private static final String endPoint = "https://your-endpoint";
private static final String ak = "*** Provide your Access Key ***";
private static final String sk = "*** Provide your Secret Key ***";
private static ObsClient obsClient;
private static String bucketName = "my-obs-bucket-demo";
public static void main(String[] args)
throws UnsupportedEncodingException
{
ObsConfiguration config = new ObsConfiguration();
config.setSocketTimeout(30000);
config.setConnectionTimeout(10000);
config.setEndPoint(endPoint);
try
{
/*
* Constructs a obs client instance with your account for accessing OBS
*/
obsClient = new ObsClient(ak, sk, config);
/*
* Create bucket
*/
obsClient.createBucket(bucketName);
/*
* Enable bucket versioning
*/
obsClient.setBucketVersioning(bucketName, new BucketVersioningConfiguration(VersioningStatusEnum.ENABLED));
final String content = "Hello OBS";
final String keyPrefix = "MyObjectKey";
final String folderPrefix = "src";
final String subFolderPrefix = "test";
ObjectListing objectListing = null;
ListVersionsResult listVersionResult = null;
List<String> keys = new ArrayList<String>();
VersionOrDeleteMarker[] versionsToDelete;
/*
* First prepare folders and sub folders
*/
for (int i = 0; i < 5; i++)
{
String key = folderPrefix + i + "/";
obsClient.putObject(bucketName, key, new ByteArrayInputStream(new byte[0]), null);
keys.add(key);
for (int j = 0; j < 3; j++)
{
String subKey = key + subFolderPrefix + j + "/";
obsClient.putObject(bucketName, subKey, new ByteArrayInputStream(new byte[0]));
keys.add(subKey);
}
}
/*
* Insert 2 objects in each folder
*/
objectListing = obsClient.listObjects(bucketName);
for (ObsObject object : objectListing.getObjects())
{
for (int i = 0; i < 2; i++)
{
String objectKey = object.getObjectKey() + keyPrefix + i;
obsClient.putObject(bucketName, objectKey, new ByteArrayInputStream(content.getBytes("UTF-8")), null);
keys.add(objectKey);
}
}
/*
* Insert 2 objects in root path
*/
obsClient.putObject(bucketName, keyPrefix + 0, new ByteArrayInputStream(content.getBytes("UTF-8")), null);
obsClient.putObject(bucketName, keyPrefix + 1, new ByteArrayInputStream(content.getBytes("UTF-8")), null);
keys.add(keyPrefix + 0);
keys.add(keyPrefix + 1);
System.out.println("Put " + keys.size() + " objects completed.");
System.out.println();
/*
* List versions using default parameters, will return up to 1000 objects
*/
System.out.println("List versions using default parameters:\n");
listVersionResult = obsClient.listVersions(bucketName);
versionsToDelete = listVersionResult.getVersions();
for (VersionOrDeleteMarker versionOrDeleteMarker : listVersionResult.getVersions())
{
System.out.println("\t" + versionOrDeleteMarker.getKey() + " etag[" + versionOrDeleteMarker.getEtag() + "]" + " versionid["
+ versionOrDeleteMarker.getVersionId() + "]");
}
System.out.println();
/*
* List all the versions in way of pagination
*/
System.out.println("List all the versions in way of pagination:\n");
int index = 1;
ListVersionsRequest listRequest = new ListVersionsRequest(bucketName);
listRequest.setMaxKeys(10);
do
{
listVersionResult = obsClient.listVersions(listRequest);
System.out.println("Page:" + index++ + "\n");
for (VersionOrDeleteMarker versionOrDeleteMarker : listVersionResult.getVersions())
{
System.out.println("\t" + versionOrDeleteMarker.getKey() + " etag[" + versionOrDeleteMarker.getEtag() + "]"
+ " versionid[" + versionOrDeleteMarker.getVersionId() + "]");
}
listRequest.setKeyMarker(listVersionResult.getNextKeyMarker());
listRequest.setVersionIdMarker(listVersionResult.getNextVersionIdMarker());
} while (listVersionResult.isTruncated());
System.out.println();
/*
* List all versions group by folder
*/
System.out.println("List all versions group by folder \n");
listRequest = new ListVersionsRequest(bucketName);
listRequest.setDelimiter("/");
listRequest.setMaxKeys(1000);
listVersionResult = obsClient.listVersions(listRequest);
System.out.println("Root path:");
for (VersionOrDeleteMarker versionOrDeleteMarker : listVersionResult.getVersions())
{
System.out.println("\t" + versionOrDeleteMarker.getKey() + " etag[" + versionOrDeleteMarker.getEtag() + "]" + " versionid["
+ versionOrDeleteMarker.getVersionId() + "]");
}
listVersionsByPrefix(listVersionResult);
System.out.println();
/*
* Delete all the objects created
*/
DeleteObjectsRequest request = new DeleteObjectsRequest();
request.setBucketName(bucketName);
request.setQuiet(false);
index = 0;
KeyAndVersion[] kvs = new KeyAndVersion[versionsToDelete.length];
for (VersionOrDeleteMarker versionOrDeleteMarker : versionsToDelete)
{
kvs[index++] = new KeyAndVersion(versionOrDeleteMarker.getKey(), versionOrDeleteMarker.getVersionId());
}
request.setKeyAndVersions(kvs);
System.out.println("Delete results:");
DeleteObjectsResult deleteObjectsResult = obsClient.deleteObjects(request);
for (DeleteObjectResult object : deleteObjectsResult.getDeletedObjectResults())
{
System.out.println("\t" + object);
}
}
catch (ObsException e)
{
System.out.println("Response Code: " + e.getResponseCode());
System.out.println("Error Message: " + e.getErrorMessage());
System.out.println("Error Code: " + e.getErrorCode());
System.out.println("Request ID: " + e.getErrorRequestId());
System.out.println("Host ID: " + e.getErrorHostId());
}
finally
{
if (obsClient != null)
{
try
{
/*
* Close obs client
*/
obsClient.close();
}
catch (IOException e)
{
}
}
}
}
private static void listVersionsByPrefix(ListVersionsResult listVersionResult)
throws ObsException
{
for (String prefix : listVersionResult.getCommonPrefixes())
{
System.out.println("Folder " + prefix + ":");
ListVersionsRequest request = new ListVersionsRequest(bucketName);
request.setPrefix(prefix);
request.setDelimiter("/");
request.setMaxKeys(1000);
listVersionResult = obsClient.listVersions(request);
for (VersionOrDeleteMarker versionOrDeleteMarker : listVersionResult.getVersions())
{
System.out.println("\t" + versionOrDeleteMarker.getKey() + " etag[" + versionOrDeleteMarker.getEtag() + "]"
+ " versionid[" + versionOrDeleteMarker.getVersionId() + "]");
}
listVersionsByPrefix(listVersionResult);
}
}
}