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/*
* Copyright 2012 Netflix, Inc.
*
* 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 com.netflix.exhibitor.core.config.s3;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.s3.model.ListObjectsRequest;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3ObjectSummary;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.netflix.exhibitor.core.config.PseudoLockBase;
import com.netflix.exhibitor.core.s3.S3Client;
import java.io.ByteArrayInputStream;
import java.util.List;
public class S3PseudoLock extends PseudoLockBase
{
private final S3Client client;
private final String bucket;
/**
* @param client the S3 client
* @param bucket the S3 bucket
* @param lockPrefix key prefix
* @param timeoutMs max age for locks
* @param pollingMs how often to poll S3
*/
public S3PseudoLock(S3Client client, String bucket, String lockPrefix, int timeoutMs, int pollingMs)
{
super(lockPrefix, timeoutMs, pollingMs);
this.client = client;
this.bucket = bucket;
}
/**
* @param client the S3 client
* @param bucket the S3 bucket
* @param lockPrefix key prefix
* @param timeoutMs max age for locks
* @param pollingMs how often to poll S3
* @param settlingMs how long to wait for S3 to reach consistency
*/
public S3PseudoLock(S3Client client, String bucket, String lockPrefix, int timeoutMs, int pollingMs, int settlingMs)
{
super(lockPrefix, timeoutMs, pollingMs, settlingMs);
this.client = client;
this.bucket = bucket;
}
/**
* @param client the S3 client
* @param bucket the S3 bucket
* @param lockPrefix key prefix
* @param timeoutMs max age for locks
* @param pollingMs how often to poll S3
* @param settlingMs how long to wait for S3 to reach consistency
* @param lockKeySeparator the separator to use for the lock key
*/
public S3PseudoLock(S3Client client, String bucket, String lockPrefix, int timeoutMs, int pollingMs, int settlingMs, String lockKeySeparator)
{
super(lockPrefix, timeoutMs, pollingMs, settlingMs, lockKeySeparator);
this.client = client;
this.bucket = bucket;
}
@Override
protected void createFile(String key, byte[] contents) throws Exception
{
ObjectMetadata metadata = new ObjectMetadata();
metadata.setContentLength(contents.length);
PutObjectRequest request = new PutObjectRequest(bucket, key, new ByteArrayInputStream(contents), metadata);
client.putObject(request);
}
@Override
protected void deleteFile(String key) throws Exception
{
try
{
client.deleteObject(bucket, key);
}
catch ( AmazonServiceException ignore )
{
// ignore these
}
}
@Override
protected List getFileNames(String lockPrefix) throws Exception
{
ListObjectsRequest request = new ListObjectsRequest();
request.setBucketName(bucket);
request.setPrefix(lockPrefix);
ObjectListing objectListing = client.listObjects(request);
return Lists.transform
(
objectListing.getObjectSummaries(),
new Function()
{
@Override
public String apply(S3ObjectSummary summary)
{
return summary.getKey();
}
}
);
}
}