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BucketRegionCache.java
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/*
* MinIO Java SDK for Amazon S3 Compatible Cloud Storage, (C) 2015 MinIO, 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 io.minio;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* A singleton bucket/region cache map.
*/
enum BucketRegionCache {
INSTANCE;
private final Map<String, String> regionMap = new ConcurrentHashMap<>();
/**
* Returns AWS region for given bucket name.
*/
public String region(String bucketName) {
if (bucketName == null) {
return "us-east-1";
}
String region = this.regionMap.get(bucketName);
if (region == null) {
return "us-east-1";
} else {
return region;
}
}
/**
* Sets bucket name and its region to BucketRegionCache.
*/
public void set(String bucketName, String region) {
this.regionMap.put(bucketName, region);
}
/**
* Removes region cache of the bucket if any.
*/
public void remove(String bucketName) {
if (bucketName != null) {
this.regionMap.remove(bucketName);
}
}
/**
* Returns true if given bucket name is in the map else false.
*/
public boolean exists(String bucketName) {
return this.regionMap.get(bucketName) != null;
}
}