/**
* Licensed to jclouds, Inc. (jclouds) under one or more
* contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. jclouds licenses this file
* to you 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 org.jclouds.s3.functions;
import java.util.concurrent.ExecutionException;
import javax.annotation.Resource;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.jclouds.logging.Logger;
import org.jclouds.s3.Bucket;
import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.cache.CacheLoader.InvalidCacheLoadException;
import com.google.common.cache.LoadingCache;
import com.google.common.util.concurrent.UncheckedExecutionException;
/**
*
* @author Adrian Cole
*/
@Singleton
public class GetRegionForBucket implements Function<String, Optional<String>> {
@Resource
protected Logger logger = Logger.NULL;
protected final LoadingCache<String, Optional<String>> bucketToRegion;
@Inject
public GetRegionForBucket(@Bucket LoadingCache<String, Optional<String>> bucketToRegion) {
this.bucketToRegion = bucketToRegion;
}
@Override
public Optional<String> apply(String bucket) {
try {
return bucketToRegion.get(bucket);
} catch (ExecutionException e) {
logger.debug("error looking up region for bucket %s: %s", bucket, e);
} catch (UncheckedExecutionException e) {
logger.debug("error looking up region for bucket %s: %s", bucket, e);
} catch (InvalidCacheLoadException e) {
logger.trace("bucket %s not found: %s", bucket, e);
}
return Optional.absent();
}
}