/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.provisionr.amazon.core;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.AmazonEC2Client;
import com.amazonaws.services.ec2.model.DescribeRegionsRequest;
import com.amazonaws.services.ec2.model.DescribeRegionsResult;
import com.google.common.base.Optional;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.Supplier;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.ForwardingLoadingCache;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import java.util.concurrent.TimeUnit;
import org.apache.provisionr.amazon.options.ProviderOptions;
import org.apache.provisionr.api.provider.Provider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ProviderClientCacheSupplier implements Supplier<ProviderClientCache> {
private static final Logger LOG = LoggerFactory.getLogger(ProviderClientCacheSupplier.class);
public static final String PROVISIONR_USER_AGENT = "Apache Provisionr, aws-sdk-java/1.3.14";
public static final int MAX_CACHE_SIZE = 100;
public static final int EXPIRE_AFTER_WRITE_IN_HOURS = 2;
private static class ProviderClientCacheLoader extends CacheLoader<Provider, AmazonEC2> {
@Override
public AmazonEC2 load(Provider provider) throws Exception {
String region = Optional.fromNullable(provider.getOptions().get(ProviderOptions.REGION))
.or(ProviderOptions.DEFAULT_REGION);
AWSCredentials credentials = new BasicAWSCredentials(provider.getAccessKey(), provider.getSecretKey());
AmazonEC2 client = new AmazonEC2Client(credentials, new ClientConfiguration()
.withUserAgent(PROVISIONR_USER_AGENT));
if (provider.getEndpoint().isPresent()) {
LOG.info("Using endpoint {} as configured", provider.getEndpoint().get());
client.setEndpoint(provider.getEndpoint().get());
} else {
LOG.info(">> Searching endpoint for region {}", region);
DescribeRegionsRequest request = new DescribeRegionsRequest().withRegionNames(region);
DescribeRegionsResult result = client.describeRegions(request);
checkArgument(result.getRegions().size() == 1, "Invalid region name %s. Expected one result found %s",
region, result.getRegions());
LOG.info("<< Using endpoint {} for region {}", result.getRegions().get(0).getEndpoint(), region);
client.setEndpoint(result.getRegions().get(0).getEndpoint());
}
return client;
}
}
public static class WrapLoadingCacheAsProviderClientCache extends ForwardingLoadingCache<Provider, AmazonEC2>
implements ProviderClientCache {
private final LoadingCache<Provider, AmazonEC2> delegate;
public WrapLoadingCacheAsProviderClientCache(LoadingCache<Provider, AmazonEC2> delegate) {
this.delegate = checkNotNull(delegate, "delegate is null");
}
@Override
protected LoadingCache<Provider, AmazonEC2> delegate() {
return delegate;
}
}
@Override
public ProviderClientCache get() {
final LoadingCache<Provider, AmazonEC2> cache = CacheBuilder.newBuilder()
.maximumSize(MAX_CACHE_SIZE)
.expireAfterWrite(EXPIRE_AFTER_WRITE_IN_HOURS, TimeUnit.HOURS)
.removalListener(new RemovalListener<Provider, AmazonEC2>() {
@Override
public void onRemoval(RemovalNotification<Provider, AmazonEC2> notification) {
LOG.info("Closing client for provider: {}", notification.getKey());
notification.getValue().shutdown();
}
})
.build(new ProviderClientCacheLoader());
return new WrapLoadingCacheAsProviderClientCache(cache);
}
}