org.jclouds.ec2.suppliers.DescribeAvailabilityZonesInRegion.java Source code

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Here is the source code for org.jclouds.ec2.suppliers.DescribeAvailabilityZonesInRegion.java

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/*
 * 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.jclouds.ec2.suppliers;

import java.util.Map;
import java.util.Set;

import javax.annotation.Resource;
import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.ec2.EC2Api;
import org.jclouds.ec2.domain.AvailabilityZoneInfo;
import org.jclouds.ec2.features.AvailabilityZoneAndRegionApi;
import org.jclouds.http.HttpResponseException;
import org.jclouds.location.Region;
import org.jclouds.location.suppliers.RegionIdToZoneIdsSupplier;
import org.jclouds.logging.Logger;
import org.jclouds.util.Suppliers2;

import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;

@Singleton
public class DescribeAvailabilityZonesInRegion implements RegionIdToZoneIdsSupplier {
    @Resource
    protected Logger logger = Logger.NULL;

    private final AvailabilityZoneAndRegionApi client;
    private final Supplier<Set<String>> regions;

    @Inject
    public DescribeAvailabilityZonesInRegion(EC2Api client, @Region Supplier<Set<String>> regions) {
        this.client = client.getAvailabilityZoneAndRegionApi().get();
        this.regions = regions;
    }

    @Override
    public Map<String, Supplier<Set<String>>> get() {
        Builder<String, Set<String>> map = ImmutableMap.builder();
        HttpResponseException exception = null;
        // TODO: this should be parallel
        for (String region : regions.get()) {
            try {
                ImmutableSet<String> zones = ImmutableSet
                        .copyOf(Iterables.transform(client.describeAvailabilityZonesInRegion(region),
                                new Function<AvailabilityZoneInfo, String>() {

                                    @Override
                                    public String apply(AvailabilityZoneInfo arg0) {
                                        return arg0.getZone();
                                    }

                                }));
                if (zones.size() > 0)
                    map.put(region, zones);
            } catch (HttpResponseException e) {
                // TODO: this should be in retry handler, not here.
                if (e.getMessage().contains("Unable to tunnel through proxy")) {
                    exception = e;
                    logger.error(e, "Could not describe availability zones in Region: %s", region);
                } else {
                    throw e;
                }
            }
        }
        ImmutableMap<String, Set<String>> result = map.build();
        if (result.isEmpty() && exception != null) {
            throw exception;
        }
        return Maps.transformValues(result, Suppliers2.<Set<String>>ofInstanceFunction());
    }

}