org.jclouds.cloudstack.predicates.CorrectHypervisorForZone.java Source code

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Here is the source code for org.jclouds.cloudstack.predicates.CorrectHypervisorForZone.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.cloudstack.predicates;

import static com.google.common.base.Preconditions.checkNotNull;

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

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.cloudstack.CloudStackClient;
import org.jclouds.cloudstack.domain.Template;
import org.jclouds.cloudstack.domain.Zone;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;

/**
 * Templates can be present in a zone, and available, but not valid for launch
 * as their hypervisor isn't installed.
 * 
 * @author Adrian Cole
 */
@Singleton
public class CorrectHypervisorForZone implements Function<String, Predicate<Template>> {
    private final Supplier<Map<String, Set<String>>> hypervisorsSupplier;

    @Inject
    public CorrectHypervisorForZone(CloudStackClient client) {
        this(Suppliers.ofInstance(new CloudStackClientToZoneToHypervisors().apply(checkNotNull(client, "client"))));
    }

    public CorrectHypervisorForZone(Supplier<Map<String, Set<String>>> hypervisorsSupplier) {
        this.hypervisorsSupplier = checkNotNull(hypervisorsSupplier, "hypervisorsSupplier");
    }

    private static class CloudStackClientToZoneToHypervisors
            implements Function<CloudStackClient, Map<String, Set<String>>> {

        @Override
        public Map<String, Set<String>> apply(CloudStackClient client) {
            checkNotNull(client, "client");
            Builder<String, Set<String>> builder = ImmutableMap.builder();
            for (Zone zone : client.getZoneClient().listZones()) {
                builder.put(zone.getId(), client.getHypervisorClient().listHypervisorsInZone(zone.getId()));
            }
            return builder.build();
        }
    }

    @Override
    public Predicate<Template> apply(final String zoneId) {

        final Set<String> acceptableHypervisorsInZone;
        try {
            acceptableHypervisorsInZone = this.hypervisorsSupplier.get().get(zoneId);
        } catch (NullPointerException e) {
            throw new IllegalArgumentException("unknown zone: " + zoneId);
        }
        if (acceptableHypervisorsInZone.size() == 0)
            return Predicates.alwaysFalse();
        return new Predicate<Template>() {

            @Override
            public boolean apply(Template input) {
                return Predicates.in(acceptableHypervisorsInZone).apply(input.getHypervisor());
            }

            @Override
            public String toString() {
                return "hypervisorsInZone(" + zoneId + ", " + acceptableHypervisorsInZone + ")";
            }
        };
    }
}