org.jclouds.loadbalancer.config.BaseLoadBalancerServiceContextModule.java Source code

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Here is the source code for org.jclouds.loadbalancer.config.BaseLoadBalancerServiceContextModule.java

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * 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 org.jclouds.loadbalancer.config;

import static org.jclouds.Constants.PROPERTY_SESSION_INTERVAL;

import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.collect.Memoized;
import org.jclouds.domain.Location;
import org.jclouds.rest.AuthorizationException;
import org.jclouds.rest.suppliers.MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier;

import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.Maps;
import com.google.inject.AbstractModule;
import com.google.inject.Provides;

/**
 * 
 * @author Adrian Cole
 */
public abstract class BaseLoadBalancerServiceContextModule extends AbstractModule {

    protected AtomicReference<AuthorizationException> authException = new AtomicReference<AuthorizationException>();

    @Override
    protected void configure() {

    }

    @Provides
    @Singleton
    protected Supplier<Map<String, ? extends Location>> provideLocationMap(
            @Memoized Supplier<Set<? extends Location>> locations) {
        return Suppliers.compose(new Function<Set<? extends Location>, Map<String, ? extends Location>>() {

            @Override
            public Map<String, ? extends Location> apply(Set<? extends Location> from) {
                return Maps.uniqueIndex(from, new Function<Location, String>() {

                    @Override
                    public String apply(Location from) {
                        return from.getId();
                    }

                });
            }

        }, locations);
    }

    @Provides
    @Singleton
    @Memoized
    protected Supplier<Set<? extends Location>> supplyLocationCache(@Named(PROPERTY_SESSION_INTERVAL) long seconds,
            final Supplier<Set<? extends Location>> locationSupplier) {
        return new MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<Set<? extends Location>>(
                authException, seconds, new Supplier<Set<? extends Location>>() {
                    @Override
                    public Set<? extends Location> get() {
                        return locationSupplier.get();
                    }
                });
    }

}