org.jclouds.cache.CacheServerInstaller.java Source code

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Here is the source code for org.jclouds.cache.CacheServerInstaller.java

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/**
 * 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.cache;

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

import java.util.NoSuchElementException;
import java.util.Set;

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

import org.jclouds.compute.ComputeServiceContext;
import org.jclouds.compute.RunNodesException;
import org.jclouds.compute.domain.ComputeMetadata;
import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.domain.Template;
import org.jclouds.compute.reference.ComputeServiceConstants;
import org.jclouds.logging.Logger;
import org.jclouds.scriptbuilder.statements.login.AdminAccess;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Throwables;
import com.google.common.collect.Iterables;

/**
 * Installs all compatible cache repositories in a server with the provided template. If no server exists it is booted
 * up. All server scripts corresponding to all registered cache repositories are executed on the server.
 * 
 * @author David Alves
 * 
 */
@Singleton
public class CacheServerInstaller extends CacheInstaller implements Function<Template, Void> {

    @Inject
    public CacheServerInstaller(ComputeServiceContext ctx, Set<Cache> cacheRepos) {
        super(ctx, cacheRepos);
    }

    @Resource
    @Named(ComputeServiceConstants.COMPUTE_LOGGER)
    protected Logger logger = Logger.NULL;

    @VisibleForTesting
    public NodeMetadata cacheServer;

    @Override
    public Void apply(Template input) {
        try {
            cacheServer = getCacheServer(input);
        } catch (RunNodesException e) {
            throw Throwables.propagate(e);
        }
        for (Cache repo : cacheRepos) {
            logger.info("Installing cache repository server %s on node: %s", repo.getName(), cacheServer);
            if (repo.isServerCompatible(input.getImage())) {
                repo.installCacheServerInNode(ctx, cacheServer);
            }
        }
        return null;
    }

    private NodeMetadata getCacheServer(final Template template) throws RunNodesException {
        try {
            return Iterables.getOnlyElement(
                    ctx.getComputeService().listNodesDetailsMatching(new Predicate<ComputeMetadata>() {
                        @Override
                        public boolean apply(ComputeMetadata input) {
                            checkArgument(input instanceof NodeMetadata);
                            NodeMetadata node = (NodeMetadata) input;
                            return node.getGroup().startsWith(CACHE_SERVER_GROUP) && node.getGroup().endsWith(
                                    template.getImage().getOperatingSystem().getFamily().name().toLowerCase());
                        }
                    }));
        } catch (NoSuchElementException e) {
            logger.info("No cache server was found. Creating a new one [Template: %s ]", template);
            NodeMetadata node = Iterables.getOnlyElement(ctx.getComputeService().createNodesInGroup(
                    CACHE_SERVER_GROUP + "-"
                            + template.getImage().getOperatingSystem().getFamily().name().toLowerCase(),
                    1, template));
            logger.info("New cache server node created: %s ", node);
            ctx.getComputeService().runScriptOnNode(node.getId(), AdminAccess.standard());
            return node;
        } catch (IllegalArgumentException e) {
            throw new IllegalStateException("Found multiple cache servers!");
        }
    }
}