RunOnDemandInstances.java

/*
 * 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.activities;

import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.Instance;
import com.amazonaws.services.ec2.model.RunInstancesRequest;
import com.amazonaws.services.ec2.model.RunInstancesResult;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import java.io.IOException;
import java.util.List;
import org.activiti.engine.delegate.DelegateExecution;
import org.apache.provisionr.amazon.ProcessVariables;
import org.apache.provisionr.amazon.core.ProviderClientCache;
import org.apache.provisionr.api.pool.Pool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RunOnDemandInstances extends RunInstances {

    private static final Logger LOG = LoggerFactory.getLogger(RunOnDemandInstances.class);

    public RunOnDemandInstances(ProviderClientCache cache) {
        super(cache);
    }

    @Override
    public void execute(AmazonEC2 client, Pool pool, DelegateExecution execution) throws IOException {

        final RunInstancesRequest request = createOnDemandInstancesRequest(pool, execution);
        // TODO allow for more options (e.g. monitoring & termination protection etc.)

        LOG.info(">> Sending RunInstances request: {}", request);
        RunInstancesResult result = client.runInstances(request);
        LOG.info("<< Got RunInstances result: {}", result);

        // TODO tag instances: managed-by: Apache Provisionr, business-key: ID etc.

        execution.setVariable(ProcessVariables.RESERVATION_ID,
            result.getReservation().getReservationId());
        execution.setVariable(ProcessVariables.INSTANCE_IDS,
            collectInstanceIdsAsList(result.getReservation().getInstances()));
    }


    private List<String> collectInstanceIdsAsList(List<Instance> instances) {
        /* Make a copy as an ArrayList to force lazy collection evaluation */
        return Lists.newArrayList(Lists.transform(instances,
            new Function<Instance, String>() {
                @Override
                public String apply(Instance instance) {
                    return instance.getInstanceId();
                }
            }));
    }
}