/*
* Copyright (c) 2012 S.C. Axemblr Software Solutions S.R.L
*
* 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 com.axemblr.provisionr.amazon.activities;
import java.util.List;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.Instance;
import com.amazonaws.services.ec2.model.Reservation;
import com.axemblr.provisionr.amazon.core.ProviderClientCache;
import com.axemblr.provisionr.api.pool.Pool;
import com.axemblr.provisionr.core.CoreProcessVariables;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import static com.google.common.base.Preconditions.checkNotNull;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.JavaDelegate;
public abstract class AmazonActivity implements JavaDelegate {
private final ProviderClientCache providerClientCache;
protected AmazonActivity(ProviderClientCache providerClientCache) {
this.providerClientCache = checkNotNull(providerClientCache, "providerClientCache is null");
}
/**
* Amazon specific activity implementation
*
* @param client Amazon client created using the pool provider
* @param pool Virtual machines pool description
* @param execution Activiti execution context
*/
public abstract void execute(AmazonEC2 client, Pool pool, DelegateExecution execution) throws Exception;
/**
* Wrap the abstract {@code execute} method with the logic that knows how to create the Amazon client
*/
@Override
public void execute(DelegateExecution execution) throws Exception {
Pool pool = (Pool) execution.getVariable(CoreProcessVariables.POOL);
checkNotNull(pool, "Please add the pool description as a process " +
"variable with the name '%s'.", CoreProcessVariables.POOL);
execute(providerClientCache.getUnchecked(pool.getProvider()), pool, execution);
}
protected List<Instance> collectInstancesFromReservations(List<Reservation> reservation) {
/* Make a copy as an ArrayList to force lazy collection evaluation */
List<List<Instance>> allInstances = Lists.transform(reservation, new Function<Reservation, List<Instance>>() {
@Override
public List<Instance> apply(Reservation reservation) {
return reservation.getInstances();
}
});
return Lists.newArrayList(Iterables.concat(allInstances));
}
}