/* * 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)); } }