feat(titus): preferSourceCapacity support (#2132)

orca-clouddriver/src/main/groovy/com/netflix/spinnaker/orca/clouddriver/pipeline/providers/titan/TitusDeployStagePreProcessor.groovy

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+/*
+ * Copyright 2018 Netflix, Inc.
+ *
+ * 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.netflix.spinnaker.orca.clouddriver.pipeline.providers.titan
+
+import com.netflix.spinnaker.orca.clouddriver.pipeline.providers.aws.ApplySourceServerGroupCapacityStage
+import com.netflix.spinnaker.orca.clouddriver.pipeline.providers.aws.CaptureSourceServerGroupCapacityTask
+import com.netflix.spinnaker.orca.clouddriver.pipeline.servergroup.strategies.DeployStagePreProcessor
+import com.netflix.spinnaker.orca.kato.pipeline.support.StageData
+import com.netflix.spinnaker.orca.pipeline.model.Stage
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.stereotype.Component
+
+@Component
+class TitusDeployStagePreProcessor implements DeployStagePreProcessor {
+  @Autowired
+  ApplySourceServerGroupCapacityStage applySourceServerGroupSnapshotStage
+
+  @Override
+  List<StepDefinition> additionalSteps(Stage stage) {
+    def stageData = stage.mapTo(StageData)
+    if (stageData.strategy == "rollingredblack") {
+      // rolling red/black has no need to snapshot capacities
+      return []
+    }
+
+    return [
+      new StepDefinition(
+        name: "snapshotSourceServerGroup",
+        taskClass: CaptureSourceServerGroupCapacityTask
+      )
+    ]
+  }
+
+  @Override
+  boolean supports(Stage stage) {
+    def stageData = stage.mapTo(StageData)
+    return stageData.cloudProvider == "titus" // && stageData.useSourceCapacity
+  }
+
+}