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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2020-2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2021 Nordix Foundation.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.lifecycle;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Predicate;
import lombok.Getter;
import lombok.NonNull;
import org.apache.commons.lang3.StringUtils;
import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.drools.domain.models.operational.OperationalPolicy;
import org.onap.policy.drools.system.PolicyController;
import org.onap.policy.models.tosca.authorative.concepts.ToscaConceptIdentifier;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Policy Type Drools Controller that delegates to a corresponding
* PolicyController that supports this policy type.
*/
public class PolicyTypeDroolsController implements PolicyTypeController {
protected static final ToscaConceptIdentifier compliantType =
new ToscaConceptIdentifier("onap.policies.controlloop.operational.common.Drools", "1.0.0");
private static final Logger logger = LoggerFactory.getLogger(PolicyTypeDroolsController.class);
@Getter
protected final Map<String, PolicyController> controllers = new ConcurrentHashMap<>();
@Getter
protected final ToscaConceptIdentifier policyType;
@GsonJsonIgnore
protected final LifecycleFsm fsm;
/**
* Creates a Policy Type Drools Controller.
*/
public PolicyTypeDroolsController(
ToscaConceptIdentifier policyType, LifecycleFsm fsm, PolicyController controller) {
this.policyType = policyType;
this.controllers.put(controller.getName(), controller);
this.fsm = fsm;
}
@Override
public boolean deploy(@NonNull ToscaPolicy policy) {
return perform(policy, controller -> {
if (!controller.getDrools().exists(policy)) {
return controller.offer(policy);
}
logger.warn("policy {} is not deployed into {} as it already exists",
policy.getIdentifier(), controller.getName());
// provided that the presence of the given policy is the
// desired final state of the operation, return success
return true;
});
}
/**
* Adds a controller to support this policy type.
*/
public void add(@NonNull PolicyController controller) {
if (!controller.getPolicyTypes().contains(this.policyType)) {
throw new IllegalArgumentException(
"controller " + controller.getName() + " does not support " + this.policyType);
}
controllers.put(controller.getName(), controller);
}
/**
* Removes a controller from this policy type.
*/
public void remove(@NonNull PolicyController controller) {
controllers.remove(controller.getName());
}
@Override
public boolean undeploy(@NonNull ToscaPolicy policy) {
return perform(policy, (PolicyController controller) -> {
if (controller.getDrools().exists(policy)) {
return controller.getDrools().delete(policy);
}
logger.warn("policy {} is not undeployed from {} as it does not exist",
policy.getIdentifier(), controller.getName());
// provided that the no presence of the policy is the
// desired final state of the operation, return success
return true;
});
}
/**
* Get all controllers that support the policy type.
*/
public List<PolicyController> controllers() {
return List.copyOf(controllers.values());
}
private List<PolicyController> controllers(String controllerName) {
if (StringUtils.isBlank(controllerName)) {
/* this policy applies to all controllers */
return controllers();
}
if (!this.controllers.containsKey(controllerName)) {
return List.of();
}
return List.of(this.controllers.get(controllerName));
}
private boolean perform(ToscaPolicy policy, Predicate<PolicyController> operation) {
try {
List<PolicyController> selected = selectControllers(policy);
var success = true;
for (PolicyController controller : selected) {
success = modifyController(operation, controller) && success;
}
return success && !selected.isEmpty();
} catch (CoderException e) {
logger.warn("perform: invalid formatted policy: {}", policy, e);
return false;
}
}
private boolean modifyController(Predicate<PolicyController> operation, PolicyController controller) {
try {
return operation.test(controller);
} catch (RuntimeException r) {
logger.warn("invalid operation {} applied to controller: {}", operation, controller);
return false;
}
}
private List<PolicyController> selectControllers(ToscaPolicy policy) throws CoderException {
if (compliantType.equals(policyType)) {
return controllers(
fsm.getDomainMaker().convertTo(policy, OperationalPolicy.class)
.getProperties()
.getControllerName());
}
return List.copyOf(controllers.values());
}
}
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