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/*-
* ============LICENSE_START=======================================================
* ECOMP Policy Engine
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.openecomp.policy.controlloop.guard.compiler;
import java.io.InputStream;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.openecomp.policy.controlloop.compiler.CompilerException;
import org.openecomp.policy.controlloop.compiler.ControlLoopCompilerCallback;
import org.openecomp.policy.controlloop.policy.guard.Constraint;
import org.openecomp.policy.controlloop.policy.guard.ControlLoopGuard;
import org.openecomp.policy.controlloop.policy.guard.GuardPolicy;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
public class ControlLoopGuardCompiler {
private ControlLoopGuardCompiler(){
// Private Constructor
}
public static ControlLoopGuard compile(ControlLoopGuard cLGuard, ControlLoopCompilerCallback callback) throws CompilerException {
//
// Ensure ControlLoopGuard has at least one guard policies
//
validateControlLoopGuard(cLGuard, callback);
//
// Ensure each guard policy has at least one constraints and all guard policies are unique
//
validateGuardPolicies(cLGuard.getGuards(), callback);
//
// Ensure constraints for each guard policy are unique
//
validateConstraints(cLGuard.getGuards(), callback);
return cLGuard;
}
public static ControlLoopGuard compile(InputStream yamlSpecification, ControlLoopCompilerCallback callback) throws CompilerException {
Yaml yaml = new Yaml(new Constructor(ControlLoopGuard.class));
Object obj = yaml.load(yamlSpecification);
if (obj == null) {
throw new CompilerException("Could not parse yaml specification.");
}
if (! (obj instanceof ControlLoopGuard)) {
throw new CompilerException("Yaml could not parse specification into required ControlLoopGuard object");
}
return ControlLoopGuardCompiler.compile((ControlLoopGuard) obj, callback);
}
private static void validateControlLoopGuard(ControlLoopGuard cLGuard, ControlLoopCompilerCallback callback) throws CompilerException {
if (cLGuard == null) {
if (callback != null) {
callback.onError("ControlLoop Guard cannot be null");
}
throw new CompilerException("ControlLoop Guard cannot be null");
}
if (cLGuard.getGuard() == null && callback != null) {
callback.onError("Guard version cannot be null");
}
if (cLGuard.getGuards() == null) {
if (callback != null) {
callback.onError("ControlLoop Guard should have at least one guard policies");
}
} else if (cLGuard.getGuards().isEmpty() && callback != null) {
callback.onError("ControlLoop Guard should have at least one guard policies");
}
}
private static void validateGuardPolicies(List<GuardPolicy> policies, ControlLoopCompilerCallback callback) throws CompilerException {
if (policies == null) {
if (callback != null) {
callback.onError("Guard policies should not be null");
}
throw new CompilerException("Guard policies should not be null");
}
//
// Ensure all guard policies are unique
//
Set<GuardPolicy> newSet = new HashSet<>(policies);
if (newSet.size() != policies.size() && callback != null) {
callback.onWarning("There are duplicate guard policies");
}
//
// Ensure each guard policy has at least one constraints
//
for (GuardPolicy policy : policies) {
if (policy.getLimit_constraints() == null || policy.getLimit_constraints().isEmpty()) {
if (callback != null) {
callback.onError("Guard policy " + policy.getName() + " does not have any limit constraint");
}
throw new CompilerException("Guard policy " + policy.getName() + " does not have any limit constraint");
}
}
}
private static void validateConstraints(List<GuardPolicy> policies, ControlLoopCompilerCallback callback) throws CompilerException {
if (policies == null) {
if (callback != null) {
callback.onError("Guard policies should not be null");
}
throw new CompilerException("Guard policies should not be null");
}
for (GuardPolicy policy : policies) {
Set<Constraint> newSet = new HashSet<>(policy.getLimit_constraints());
if (newSet.size() != policy.getLimit_constraints().size() && callback != null) {
callback.onWarning("Guard policy " + policy.getName() + " has duplicate limit constraints");
}
}
}
}
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