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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.policy.guard.builder.impl;
import java.util.LinkedList;
import org.openecomp.policy.controlloop.compiler.CompilerException;
import org.openecomp.policy.controlloop.compiler.ControlLoopCompilerCallback;
import org.openecomp.policy.controlloop.guard.compiler.ControlLoopGuardCompiler;
import org.openecomp.policy.controlloop.policy.builder.BuilderException;
import org.openecomp.policy.controlloop.policy.builder.MessageLevel;
import org.openecomp.policy.controlloop.policy.builder.Results;
import org.openecomp.policy.controlloop.policy.builder.impl.MessageImpl;
import org.openecomp.policy.controlloop.policy.builder.impl.ResultsImpl;
import org.openecomp.policy.controlloop.policy.guard.Constraint;
import org.openecomp.policy.controlloop.policy.guard.ControlLoopGuard;
import org.openecomp.policy.controlloop.policy.guard.Guard;
import org.openecomp.policy.controlloop.policy.guard.GuardPolicy;
import org.openecomp.policy.controlloop.policy.guard.builder.ControlLoopGuardBuilder;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.DumperOptions.FlowStyle;
import org.yaml.snakeyaml.Yaml;
public class ControlLoopGuardBuilderImpl implements ControlLoopGuardBuilder {
private ControlLoopGuard cLGuard;
public ControlLoopGuardBuilderImpl(Guard guard) {
cLGuard = new ControlLoopGuard();
cLGuard.setGuard(guard);
}
@Override
public ControlLoopGuardBuilder addGuardPolicy(GuardPolicy... policies) throws BuilderException {
if (policies == null) {
throw new BuilderException("GuardPolicy must not be null");
}
for (GuardPolicy policy : policies) {
if (!policy.isValid()) {
throw new BuilderException("Invalid guard policy - some required fields are missing");
}
if (cLGuard.getGuards() == null) {
cLGuard.setGuards(new LinkedList<>());
}
cLGuard.getGuards().add(policy);
}
return this;
}
@Override
public ControlLoopGuardBuilder removeGuardPolicy(GuardPolicy... policies) throws BuilderException {
if (policies == null) {
throw new BuilderException("GuardPolicy must not be null");
}
if (cLGuard.getGuards() == null) {
throw new BuilderException("No existing guard policies to remove");
}
for (GuardPolicy policy : policies) {
if (!policy.isValid()) {
throw new BuilderException("Invalid guard policy - some required fields are missing");
}
boolean removed = cLGuard.getGuards().remove(policy);
if (!removed) {
throw new BuilderException("Unknown guard policy: " + policy.getName());
}
}
return this;
}
@Override
public ControlLoopGuardBuilder removeAllGuardPolicies() throws BuilderException {
cLGuard.getGuards().clear();
return this;
}
@Override
public ControlLoopGuardBuilder addLimitConstraint(String id, Constraint... constraints) throws BuilderException {
if (id == null) {
throw new BuilderException("The id of target guard policy must not be null");
}
if (constraints == null) {
throw new BuilderException("Constraint much not be null");
}
if (!addLimitConstraints(id,constraints)) {
throw new BuilderException("No existing guard policy matching the id: " + id);
}
return this;
}
private boolean addLimitConstraints(String id, Constraint... constraints) throws BuilderException {
boolean exist = false;
for (GuardPolicy policy: cLGuard.getGuards()) {
//
// We could have only one guard policy matching the id
//
if (policy.getId().equals(id)) {
exist = true;
for (Constraint cons: constraints) {
if (!cons.isValid()) {
throw new BuilderException("Invalid guard constraint - some required fields are missing");
}
if (policy.getLimit_constraints() == null) {
policy.setLimit_constraints(new LinkedList<>());
}
policy.getLimit_constraints().add(cons);
}
break;
}
}
return exist;
}
@Override
public ControlLoopGuardBuilder removeLimitConstraint(String id, Constraint... constraints) throws BuilderException {
if (id == null) {
throw new BuilderException("The id of target guard policy must not be null");
}
if (constraints == null) {
throw new BuilderException("Constraint much not be null");
}
if (!removeConstraints(id, constraints)) {
throw new BuilderException("No existing guard policy matching the id: " + id);
}
return this;
}
private boolean removeConstraints(String id, Constraint... constraints) throws BuilderException {
boolean exist = false;
for (GuardPolicy policy: cLGuard.getGuards()) {
//
// We could have only one guard policy matching the id
//
if (policy.getId().equals(id)) {
exist = true;
for (Constraint cons: constraints) {
if (!cons.isValid()) {
throw new BuilderException("Invalid guard constraint - some required fields are missing");
}
boolean removed = policy.getLimit_constraints().remove(cons);
if (!removed) {
throw new BuilderException("Unknown guard constraint: " + cons);
}
}
break;
}
}
return exist;
}
@Override
public ControlLoopGuardBuilder removeAllLimitConstraints(String id) throws BuilderException {
if (cLGuard.getGuards() == null || cLGuard.getGuards().isEmpty()) {
throw new BuilderException("No guard policies exist");
}
if (id == null) {
throw new BuilderException("The id of target guard policy must not be null");
}
boolean exist = false;
for (GuardPolicy policy: cLGuard.getGuards()) {
if (policy.getId().equals(id)) {
exist = true;
policy.getLimit_constraints().clear();
}
}
if (!exist) {
throw new BuilderException("No existing guard policy matching the id: " + id);
}
return this;
}
private class BuilderCompilerCallback implements ControlLoopCompilerCallback {
private ResultsImpl results = new ResultsImpl();
@Override
public boolean onWarning(String message) {
results.addMessage(new MessageImpl(message, MessageLevel.WARNING));
return false;
}
@Override
public boolean onError(String message) {
results.addMessage(new MessageImpl(message, MessageLevel.ERROR));
return false;
}
}
@Override
public ControlLoopGuard getControlLoopGuard() {
return new ControlLoopGuard(this.cLGuard);
}
@Override
public Results buildSpecification() {
//
// Dump the specification
//
DumperOptions options = new DumperOptions();
options.setDefaultFlowStyle(FlowStyle.BLOCK);
options.setPrettyFlow(true);
Yaml yaml = new Yaml(options);
String dumpedYaml = yaml.dump(cLGuard);
//
// This is our callback class for our compiler
//
BuilderCompilerCallback callback = new BuilderCompilerCallback();
//
// Compile it
//
try {
ControlLoopGuardCompiler.compile(cLGuard, callback);
} catch (CompilerException e) {
callback.results.addMessage(new MessageImpl(e.getMessage(), MessageLevel.EXCEPTION));
}
//
// Save the spec
//
callback.results.setSpecification(dumpedYaml);
return callback.results;
}
}
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