gerrit.onap Code Review - policy/drools-applications.git/blob

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * controlloop processor
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.onap.policy.controlloop.processor;
  22
  23 import org.onap.policy.controlloop.ControlLoopException;
  24 import org.onap.policy.controlloop.policy.ControlLoop;
  25 import org.onap.policy.controlloop.policy.ControlLoopPolicy;
  26 import org.onap.policy.controlloop.policy.FinalResult;
  27 import org.onap.policy.controlloop.policy.Policy;
  28 import org.onap.policy.controlloop.policy.PolicyResult;
  29 import org.yaml.snakeyaml.Yaml;
  30 import org.yaml.snakeyaml.constructor.CustomClassLoaderConstructor;
  31
  32 public class ControlLoopProcessor {
  33
  34         private final String yaml;
  35         private final ControlLoopPolicy policy;
  36         private String currentNestedPolicyID = null;
  37
  38         public ControlLoopProcessor(String yaml) throws ControlLoopException {
  39                 this.yaml = yaml;
  40                 try {
  41                         final Yaml y = new Yaml(new CustomClassLoaderConstructor(ControlLoopPolicy.class,       ControlLoopPolicy.class.getClassLoader()));
  42                         final Object obj = y.load(this.yaml);
  43
  44                         this.policy = (ControlLoopPolicy) obj;
  45                         this.currentNestedPolicyID = this.policy.getControlLoop().getTrigger_policy();
  46                 } catch (final Exception e) {
  47                         //
  48                         // Most likely this is a YAML Exception
  49                         //
  50                         throw new ControlLoopException(e);
  51                 }
  52         }
  53
  54         public ControlLoop getControlLoop() {
  55                 return this.policy.getControlLoop();
  56         }
  57
  58         public FinalResult checkIsCurrentPolicyFinal() {
  59                 return FinalResult.toResult(this.currentNestedPolicyID);
  60         }
  61
  62         public Policy getCurrentPolicy() throws ControlLoopException {
  63                 if (this.policy == null || this.policy.getPolicies() == null) {
  64                         throw new ControlLoopException("There are no policies defined.");
  65                 }
  66
  67                 for (final Policy nestedPolicy : this.policy.getPolicies()) {
  68                         if (nestedPolicy.getId().equals(this.currentNestedPolicyID)) {
  69                                 return nestedPolicy;
  70                         }
  71                 }
  72                 return null;
  73         }
  74
  75         public void nextPolicyForResult(PolicyResult result) throws ControlLoopException {
  76                 final Policy currentPolicy = this.getCurrentPolicy();
  77                 try {
  78                         if (currentPolicy == null) {
  79                                 throw new ControlLoopException("There is no current policy to determine where to go to.");
  80                         }
  81                         switch (result) {
  82                         case SUCCESS:
  83                                 this.currentNestedPolicyID = currentPolicy.getSuccess();
  84                                 break;
  85                         case FAILURE:
  86                                 this.currentNestedPolicyID = currentPolicy.getFailure();
  87                                 break;
  88                         case FAILURE_TIMEOUT:
  89                                 this.currentNestedPolicyID = currentPolicy.getFailure_timeout();
  90                                 break;
  91                         case FAILURE_RETRIES:
  92                                 this.currentNestedPolicyID = currentPolicy.getFailure_retries();
  93                                 break;
  94                         case FAILURE_EXCEPTION:
  95                                 this.currentNestedPolicyID = currentPolicy.getFailure_exception();
  96                                 break;
  97                         case FAILURE_GUARD:
  98                                 this.currentNestedPolicyID = currentPolicy.getFailure_guard();
  99                                 break;
 100                         }
 101                 } catch (final ControlLoopException e) {
 102                         this.currentNestedPolicyID = FinalResult.FINAL_FAILURE_EXCEPTION.toString();
 103                         throw e;
 104                 }
 105         }
 106 }