| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.tajo.rule; |
| |
| import java.util.*; |
| |
| public class SelfDiagnosisRuleEngine { |
| |
| private final Map<String, Map<String, RuleWrapper>> wrapperMap; |
| private static volatile SelfDiagnosisRuleEngine instance; |
| |
| private SelfDiagnosisRuleEngine() { |
| wrapperMap = new HashMap<>(); |
| loadPredefinedRules(); |
| } |
| |
| public static SelfDiagnosisRuleEngine getInstance() { |
| if (instance == null) { |
| synchronized (SelfDiagnosisRuleEngine.class) { |
| if (instance == null) { |
| instance = new SelfDiagnosisRuleEngine(); |
| } |
| } |
| } |
| return instance; |
| } |
| |
| public void reset() { |
| if (wrapperMap != null) { |
| wrapperMap.clear(); |
| } |
| loadPredefinedRules(); |
| } |
| |
| public SelfDiagnosisRuleSession newRuleSession() { |
| return new SelfDiagnosisRuleSession(this); |
| } |
| |
| protected Map<String, Map<String, RuleWrapper>> getRules() { |
| return wrapperMap; |
| } |
| |
| private void loadRuleData(List<SelfDiagnosisRule> ruleList) { |
| for (SelfDiagnosisRule rule: ruleList) { |
| RuleWrapper wrapper = new RuleWrapper(rule); |
| if (wrapper.isEnabled()) { |
| Map<String, RuleWrapper> categoryMap = wrapperMap.get(wrapper.getCategoryName()); |
| |
| if (categoryMap == null) { |
| categoryMap = new HashMap<>(); |
| wrapperMap.put(wrapper.getCategoryName(), categoryMap); |
| } |
| |
| categoryMap.put(wrapper.getRuleName(), wrapper); |
| } |
| } |
| } |
| |
| protected void loadPredefinedRules() { |
| ClassLoader cl = Thread.currentThread().getContextClassLoader(); |
| ServiceLoader<SelfDiagnosisRuleProvider> serviceLoader = ServiceLoader.load(SelfDiagnosisRuleProvider.class, cl); |
| Iterator<SelfDiagnosisRuleProvider> iterator = serviceLoader.iterator(); |
| |
| wrapperMap.clear(); |
| while (iterator.hasNext()) { |
| SelfDiagnosisRuleProvider ruleProvider = iterator.next(); |
| loadRuleData(ruleProvider.getDefinedRules()); |
| } |
| } |
| |
| static class RuleWrapper implements Comparable<RuleWrapper> { |
| private final String categoryName; |
| private final String ruleName; |
| private final int priority; |
| private final boolean enabled; |
| private final Class<?>[] acceptedCallers; |
| private final SelfDiagnosisRule rule; |
| |
| public RuleWrapper(SelfDiagnosisRule rule) { |
| this.rule = rule; |
| |
| SelfDiagnosisRuleDefinition ruleDefinition = rule.getClass().getAnnotation(SelfDiagnosisRuleDefinition.class); |
| if (ruleDefinition == null) { |
| throw new IllegalArgumentException(rule.getClass().getName() + " is not a valid runtime rule."); |
| } |
| categoryName = ruleDefinition.category(); |
| ruleName = ruleDefinition.name(); |
| priority = ruleDefinition.priority(); |
| enabled = ruleDefinition.enabled(); |
| |
| SelfDiagnosisRuleVisibility.LimitedPrivate limitedPrivateScope = |
| rule.getClass().getAnnotation(SelfDiagnosisRuleVisibility.LimitedPrivate.class); |
| if (limitedPrivateScope != null) { |
| acceptedCallers = |
| Arrays.copyOf(limitedPrivateScope.acceptedCallers(), |
| limitedPrivateScope.acceptedCallers().length); |
| } else { |
| acceptedCallers = new Class<?>[0]; |
| } |
| } |
| |
| public String getCategoryName() { |
| return categoryName; |
| } |
| |
| public String getRuleName() { |
| return ruleName; |
| } |
| |
| public Class<?>[] getAcceptedCallers() { |
| return acceptedCallers; |
| } |
| |
| public SelfDiagnosisRule getRule() { |
| return rule; |
| } |
| |
| public int getPriority() { |
| return priority; |
| } |
| |
| public boolean isEnabled() { |
| return enabled; |
| } |
| |
| @Override |
| public int compareTo(RuleWrapper o) { |
| if (getPriority() < 0 && o.getPriority() < 0) { |
| return 0; |
| } else if (getPriority() < 0) { |
| return 1; |
| } else if (o.getPriority() < 0) { |
| return -1; |
| } |
| return (int) Math.signum(getPriority() - o.getPriority()); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + Arrays.hashCode(acceptedCallers); |
| result = prime * result + ((categoryName == null) ? 0 : categoryName.hashCode()); |
| result = prime * result + (enabled ? 1231 : 1237); |
| result = prime * result + priority; |
| result = prime * result + ((rule == null) ? 0 : rule.hashCode()); |
| result = prime * result + ((ruleName == null) ? 0 : ruleName.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| RuleWrapper other = (RuleWrapper) obj; |
| if (!Arrays.equals(acceptedCallers, other.acceptedCallers)) |
| return false; |
| if (categoryName == null) { |
| if (other.categoryName != null) |
| return false; |
| } else if (!categoryName.equals(other.categoryName)) |
| return false; |
| if (enabled != other.enabled) |
| return false; |
| if (priority != other.priority) |
| return false; |
| if (rule == null) { |
| if (other.rule != null) |
| return false; |
| } else if (!rule.equals(other.rule)) |
| return false; |
| if (ruleName == null) { |
| if (other.ruleName != null) |
| return false; |
| } else if (!ruleName.equals(other.ruleName)) |
| return false; |
| return true; |
| } |
| |
| } |
| |
| } |