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前言

ConsumerFilterManager 继承了ConfigManager配置管理组件，拥有将内存数据持久化到磁盘文件consumerFilter.json的能力。它主要负责，对在消费者拉取消息时，进行消息数据过滤，且只针对使用表达式过滤的消费者有效。

源码版本：4.9.3

源码架构图

核心数据结构

可以看到内存中维护了 topic -> consumer group -> ConsumerFilterData 映射关系的数据结构。

/*** Consumer filter data manager.Just manage the consumers use expression filter.* 消费者过滤数据管理组件。只管理使用表达式过滤的消费者。*/
public class ConsumerFilterManager extends ConfigManager {// 核心数据结构：topic -> consumer group -> ConsumerFilterDataprivate ConcurrentMap<String/*Topic*/, FilterDataMapByTopic>filterDataByTopic = new ConcurrentHashMap<String/*Topic*/, FilterDataMapByTopic>(256);private transient BrokerController brokerController;// 布隆过滤器private transient BloomFilter bloomFilter;
}

深入看下 FilterDataMapByTopic 类，是上面数据结构的一个子集，维护了 消费组 -> 消费组过滤数据映射关系。

    public static class FilterDataMapByTopic {// 核心数据结构：consumer group -> ConsumerFilterDataprivate ConcurrentMap<String/*consumer group*/, ConsumerFilterData>groupFilterData = new ConcurrentHashMap<String, ConsumerFilterData>();private String topic;}

在深入一步，看下 ConsumerFilterData 的数据结构，包含了全部与消费者过滤有关的关键信息。

/*** Filter data of consumer.*/
public class ConsumerFilterData {// 消费组private String consumerGroup;// 主题private String topic;// 过滤器表达式private String expression;// 过滤器类型private String expressionType;// 过滤器编译后的表达式private transient Expression compiledExpression;// 过滤器创建时间private long bornTime;// 过滤器过期时间private long deadTime = 0;// 过滤器版本private long version;// 布隆过滤器数据private BloomFilterData bloomFilterData;// 客户端版本private long clientVersion;
}

核心数据行为

从下面代码可以看到，ConsumerFilterManager的行为主要是注册订阅、取消订阅、清理过期订阅、序列化、反序列化等维护内存元数据的行为。过滤行为不在这个组件里体现，在其他调用方法中会有具体使用方式。

/*** Consumer filter data manager.Just manage the consumers use expression filter.* 消费者过滤数据管理组件。只管理使用表达式过滤的消费者。*/
public class ConsumerFilterManager extends ConfigManager {private static final InternalLogger log = InternalLoggerFactory.getLogger(LoggerName.FILTER_LOGGER_NAME);private static final long MS_24_HOUR = 24 * 3600 * 1000;// 核心数据结构：topic -> consumer group -> ConsumerFilterDataprivate ConcurrentMap<String/*Topic*/, FilterDataMapByTopic>filterDataByTopic = new ConcurrentHashMap<String/*Topic*/, FilterDataMapByTopic>(256);private transient BrokerController brokerController;// 布隆过滤器private transient BloomFilter bloomFilter;public ConsumerFilterManager() {// just for testthis.bloomFilter = BloomFilter.createByFn(20, 64);}public ConsumerFilterManager(BrokerController brokerController) {this.brokerController = brokerController;this.bloomFilter = BloomFilter.createByFn(brokerController.getBrokerConfig().getMaxErrorRateOfBloomFilter(),brokerController.getBrokerConfig().getExpectConsumerNumUseFilter());// then set bit map length of store config.brokerController.getMessageStoreConfig().setBitMapLengthConsumeQueueExt(this.bloomFilter.getM());}/*** Build consumer filter data.Be care, bloom filter data is not included.** @return maybe null*/public static ConsumerFilterData build(final String topic, final String consumerGroup,final String expression, final String type,final long clientVersion) {if (ExpressionType.isTagType(type)) {return null;}ConsumerFilterData consumerFilterData = new ConsumerFilterData();consumerFilterData.setTopic(topic);consumerFilterData.setConsumerGroup(consumerGroup);consumerFilterData.setBornTime(System.currentTimeMillis());consumerFilterData.setDeadTime(0);consumerFilterData.setExpression(expression);consumerFilterData.setExpressionType(type);consumerFilterData.setClientVersion(clientVersion);try {consumerFilterData.setCompiledExpression(FilterFactory.INSTANCE.get(type).compile(expression));} catch (Throwable e) {log.error("parse error: expr={}, topic={}, group={}, error={}", expression, topic, consumerGroup, e.getMessage());return null;}return consumerFilterData;}/*** 在指定消费组注册消费者过滤数据* @param consumerGroup* @param subList*/public void register(final String consumerGroup, final Collection<SubscriptionData> subList) {for (SubscriptionData subscriptionData : subList) {register(subscriptionData.getTopic(),consumerGroup,subscriptionData.getSubString(),subscriptionData.getExpressionType(),subscriptionData.getSubVersion());}// make illegal topic dead.Collection<ConsumerFilterData> groupFilterData = getByGroup(consumerGroup);Iterator<ConsumerFilterData> iterator = groupFilterData.iterator();while (iterator.hasNext()) {ConsumerFilterData filterData = iterator.next();boolean exist = false;for (SubscriptionData subscriptionData : subList) {if (subscriptionData.getTopic().equals(filterData.getTopic())) {exist = true;break;}}if (!exist && !filterData.isDead()) {filterData.setDeadTime(System.currentTimeMillis());log.info("Consumer filter changed: {}, make illegal topic dead:{}", consumerGroup, filterData);}}}public boolean register(final String topic, final String consumerGroup, final String expression,final String type, final long clientVersion) {// 不支持tag类型if (ExpressionType.isTagType(type)) {return false;}if (expression == null || expression.length() == 0) {return false;}// 获取topic对应的消费者过滤数据FilterDataMapByTopic filterDataMapByTopic = this.filterDataByTopic.get(topic);if (filterDataMapByTopic == null) {FilterDataMapByTopic temp = new FilterDataMapByTopic(topic);FilterDataMapByTopic prev = this.filterDataByTopic.putIfAbsent(topic, temp);filterDataMapByTopic = prev != null ? prev : temp;}// 创建布隆过滤器数据BloomFilterData bloomFilterData = bloomFilter.generate(consumerGroup + "#" + topic);// 注册过滤数据到topicreturn filterDataMapByTopic.register(consumerGroup, expression, type, bloomFilterData, clientVersion);}// 取消注册消费者过滤数据public void unRegister(final String consumerGroup) {for (Entry<String, FilterDataMapByTopic> entry : filterDataByTopic.entrySet()) {entry.getValue().unRegister(consumerGroup);}}public ConsumerFilterData get(final String topic, final String consumerGroup) {if (!this.filterDataByTopic.containsKey(topic)) {return null;}if (this.filterDataByTopic.get(topic).getGroupFilterData().isEmpty()) {return null;}return this.filterDataByTopic.get(topic).getGroupFilterData().get(consumerGroup);}// 获取消费组下所有过滤数据public Collection<ConsumerFilterData> getByGroup(final String consumerGroup) {Collection<ConsumerFilterData> ret = new HashSet<ConsumerFilterData>();Iterator<FilterDataMapByTopic> topicIterator = this.filterDataByTopic.values().iterator();while (topicIterator.hasNext()) {FilterDataMapByTopic filterDataMapByTopic = topicIterator.next();Iterator<ConsumerFilterData> filterDataIterator = filterDataMapByTopic.getGroupFilterData().values().iterator();while (filterDataIterator.hasNext()) {ConsumerFilterData filterData = filterDataIterator.next();if (filterData.getConsumerGroup().equals(consumerGroup)) {ret.add(filterData);}}}return ret;}// 获取topic下所有过滤数据public final Collection<ConsumerFilterData> get(final String topic) {if (!this.filterDataByTopic.containsKey(topic)) {return null;}if (this.filterDataByTopic.get(topic).getGroupFilterData().isEmpty()) {return null;}return this.filterDataByTopic.get(topic).getGroupFilterData().values();}public BloomFilter getBloomFilter() {return bloomFilter;}@Overridepublic String encode() {return encode(false);}@Overridepublic String configFilePath() {if (this.brokerController != null) {// 配置存储路径 config/consumerFilter.jsonreturn BrokerPathConfigHelper.getConsumerFilterPath(this.brokerController.getMessageStoreConfig().getStorePathRootDir());}return BrokerPathConfigHelper.getConsumerFilterPath("./unit_test");}// 将json字符串反序列化为ConsumerFilterManager对象@Overridepublic void decode(final String jsonString) {ConsumerFilterManager load = RemotingSerializable.fromJson(jsonString, ConsumerFilterManager.class);if (load != null && load.filterDataByTopic != null) {boolean bloomChanged = false;for (Entry<String, FilterDataMapByTopic> entry : load.filterDataByTopic.entrySet()) {FilterDataMapByTopic dataMapByTopic = entry.getValue();if (dataMapByTopic == null) {continue;}for (Entry<String, ConsumerFilterData> groupEntry : dataMapByTopic.getGroupFilterData().entrySet()) {ConsumerFilterData filterData = groupEntry.getValue();if (filterData == null) {continue;}try {filterData.setCompiledExpression(FilterFactory.INSTANCE.get(filterData.getExpressionType()).compile(filterData.getExpression()));} catch (Exception e) {log.error("load filter data error, " + filterData, e);}// check whether bloom filter is changed// if changed, ignore the bit map calculated before.if (!this.bloomFilter.isValid(filterData.getBloomFilterData())) {bloomChanged = true;log.info("Bloom filter is changed!So ignore all filter data persisted! {}, {}", this.bloomFilter, filterData.getBloomFilterData());break;}log.info("load exist consumer filter data: {}", filterData);if (filterData.getDeadTime() == 0) {// we think all consumers are dead when loadlong deadTime = System.currentTimeMillis() - 30 * 1000;filterData.setDeadTime(deadTime <= filterData.getBornTime() ? filterData.getBornTime() : deadTime);}}}if (!bloomChanged) {this.filterDataByTopic = load.filterDataByTopic;}}}// 将ConsumerFilterManager对象序列化为json字符串@Overridepublic String encode(final boolean prettyFormat) {// clean{clean();}return RemotingSerializable.toJson(this, prettyFormat);}// 清理过期的过滤数据public void clean() {Iterator<Map.Entry<String, FilterDataMapByTopic>> topicIterator = this.filterDataByTopic.entrySet().iterator();while (topicIterator.hasNext()) {Map.Entry<String, FilterDataMapByTopic> filterDataMapByTopic = topicIterator.next();Iterator<Map.Entry<String, ConsumerFilterData>> filterDataIterator= filterDataMapByTopic.getValue().getGroupFilterData().entrySet().iterator();while (filterDataIterator.hasNext()) {Map.Entry<String, ConsumerFilterData> filterDataByGroup = filterDataIterator.next();ConsumerFilterData filterData = filterDataByGroup.getValue();if (filterData.howLongAfterDeath() >= (this.brokerController == null ? MS_24_HOUR : this.brokerController.getBrokerConfig().getFilterDataCleanTimeSpan())) {log.info("Remove filter consumer {}, died too long!", filterDataByGroup.getValue());filterDataIterator.remove();}}if (filterDataMapByTopic.getValue().getGroupFilterData().isEmpty()) {log.info("Topic has no consumer, remove it! {}", filterDataMapByTopic.getKey());topicIterator.remove();}}}public ConcurrentMap<String, FilterDataMapByTopic> getFilterDataByTopic() {return filterDataByTopic;}public void setFilterDataByTopic(final ConcurrentHashMap<String, FilterDataMapByTopic> filterDataByTopic) {this.filterDataByTopic = filterDataByTopic;}public static class FilterDataMapByTopic {// 核心数据结构：consumer group -> ConsumerFilterDataprivate ConcurrentMap<String/*consumer group*/, ConsumerFilterData>groupFilterData = new ConcurrentHashMap<String, ConsumerFilterData>();private String topic;public FilterDataMapByTopic() {}public FilterDataMapByTopic(String topic) {this.topic = topic;}// 取消注册某个消费组的过滤器public void unRegister(String consumerGroup) {if (!this.groupFilterData.containsKey(consumerGroup)) {return;}ConsumerFilterData data = this.groupFilterData.get(consumerGroup);if (data == null || data.isDead()) {return;}long now = System.currentTimeMillis();log.info("Unregister consumer filter: {}, deadTime: {}", data, now);data.setDeadTime(now);}public boolean register(String consumerGroup, String expression, String type, BloomFilterData bloomFilterData,long clientVersion) {ConsumerFilterData old = this.groupFilterData.get(consumerGroup);if (old == null) {// 构建过滤器数据ConsumerFilterData consumerFilterData = build(topic, consumerGroup, expression, type, clientVersion);if (consumerFilterData == null) {return false;}// 设置布隆过滤器consumerFilterData.setBloomFilterData(bloomFilterData);// 放入内存数据结构old = this.groupFilterData.putIfAbsent(consumerGroup, consumerFilterData);if (old == null) {log.info("New consumer filter registered: {}", consumerFilterData);return true;} else {if (clientVersion <= old.getClientVersion()) {if (!type.equals(old.getExpressionType()) || !expression.equals(old.getExpression())) {log.warn("Ignore consumer({} : {}) filter(concurrent), because of version {} <= {}, but maybe info changed!old={}:{}, ignored={}:{}",consumerGroup, topic,clientVersion, old.getClientVersion(),old.getExpressionType(), old.getExpression(),type, expression);}if (clientVersion == old.getClientVersion() && old.isDead()) {reAlive(old);return true;}return false;} else {this.groupFilterData.put(consumerGroup, consumerFilterData);log.info("New consumer filter registered(concurrent): {}, old: {}", consumerFilterData, old);return true;}}} else {// 当前版本号小于旧的版本号if (clientVersion <= old.getClientVersion()) {if (!type.equals(old.getExpressionType()) || !expression.equals(old.getExpression())) {log.info("Ignore consumer({}:{}) filter, because of version {} <= {}, but maybe info changed!old={}:{}, ignored={}:{}",consumerGroup, topic,clientVersion, old.getClientVersion(),old.getExpressionType(), old.getExpression(),type, expression);}if (clientVersion == old.getClientVersion() && old.isDead()) {reAlive(old);return true;}return false;}// 新版本号大于旧的版本号boolean change = !old.getExpression().equals(expression) || !old.getExpressionType().equals(type);if (old.getBloomFilterData() == null && bloomFilterData != null) {change = true;}if (old.getBloomFilterData() != null && !old.getBloomFilterData().equals(bloomFilterData)) {change = true;}// if subscribe data is changed, or consumer is died too long.if (change) {// 构建过滤器数据ConsumerFilterData consumerFilterData = build(topic, consumerGroup, expression, type, clientVersion);if (consumerFilterData == null) {// new expression compile error, remove old, let client report error.this.groupFilterData.remove(consumerGroup);return false;}consumerFilterData.setBloomFilterData(bloomFilterData);// 设置过滤器数据this.groupFilterData.put(consumerGroup, consumerFilterData);log.info("Consumer filter info change, old: {}, new: {}, change: {}",old, consumerFilterData, change);return true;} else {// 版本号一致，更新过滤器数据old.setClientVersion(clientVersion);if (old.isDead()) {reAlive(old);}return true;}}}protected void reAlive(ConsumerFilterData filterData) {long oldDeadTime = filterData.getDeadTime();filterData.setDeadTime(0);log.info("Re alive consumer filter: {}, oldDeadTime: {}", filterData, oldDeadTime);}public final ConsumerFilterData get(String consumerGroup) {return this.groupFilterData.get(consumerGroup);}public final ConcurrentMap<String, ConsumerFilterData> getGroupFilterData() {return this.groupFilterData;}public void setGroupFilterData(final ConcurrentHashMap<String, ConsumerFilterData> groupFilterData) {this.groupFilterData = groupFilterData;}public String getTopic() {return topic;}public void setTopic(final String topic) {this.topic = topic;}}
}