org.enodeframework.eventing.impl.DefaultEventCommittingService.kt Maven / Gradle / Ivy
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The enodeframework core implementation.
package org.enodeframework.eventing.impl
import org.enodeframework.commanding.CommandResult
import org.enodeframework.commanding.CommandStatus
import org.enodeframework.commanding.ProcessingCommand
import org.enodeframework.common.exception.MailBoxInvalidException
import org.enodeframework.common.io.IOHelper
import org.enodeframework.common.serializing.ISerializeService
import org.enodeframework.domain.IAggregateRoot
import org.enodeframework.domain.IMemoryCache
import org.enodeframework.eventing.*
import org.enodeframework.messaging.IMessagePublisher
import org.slf4j.LoggerFactory
import java.util.*
import java.util.concurrent.CompletableFuture
import java.util.concurrent.Executor
import java.util.stream.Collectors
/**
* @author [email protected]
*/
class DefaultEventCommittingService(private val memoryCache: IMemoryCache, private val eventStore: IEventStore, private val serializeService: ISerializeService, private val domainEventPublisher: IMessagePublisher, private val eventMailBoxCount: Int, private val executor: Executor?) : IEventCommittingService {
private val eventCommittingContextMailBoxList: MutableList
constructor(memoryCache: IMemoryCache, eventStore: IEventStore, serializeService: ISerializeService, domainEventPublisher: IMessagePublisher, executor: Executor?) : this(memoryCache, eventStore, serializeService, domainEventPublisher, 4, executor) {}
override fun commitDomainEventAsync(eventCommittingContext: EventCommittingContext) {
val eventMailboxIndex = getEventMailBoxIndex(eventCommittingContext.eventStream.aggregateRootId)
val eventMailbox = eventCommittingContextMailBoxList[eventMailboxIndex]
eventMailbox.enqueueMessage(eventCommittingContext)
}
override fun publishDomainEventAsync(processingCommand: ProcessingCommand, eventStream: DomainEventStream) {
if (eventStream.items == null || eventStream.items.size == 0) {
eventStream.items = processingCommand.items
}
val eventStreamMessage = DomainEventStreamMessage(
processingCommand.message.id,
eventStream.aggregateRootId,
eventStream.version,
eventStream.aggregateRootTypeName,
eventStream.events(),
eventStream.items)
publishDomainEventAsync(processingCommand, eventStreamMessage, 0)
}
private fun getEventMailBoxIndex(aggregateRootId: String): Int {
var hash = 23
for (c in aggregateRootId.toCharArray()) {
hash = (hash shl 5) - hash + c.toInt()
}
if (hash < 0) {
hash = Math.abs(hash)
}
return hash % eventMailBoxCount
}
private fun batchPersistEventAsync(committingContexts: List?, retryTimes: Int) {
if (committingContexts == null || committingContexts.size == 0) {
return
}
IOHelper.tryAsyncActionRecursively("BatchPersistEventAsync",
{ eventStore.batchAppendAsync(committingContexts.stream().map { obj: EventCommittingContext -> obj.eventStream }.collect(Collectors.toList())) },
{ result: EventAppendResult? ->
val eventMailBox = committingContexts.stream()
.findFirst()
.orElseThrow { MailBoxInvalidException("eventMailBox can not be null") }
.mailBox
if (result == null) {
logger.error("Batch persist events success, but the persist result is null, the current event committing mailbox should be pending, mailboxNumber: {}", eventMailBox.number)
return@tryAsyncActionRecursively
}
//针对持久化成功的聚合根，正常发布这些聚合根的事件到Q端
if (result.successAggregateRootIdList.size > 0) {
for (aggregateRootId in result.successAggregateRootIdList) {
val committingContextList = committingContexts.stream()
.filter { x: EventCommittingContext -> x.eventStream.aggregateRootId == aggregateRootId }
.collect(Collectors.toList())
if (committingContextList.size > 0) {
for (committingContext in committingContextList) {
publishDomainEventAsync(committingContext.processingCommand, committingContext.eventStream)
}
if (logger.isDebugEnabled) {
logger.debug("Batch persist events success, mailboxNumber: {}, aggregateRootId: {}",
eventMailBox.number,
aggregateRootId)
}
}
}
}
//针对持久化出现重复的命令ID，在命令MailBox中标记为已重复，在事件MailBox中清除对应聚合根产生的事件，且重新发布这些命令对应的领域事件到Q端
if (result.duplicateCommandAggregateRootIdList.size > 0) {
for ((key, value) in result.duplicateCommandAggregateRootIdList) {
val committingContextOptional = committingContexts.stream()
.filter { x: EventCommittingContext -> key == x.eventStream.aggregateRootId }
.findFirst()
if (committingContextOptional.isPresent) {
logger.warn("Batch persist events has duplicate commandIds, mailboxNumber: {}, aggregateRootId: {}, commandIds: {}",
eventMailBox.number,
key,
java.lang.String.join(",", value))
val committingContext = committingContextOptional.get()
resetCommandMailBoxConsumingSequence(committingContext, committingContext.processingCommand.sequence, value)
}
}
}
//针对持久化出现版本冲突的聚合根，则自动处理每个聚合根的冲突
if (result.duplicateEventAggregateRootIdList.size > 0) {
for (aggregateRootId in result.duplicateEventAggregateRootIdList) {
val committingContextOptional = committingContexts.stream().filter { x: EventCommittingContext -> x.eventStream.aggregateRootId == aggregateRootId }.findFirst()
if (committingContextOptional.isPresent) {
logger.warn("Batch persist events, mailboxNumber: {}, duplicateEventAggregateRootCount: {}, detail: {}",
eventMailBox.number,
result.duplicateEventAggregateRootIdList.size,
serializeService.serialize(result.duplicateEventAggregateRootIdList))
val eventCommittingContext = committingContextOptional.get()
if (eventCommittingContext.eventStream.version == 1) {
handleFirstEventDuplicationAsync(eventCommittingContext, 0)
} else {
resetCommandMailBoxConsumingSequence(eventCommittingContext, eventCommittingContext.processingCommand.sequence, null)
}
}
}
}
//最终，将当前的EventMailBox的本次处理标记为处理完成，然后继续可以处理下一批事件
eventMailBox.completeRun()
},
{ String.format("[contextListCount:%d]", committingContexts.size) },
null, retryTimes, true)
}
private fun resetCommandMailBoxConsumingSequence(context: EventCommittingContext, consumingSequence: Long, duplicateCommandIdList: List?): CompletableFuture {
val commandMailBox = context.processingCommand.mailBox
val eventMailBox = context.mailBox
val aggregateRootId = context.eventStream.aggregateRootId
commandMailBox.pause()
eventMailBox.removeAggregateAllEventCommittingContexts(aggregateRootId)
return memoryCache.refreshAggregateFromEventStoreAsync(context.eventStream.aggregateRootTypeName, aggregateRootId).thenAccept { x: IAggregateRoot? ->
try {
if (duplicateCommandIdList != null) {
for (commandId in duplicateCommandIdList) {
commandMailBox.addDuplicateCommandId(commandId)
}
}
commandMailBox.resetConsumingSequence(consumingSequence)
} finally {
commandMailBox.resume()
commandMailBox.tryRun()
}
}.exceptionally { ex: Throwable? ->
logger.error("ResetCommandMailBoxConsumingSequence has unknown exception, aggregateRootId: {}", aggregateRootId, ex)
null
}
}
private fun tryToRepublishEventAsync(context: EventCommittingContext, retryTimes: Int) {
val command = context.processingCommand.message
IOHelper.tryAsyncActionRecursively("FindEventByCommandIdAsync",
{ eventStore.findAsync(context.eventStream.aggregateRootId, command.id) },
{ result: DomainEventStream? ->
if (result != null) {
//这里，我们需要再重新做一遍发布事件这个操作；
//之所以要这样做是因为虽然该command产生的事件已经持久化成功，但并不表示事件已经发布出去了；
//因为有可能事件持久化成功了，但那时正好机器断电了，则发布事件都没有做；
publishDomainEventAsync(context.processingCommand, result)
} else {
//到这里，说明当前command想添加到eventStore中时，提示command重复，但是尝试从eventStore中取出该command时却找不到该command。
//出现这种情况，我们就无法再做后续处理了，这种错误理论上不会出现，除非eventStore的Add接口和Get接口出现读写不一致的情况；
//框架会记录错误日志，让开发者排查具体是什么问题。
val errorMessage = String.format("Command should be exist in the event store, but we cannot find it from the event store, this should not be happen, and we cannot continue again. commandType:%s, commandId:%s, aggregateRootId:%s",
command.javaClass.name,
command.id,
context.eventStream.aggregateRootId)
logger.error(errorMessage)
val commandResult = CommandResult(CommandStatus.Failed, command.id, command.aggregateRootId, "Command should be exist in the event store, but we cannot find it from the event store.", String::class.java.name)
completeCommand(context.processingCommand, commandResult)
}
},
{ String.format("[aggregateRootId:%s, commandId:%s]", command.aggregateRootId, command.id) },
null,
retryTimes, true)
}
private fun handleFirstEventDuplicationAsync(context: EventCommittingContext, retryTimes: Int): CompletableFuture {
val future = CompletableFuture()
IOHelper.tryAsyncActionRecursively("FindFirstEventByVersion",
{ eventStore.findAsync(context.eventStream.aggregateRootId, 1) },
{ result: DomainEventStream? ->
if (result != null) {
//判断是否是同一个command，如果是，则再重新做一遍发布事件；
//之所以要这样做，是因为虽然该command产生的事件已经持久化成功，但并不表示事件也已经发布出去了；
//有可能事件持久化成功了，但那时正好机器断电了，则发布事件都没有做；
if (context.processingCommand.message.id == result.commandId) {
resetCommandMailBoxConsumingSequence(context, context.processingCommand.sequence + 1, null)
.thenAccept { x: Void? ->
publishDomainEventAsync(context.processingCommand, result)
future.complete(null)
}
} else {
//如果不是同一个command，则认为是两个不同的command重复创建ID相同的聚合根，我们需要记录错误日志，然后通知当前command的处理完成；
val errorMessage = String.format("Duplicate aggregate creation. current commandId:%s, existing commandId:%s, aggregateRootId:%s, aggregateRootTypeName:%s",
context.processingCommand.message.id,
result.commandId,
result.aggregateRootId,
result.aggregateRootTypeName)
logger.error(errorMessage)
resetCommandMailBoxConsumingSequence(context, context.processingCommand.sequence + 1, null)
.thenAccept { x: Void? ->
val commandResult = CommandResult(CommandStatus.Failed, context.processingCommand.message.id, context.eventStream.aggregateRootId, "Duplicate aggregate creation.", String::class.java.name)
completeCommand(context.processingCommand, commandResult)
.thenAccept { c: Void? -> future.complete(null) }
}
}
} else {
val errorMessage = String.format("Duplicate aggregate creation, but we cannot find the existing eventstream from eventstore. commandId:%s, aggregateRootId:%s, aggregateRootTypeName:%s",
context.eventStream.commandId,
context.eventStream.aggregateRootId,
context.eventStream.aggregateRootTypeName)
logger.error(errorMessage)
resetCommandMailBoxConsumingSequence(context, context.processingCommand.sequence + 1, null).thenAccept { x: Void? ->
val commandResult = CommandResult(CommandStatus.Failed, context.processingCommand.message.id, context.eventStream.aggregateRootId, "Duplicate aggregate creation, but we cannot find the existing eventstream from eventstore.", String::class.java.name)
completeCommand(context.processingCommand, commandResult)
.thenAccept { c: Void? -> future.complete(null) }
}
}
},
{ String.format("[eventStream:%s]", serializeService.serialize(context.eventStream)) },
null, retryTimes, true)
return future
}
private fun publishDomainEventAsync(processingCommand: ProcessingCommand, eventStream: DomainEventStreamMessage, retryTimes: Int) {
IOHelper.tryAsyncActionRecursivelyWithoutResult("PublishDomainEventAsync",
{ domainEventPublisher.publishAsync(eventStream) },
{ result: Void? ->
if (logger.isDebugEnabled) {
logger.debug("Publish domain events success, {}", serializeService.serialize(eventStream))
}
val commandHandleResult = processingCommand.commandExecuteContext.result
val commandResult = CommandResult(CommandStatus.Success, processingCommand.message.id, eventStream.getAggregateRootId(), commandHandleResult, String::class.java.name)
completeCommand(processingCommand, commandResult)
},
{ String.format("[eventStream:%s]", serializeService.serialize(eventStream)) },
null, retryTimes, true)
}
private fun completeCommand(processingCommand: ProcessingCommand, commandResult: CommandResult): CompletableFuture {
return processingCommand.mailBox.completeMessage(processingCommand, commandResult)
}
companion object {
private val logger = LoggerFactory.getLogger(DefaultEventCommittingService::class.java)
}
init {
eventCommittingContextMailBoxList = ArrayList()
for (i in 0 until eventMailBoxCount) {
val mailBox = EventCommittingContextMailBox(i, 1000, { x: List? -> batchPersistEventAsync(x, 0) }, executor)
eventCommittingContextMailBoxList.add(mailBox)
}
}
}