org.enodeframework.commanding.ProcessingCommandMailbox.kt Maven / Gradle / Ivy
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The enodeframework core implementation.
package org.enodeframework.commanding
import org.enodeframework.common.io.Task
import org.slf4j.LoggerFactory
import java.util.*
import java.util.concurrent.CompletableFuture
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.Executor
import java.util.concurrent.atomic.AtomicInteger
/**
* @author [email protected]
*/
class ProcessingCommandMailbox(aggregateRootId: String, messageHandler: IProcessingCommandHandler, batchSize: Int, private val executor: Executor) {
private val lockObj = Any()
private val asyncLock = Any()
/**
* Sequence 对应 ProcessingCommand
*/
private var messageDict: ConcurrentHashMap
private var duplicateCommandIdDict: ConcurrentHashMap
private val messageHandler: IProcessingCommandHandler
private val batchSize: Int
private val isUsing = AtomicInteger(0)
private val isRemoved = AtomicInteger(0)
var aggregateRootId: String
var lastActiveTime: Date
var isRunning = false
private set
var isPauseRequested = false
private set
var isPaused = false
private set
private var nextSequence: Long = 0
var consumingSequence: Long = 0
private set
val maxMessageSequence: Long
get() = nextSequence - 1
val totalUnHandledMessageCount: Long
get() = nextSequence - consumingSequence
/**
* 放入一个消息到MailBox，并自动尝试运行MailBox
*/
fun enqueueMessage(message: ProcessingCommand) {
synchronized(lockObj) {
message.sequence = nextSequence
message.mailBox = this
// If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.
if (messageDict.putIfAbsent(message.sequence, message) == null) {
nextSequence++
if (logger.isDebugEnabled) {
logger.debug("{} enqueued new message, aggregateRootId: {}, messageSequence: {}", javaClass.name, aggregateRootId, message.sequence)
}
lastActiveTime = Date()
tryRun()
} else {
logger.error("{} enqueue message failed, aggregateRootId: {}, messageId: {}, messageSequence: {}", javaClass.name, aggregateRootId, message.message.id, message.sequence)
}
}
}
fun tryRun() {
synchronized(lockObj) {
if (isRunning || isPauseRequested || isPaused) {
return
}
setAsRunning()
if (logger.isDebugEnabled) {
logger.debug("{} start run, aggregateRootId: {}, consumingSequence: {}", javaClass.name, aggregateRootId, consumingSequence)
}
CompletableFuture.runAsync({ processMessages() }, executor)
}
}
/**
* 请求完成MailBox的单次运行，如果MailBox中还有剩余消息，则继续尝试运行下一次
*/
fun completeRun() {
lastActiveTime = Date()
if (logger.isDebugEnabled) {
logger.debug("{} complete run, aggregateRootId: {}", javaClass.name, aggregateRootId)
}
setAsNotRunning()
if (totalUnHandledMessageCount > 0) {
tryRun()
}
}
/**
* 暂停当前MailBox的运行，暂停成功可以确保当前MailBox不会处于运行状态，也就是不会在处理任何消息
*/
fun pause() {
isPauseRequested = true
if (logger.isDebugEnabled) {
logger.debug("{} pause requested, aggregateRootId: {}", javaClass.name, aggregateRootId)
}
var count = 0L
while (isRunning) {
Task.sleep(10)
count++
if (count % 100 == 0L) {
if (logger.isDebugEnabled) {
logger.debug("{} pause requested, but wait for too long to stop the current mailbox, aggregateRootId: {}, waitCount: {}", javaClass.name, aggregateRootId, count)
}
}
}
lastActiveTime = Date()
isPaused = true
}
/**
* 恢复当前MailBox的运行，恢复后，当前MailBox又可以进行运行，需要手动调用TryRun方法来运行
*/
fun resume() {
isPauseRequested = false
isPaused = false
lastActiveTime = Date()
if (logger.isDebugEnabled) {
logger.debug("{} resume requested, agg`regateRootId: {}, consumingSequence: {}", javaClass.name, aggregateRootId, consumingSequence)
}
}
fun addDuplicateCommandId(commandId: String) {
duplicateCommandIdDict.putIfAbsent(commandId, 1.toByte())
}
fun resetConsumingSequence(consumingSequence: Long) {
this.consumingSequence = consumingSequence
lastActiveTime = Date()
if (logger.isDebugEnabled) {
logger.debug("{} reset consumingSequence, aggregateRootId: {}, consumingSequence: {}", javaClass.name, aggregateRootId, consumingSequence)
}
}
fun completeMessage(message: ProcessingCommand, result: CommandResult): CompletableFuture {
try {
val removed = messageDict.remove(message.sequence)
if (removed != null) {
duplicateCommandIdDict.remove(message.message.id)
lastActiveTime = Date()
return message.completeAsync(result);
}
} catch (ex: Exception) {
logger.error("{} complete message with result failed, aggregateRootId: {}, messageId: {}, messageSequence: {}, result: {}", javaClass.name, aggregateRootId, message.message.id, message.sequence, result, ex)
}
return Task.completedTask
}
fun isInactive(timeoutSeconds: Int): Boolean {
return System.currentTimeMillis() - lastActiveTime.time >= timeoutSeconds
}
fun processMessages() {
synchronized(asyncLock) {
lastActiveTime = Date()
try {
var scannedCount = 0;
while (totalUnHandledMessageCount > 0 && scannedCount < batchSize && !isPauseRequested) {
val message = getMessage(consumingSequence)
if (message != null) {
if (duplicateCommandIdDict.containsKey(message.message.id)) {
message.isDuplicated = true
}
Task.await(messageHandler.handleAsync(message));
}
scannedCount++;
consumingSequence++;
}
} catch (ex: Exception) {
logger.error("{} run has unknown exception, aggregateRootId: {}", javaClass.name, aggregateRootId, ex)
Task.sleep(1)
} finally {
completeRun()
}
}
}
private fun getMessage(sequence: Long): ProcessingCommand? {
return messageDict.getOrDefault(sequence, null)
}
private fun setAsRunning() {
isRunning = true
}
fun tryUsing(): Boolean {
return isUsing.compareAndSet(0, 1)
}
fun exitUsing() {
isUsing.set(0)
}
fun markAsRemoved() {
isRemoved.set(1)
}
fun isUsing(): Boolean {
return isUsing.get() == 1
}
fun isRemoved(): Boolean {
return isRemoved.get() == 1
}
private fun setAsNotRunning() {
isRunning = false
}
companion object {
val logger = LoggerFactory.getLogger(ProcessingCommandMailbox::class.java)
}
init {
messageDict = ConcurrentHashMap()
duplicateCommandIdDict = ConcurrentHashMap()
this.messageHandler = messageHandler
this.batchSize = batchSize
this.aggregateRootId = aggregateRootId
lastActiveTime = Date()
}
}