io.getunleash.polling.AutoPollingPolicy.kt Maven / Gradle / Ivy
package io.getunleash.polling
import io.getunleash.UnleashConfig
import io.getunleash.UnleashContext
import io.getunleash.cache.ToggleCache
import io.getunleash.data.Toggle
import org.slf4j.LoggerFactory
import java.util.Timer
import java9.util.concurrent.CompletableFuture
import java.util.concurrent.atomic.AtomicBoolean
import kotlin.concurrent.timer
class AutoPollingPolicy(
override val unleashFetcher: UnleashFetcher,
override val cache: ToggleCache,
override val config: UnleashConfig,
override var context: UnleashContext,
autoPollingConfig: AutoPollingMode
) :
RefreshPolicy(
unleashFetcher = unleashFetcher,
cache = cache,
logger = LoggerFactory.getLogger("io.getunleash.polling.AutoPollingPolicy"),
config = config,
context = context
) {
private val initialized = AtomicBoolean(false)
private val initFuture = CompletableFuture()
private val timer: Timer
init {
autoPollingConfig.togglesUpdatedListener.let { listeners.add(it) }
autoPollingConfig.erroredListener.let { errorListeners.add(it) }
timer =
timer(
name = "unleash_toggles_fetcher",
initialDelay = 0L,
daemon = true,
period = autoPollingConfig.pollRateDuration
) {
updateToggles()
if (!initialized.getAndSet(true)) {
initFuture.complete(null)
}
}
}
override fun getConfigurationAsync(): CompletableFuture> {
return if (this.initFuture.isDone) {
CompletableFuture.completedFuture(super.readToggleCache())
} else {
this.initFuture.thenApplyAsync { super.readToggleCache() }
}
}
private fun updateToggles() {
try {
val response = super.fetcher().getTogglesAsync(context).get()
val cached = super.readToggleCache()
if (response.isFetched() && cached != response.toggles) {
super.writeToggleCache(response.toggles)
this.broadcastTogglesUpdated()
} else if (response.isFailed()) {
}
} catch (e: Exception) {
this.broadcastTogglesErrored(e)
logger.warn("Exception in AutoPollingCachePolicy", e)
}
}
private fun broadcastTogglesErrored(e: Exception) {
synchronized(errorListeners) {
errorListeners.forEach {
it.onError(e)
}
}
}
private fun broadcastTogglesUpdated() {
synchronized(listeners) {
listeners.forEach {
it.onTogglesUpdated()
}
}
}
override fun close() {
super.close()
this.timer.cancel()
this.listeners.clear()
}
}