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r.0.9.1.source-code.Configuration.kt Maven / Gradle / Ivy

package se.wollan.tolr

import kotlin.time.Duration
import kotlin.time.Duration.Companion.minutes
import kotlin.time.Duration.Companion.seconds

/**
 * @param locallyExposedHostname only relevant to specify for nodes that will receive incoming replication requests
 */
data class Configuration(
    val localNodeId: NodeId,
    private val remoteHostnames: Set,
    val retryDelayOnFailure: Duration = 10.seconds,
    val heartbeatTriggerInterval: Duration = 5.minutes,
    val pageSize: PageSize = PageSize.default,
    val locallyExposedHostname: RemoteHostname = RemoteHostname(localNodeId.value)
) {
    val remoteHostnamesSafe = remoteHostnames - locallyExposedHostname - RemoteHostname(localNodeId.value)
}

interface ConfigurationProvider {
    suspend fun getConfiguration(): Configuration
}

class StaticConfigurationProvider(private val configuration: Configuration) : ConfigurationProvider {
    override suspend fun getConfiguration(): Configuration = configuration
}

/**
 * This class in not thread-safe as the initial configuration is supposed to get resolved indirectly with
 * the start-lock inside [TotalOrderedLog.startReplicating].
 */
internal class CachedConfigurationProviderDecorator(private val inner: ConfigurationProvider) : ConfigurationProvider {

    @Volatile
    private var cachedConfiguration: Configuration? = null

    override suspend fun getConfiguration(): Configuration {
        cachedConfiguration?.let { return it }

        val configuration = inner.getConfiguration()
        cachedConfiguration = configuration

        return configuration
    }
}