Supervisar eventos de aplicaciones

import com.mongodb.kotlin.client.MongoClient
import org.bson.Document
import com.mongodb.event.*
import com.mongodb.MongoClientSettings
import com.mongodb.ConnectionString
class CommandCounter : CommandListener {
    private val commands = mutableMapOf<String, Int>()
    override fun commandSucceeded(event: CommandSucceededEvent) {
        val commandName = event.commandName
        val count = commands[commandName] ?: 0
        commands[commandName] = count + 1
        println(commands.toString())
    }
    override fun commandFailed(event: CommandFailedEvent) {
        println("Failed execution of command '${event.commandName}' with id ${event.requestId}")
    }
}
fun main() {
    val uri = "<connection string uri>"
// Instantiate your new listener
    val commandCounter = CommandCounter()
// Include the listener in your client settings
    val settings = MongoClientSettings.builder()
        .applyConnectionString(ConnectionString(uri))
        .addCommandListener(commandCounter)
        .build()
// Connect to your database
    val mongoClient = MongoClient.create(settings)
    val database = mongoClient.getDatabase("sample_mflix")
    val collection = database.getCollection<Document>("movies")
// Run some commands to test the counter
    collection.find().firstOrNull()
    collection.find().firstOrNull()
    mongoClient.close()
}

import com.mongodb.kotlin.client.MongoClient
import org.bson.Document
import com.mongodb.event.*
import com.mongodb.MongoClientSettings
import com.mongodb.ConnectionString
class IsWriteable : ClusterListener {
    private var isWritable = false
    override fun clusterDescriptionChanged(event: ClusterDescriptionChangedEvent) {
        if (!isWritable) {
            if (event.newDescription.hasWritableServer()) {
                isWritable = true
                println("Able to write to cluster")
            }
        } else {
            if (!event.newDescription.hasWritableServer()) {
                isWritable = false
                println("Unable to write to cluster")
            }
        }
    }
}
fun main() {
    val uri = "<connection string uri>"
// Instantiate your new listener
    val clusterListener = IsWriteable()
// Include the listener in your client settings
    val settings = MongoClientSettings.builder()
        .applyConnectionString(ConnectionString(uri))
        .applyToClusterSettings { builder ->
            builder.addClusterListener(clusterListener)
        }
        .build()
// Connect to your database
    val mongoClient = MongoClient.create(settings)
    val database = mongoClient.getDatabase("sample_mflix")
    val collection = database.getCollection<Document>("movies")
// Run a command to trigger a ClusterDescriptionChangedEvent event
    collection.find().firstOrNull()
    mongoClient.close()
}

import com.mongodb.kotlin.client.MongoClient
import org.bson.Document
import com.mongodb.event.*
import com.mongodb.MongoClientSettings
import com.mongodb.ConnectionString
class ConnectionPoolLibrarian : ConnectionPoolListener {
    override fun connectionCheckedOut(event: ConnectionCheckedOutEvent) {
        println("Let me get you the connection with id ${event.connectionId.localValue}...")
    }
    override fun connectionCheckOutFailed(event: ConnectionCheckOutFailedEvent) {
        println("Something went wrong! Failed to checkout connection.")
    }
}
fun main() {
    val uri = "<connection string uri>"
// Instantiate your new listener
val cpListener = ConnectionPoolLibrarian()
// Include the listener in your client settings
    val settings = MongoClientSettings.builder()
        .applyConnectionString(ConnectionString(uri))
        .applyToConnectionPoolSettings({
            it.addConnectionPoolListener(cpListener)
            })
        .build()
// Connect to your database        
    val mongoClient = MongoClient.create(settings)
    val database = mongoClient.getDatabase("sample_mflix")
    val collection = database.getCollection<Document>("movies")
// Run some commands to test the counter
    collection.find().firstOrNull()
    mongoClient.close()
}