sqlx4k-postgres-pgmq/io.github.smyrgeorge.sqlx4k.postgres.pgmq/PgmqClient

PgmqClient

class PgmqClient(val pg: PgmqDbAdapter, options: PgmqClient.Options = Options())(source)

PgMqClient is a client for interfacing with the pgmq system, providing various messaging queue operations. This client makes use of PostgreSQL as a message queue backend.

Parameters

The PgMqDbAdapter instance used for executing database queries.

options

Configuration options for the client, including installation verification and auto-install behavior.

Features:

Installation verification of the pgmq extension in the database.
Creating and managing queues with optional notification on message insertion.
Listing all existing queues.
Sending messages to a queue, with support for headers and optional delay.
Batch sending of messages to a queue.
Popping messages from a queue.
Reading messages from a queue with optional visibility timeout.
Archiving and deleting messages by single or bulk identifiers.
Purging all messages from a queue.

Constructors

PgmqClient

constructor(pg: PgmqDbAdapter, options: PgmqClient.Options = Options())

Types

Options

data class Options(val autoInstall: Boolean = false, val verifyInstallation: Boolean = true, val installFromFiles: Boolean = false, val installFilesPath: String = "./pgmq")

A data class that represents configuration options for an installation process.

Queue

data class Queue(val name: String, val unlogged: Boolean = false, val enableNotifyInsert: Boolean = false, val throttleNotifyInterval: Duration = 250.milliseconds)

Represents a queue configuration with specific attributes.

Properties

val pg: PgmqDbAdapter

Functions

ack

suspend fun ack(queue: String, id: Long): Result<Boolean>

Acknowledges a message in the specified queue with the given ID by performing a delete operation.

suspend fun ack(queue: String, ids: List<Long>): Result<List<Long>>

Acknowledges the provided list of message IDs for the specified queue.

archive

suspend fun archive(queue: String, id: Long): Result<Boolean>

Archives an item identified by its ID from a specified queue.

suspend fun archive(queue: String, ids: List<Long>): Result<List<Long>>

Archives the specified items identified by their IDs from the given queue.

bindTopic

suspend fun bindTopic(pattern: String, queueName: String): Result<Unit>

Creates a topic binding between a pattern and a queue.

suspend fun bindTopic(patterns: List<String>, queueName: String): Result<Unit>

Creates topic bindings for multiple patterns to a single queue.

create

suspend fun create(queue: PgmqClient.Queue): Result<Unit>

Creates a queue in the system with the specified configuration.

delete

suspend fun delete(queue: String, id: Long): Result<Boolean>

Deletes an item with the specified ID from the given queue.

suspend fun delete(queue: String, ids: List<Long>): Result<List<Long>>

Deletes the specified items from the given queue.

drop

suspend fun drop(queue: PgmqClient.Queue): Result<Boolean>

Drops the specified queue from the system.

install

suspend fun install()

Installs the required components or extensions for the pgmq functionality.

installExtension

suspend fun installExtension(file: Pair<String, String>)

Installs an extension by executing SQL statements from the provided file. The file content is split into individual SQL statements, which are executed in a single transaction.

installExtensions

suspend fun installExtensions(path: String)

Installs extensions by reading SQL files from the specified directory and processing each file.

installFromExtension

suspend fun installFromExtension()

Installs the pgmq extension in the PostgreSQL database if it is not already installed.

installFromMigrationFiles

suspend fun installFromMigrationFiles(files: List<MigrationFile>)

Executes database migrations from a list of migration files.

installFromPath

suspend fun installFromPath(path: String = options.installFilesPath)

Installs the necessary files from a specified directory path.

installFromSqlFiles

suspend fun installFromSqlFiles(files: List<Pair<String, String>>)

Installs database migrations from a list of SQL files.

listQueues

suspend fun listQueues(): Result<List<QueueRecord>>

Retrieves the list of all available queues in the system.

metrics

suspend fun metrics(): Result<List<Metrics>>

Retrieves a list of metrics from the database using the pgmq.metrics() query.

suspend fun metrics(queue: String): Result<Metrics>

Retrieves metrics for the specified queue.

nack

suspend fun nack(queue: String, id: Long, vt: Duration = Duration.ZERO): Result<Long>

Sends a negative acknowledgment (nack) to the specified queue for the given message ID, optionally resetting the visibility timeout (VT) to a new duration.

pop

suspend fun pop(queue: String, quantity: Int = 1): Result<List<Message>>

Removes and retrieves messages from the specified queue.

purge

suspend fun purge(queue: PgmqClient.Queue): Result<Long>

Removes all messages from the specified queue.

read

suspend fun read(queue: String, quantity: Int = 1, vt: Duration = 30.seconds): Result<List<Message>>

Reads messages from a specified queue.

send

suspend fun send(queue: String, message: String, headers: Map<String, String> = emptyMap(), delay: Duration = 0.seconds): Result<Long>

Sends a message to the specified queue with optional headers and delay.

suspend fun send(queue: String, messages: List<String>, headers: Map<String, String> = emptyMap(), delay: Duration = 0.seconds): Result<List<Long>>

Sends multiple messages to the specified queue with optional headers and delay.

sendTopic

suspend fun sendTopic(routingKey: String, message: String, headers: Map<String, String> = emptyMap(), delay: Duration = 0.seconds): Result<Long>

Sends a message to all queues that match the routing key pattern.

setVt

suspend fun setVt(queue: String, id: Long, vt: Duration): Result<Long>

Updates the visibility timeout (VT) for a specific item in the given queue.

unbindTopic

suspend fun unbindTopic(pattern: String, queueName: String): Result<Boolean>

Removes a topic binding between a pattern and a queue.