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(ns com.github.ivarref.yoltq.report-queue
(:require [com.github.ivarref.yoltq.utils :as u]
[com.github.ivarref.yoltq.impl :as i]
[datomic.api :as d]
[clojure.tools.logging :as log])
(:import (datomic Connection Datom)
(java.util.concurrent LinkedBlockingQueue ScheduledExecutorService BlockingQueue TimeUnit)))
(defn process-poll-result! [cfg id-ident poll-result consumer]
(let [{:keys [tx-data db-after]} poll-result]
(when-let [new-ids (->> tx-data
(filter (fn [^Datom datom] (and
(= (.a datom) id-ident)
(.added datom))))
(mapv (fn [^Datom datom] (.v datom)))
(into [])
(not-empty))]
(doseq [id new-ids]
(consumer (fn []
(try
(let [{:com.github.ivarref.yoltq/keys [lock id status queue-name bindings]} (u/get-queue-item db-after id)]
(with-bindings (or bindings {})
(if (i/depends-on-waiting? cfg {:id id})
nil
(some->>
(u/prepare-processing db-after id queue-name lock status)
(i/take! cfg)
(i/execute! cfg)))))
(catch Throwable t
(log/error t "Unexpected error in process-poll-result!")))))))))
(defn report-queue-listener [running?
ready?
^ScheduledExecutorService pool
config-atom]
(let [cfg @config-atom
conn (:conn cfg)
tx-report-queue-given (contains? cfg :tx-report-queue)
^BlockingQueue q (if tx-report-queue-given
(get cfg :tx-report-queue)
(d/tx-report-queue conn))
id-ident (d/q '[:find ?e .
:where [?e :db/ident :com.github.ivarref.yoltq/id]]
(d/db conn))]
(assert (instance? BlockingQueue q))
(log/debug "tx-report-queue-given:" tx-report-queue-given)
(try
(while @running?
(when-let [poll-result (.poll ^BlockingQueue q 1 TimeUnit/SECONDS)]
(process-poll-result! @config-atom
id-ident
poll-result
(fn [f]
(when @running?
(.execute ^ScheduledExecutorService pool f)))))
(deliver ready? :ready))
(catch Throwable t
(log/error t "Unexpected error in report-queue-listener:" (.getMessage t)))
(finally
(if tx-report-queue-given
(log/debug "Remove tx-report-queue handled elsewhere")
(do
(log/debug "Remove tx-report-queue")
(d/remove-tx-report-queue conn)))))))
(defonce ^:private multicast-state-lock (Object.))
(defonce ^:private multicast-state (atom {}))
(defn- start-multicaster! [conn]
(let [multicaster-ready? (promise)]
(future
(log/debug "Multicaster starting for conn" conn)
(try
(let [input-queue (d/tx-report-queue conn)]
(loop []
(when-let [mcast-state (get @multicast-state conn)]
(when-let [dest-queues (vals mcast-state)]
(let [element (.poll ^BlockingQueue input-queue 1 TimeUnit/SECONDS)]
(deliver multicaster-ready? :ready)
(when (some? element)
(doseq [q dest-queues]
(let [ok-offer (.offer ^BlockingQueue q element 30 TimeUnit/MINUTES)]
(when (false? ok-offer)
(log/error "Failed to offer item in multicaster for connection" conn))))))
(recur)))))
(catch Throwable t
(deliver multicaster-ready? :error)
(log/error t "Unexpected error in multicaster:" (.getMessage t)))
(finally
(d/remove-tx-report-queue conn)
(log/debug "Multicaster exiting for conn" conn))))
multicaster-ready?))
(defn get-tx-report-queue-multicast!
"Multicast the datomic.api/tx-report-queue to different consumers.
The multicaster is started on demand. `conn` and `id` identifies the consumer.
Returns a `java.util.concurrent.BlockingQueue` like `datomic.api/tx-report-queue`."
[conn id]
(assert (instance? Connection conn))
(assert (keyword? id))
(locking multicast-state-lock
(assert (map? @multicast-state))
(if-let [existing-q (get-in @multicast-state [conn id])]
(do
(log/debug "returning existing queue for id" id)
(assert (instance? BlockingQueue existing-q))
existing-q)
(let [needs-multicaster? (not (contains? @multicast-state conn))
new-state (swap! multicast-state (fn [old-state] (assoc-in old-state [conn id] (LinkedBlockingQueue.))))]
(when needs-multicaster?
(let [multicaster-promise (start-multicaster! conn)
multicaster-result (deref multicaster-promise (* 30 60000) :timeout)]
(cond (= multicaster-result :timeout)
(do
(log/error "Timeout waiting for multicaster to start")
(throw (RuntimeException. "Timeout waiting for multicaster to start")))
(= multicaster-result :error)
(do
(log/error "Multicaster failed to start")
(throw (RuntimeException. "Multicaster failed to start")))
(= multicaster-result :ready)
(log/debug "Multicaster is ready")
:else
(do
(log/error "Unexpected state from multicaster:" multicaster-result)
(throw (RuntimeException. (str "Unexpected state from multicaster: " multicaster-result)))))))
(let [new-q (get-in new-state [conn id])]
(assert (instance? BlockingQueue new-q))
new-q)))))
(defn stop-all-multicasters! []
(reset! multicast-state {}))
(comment
(do
(require 'com.github.ivarref.yoltq.log-init)
(com.github.ivarref.yoltq.log-init/init-logging!
[[#{"datomic.*" "com.datomic.*" "org.apache.*"} :warn]
[#{"com.github.ivarref.yoltq.report-queue"} :debug]
[#{"com.github.ivarref.yoltq.poller"} :info]
[#{"com.github.ivarref.yoltq"} :debug]
;[#{"ivarref.yoltq*"} :info]
[#{"*"} :info]])
(defonce conn (let [uri (str "datomic:mem://demo")
_ (d/delete-database uri)
_ (d/create-database uri)
conn (d/connect uri)]
conn))))
(comment
(defn drain! [^BlockingQueue q]
(loop [cnt 0]
(if (nil? (.poll q 1 TimeUnit/SECONDS))
cnt
(recur (inc cnt))))))
(comment
(let [q-1 (get-tx-report-queue-multicast! conn :q1)
q-2 (get-tx-report-queue-multicast! conn :q2)]))
(comment
(drain! (get-tx-report-queue-multicast! conn :q1)))
(comment
(do
@(d/transact conn [{:db/doc "demo"}])
:yay))
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