feat(job-queue): deesigning methods

include/vieter_job_queue.h

@@ -14,27 +14,82 @@
 typedef enum vieter_job_state {
   vieter_job_state_queued = 0,
   vieter_job_state_ready = 1,
-  vieter_job_state_build_finished = 2
+  vieter_job_state_build_finished = 2,
+  vieter_job_state_failed = 3
 } vieter_job_state;
 
 // This macro should be kept in sync with the above enum
-#define VIETER_JOB_STATES 3
+#define VIETER_JOB_STATES 4
 
+/*
+ * Struct storing a report for why a certain job failed to be processed in the
+ * given state.
+ */
+typedef struct vieter_job_failure_report {
+  vieter_job_state failed_state;
+  char *msg;
+} vieter_job_failure_report;
+
+vieter_job_failure_report *vieter_job_failure_report_init();
+
+void vieter_job_failure_report_free(vieter_job_failure_report **ptp);
+
+/*
+ * Represents a job currently being processed in the system. A job migrates
+ * between different states before finally being removed from the queue.
+ */
 typedef struct vieter_job {
-  int id;
+  uint64_t id;
   uint64_t next_scheduled_time;
-  vieter_cron_expression *ce;
-  bool single;
-  vieter_job_state state;
-  uint64_t state_transition_times[VIETER_JOB_STATES];
-  bool dispatched;
+  vieter_cron_expression *schedule;
   void *build_config;
+  vieter_job_failure_report *failure_report;
+  uint64_t state_transition_times[VIETER_JOB_STATES];
+  vieter_job_state current_state;
+  bool single;
+  bool dispatched;
 } vieter_job;
 
+/*
+ * Allocate a new vieter_job object.
+ */
+vieter_job *vieter_job_init();
+
+void vieter_job_free(vieter_job **ptp);
+
+/*
+ * Represents the actual queue managing the list of jobs.
+ */
 typedef struct vieter_job_queue vieter_job_queue;
 
+typedef enum vieter_job_queue_error {
+  vieter_job_queue_ok = 0,
+  vieter_job_queue_not_found = 1
+} vieter_job_queue_error;
+
+/*
+ * Allocate and initialize a new job queue.
+ */
 vieter_job_queue *vieter_job_queue_init();
 
-void vieter_job_queue_insert(int id);
+void vieter_job_queue_free(vieter_job_queue **ptp);
+
+/*
+ * Insert the given job into the system.
+ */
+vieter_job_queue_error vieter_job_queue_insert(vieter_job *job);
+
+/*
+ * Dispatch the job with the given id, returning the pointer to the job.
+ * Dispatching a job removes it from its respective state's queue.
+ */
+vieter_job_queue_error vieter_job_queue_dispatch(vieter_job **out, uint64_t id);
+
+/*
+ * Transition the job with the given id to the new state. This sets the
+ * job's dispatch flag to false, and adds it to the new state's queue.
+ */
+vieter_job_queue_error vieter_job_queue_transition(uint64_t id,
+                                                   vieter_job_state new_state);
 
 #endif