From 7ecfb22c32b7986ed1a2439c1abbeed298e4153a Mon Sep 17 00:00:00 2001
From: Douglas Rumbaugh <dbr4@psu.edu>
Date: Fri, 20 Oct 2023 17:00:42 -0400
Subject: Initial pass w/ new scheduler setup

currently there's a race condition of some type to sort out.
---
 include/framework/scheduling/Task.h | 112 +++++++++---------------------------
 1 file changed, 27 insertions(+), 85 deletions(-)

(limited to 'include/framework/scheduling/Task.h')

diff --git a/include/framework/scheduling/Task.h b/include/framework/scheduling/Task.h
index 3c1b158..518159d 100644
--- a/include/framework/scheduling/Task.h
+++ b/include/framework/scheduling/Task.h
@@ -5,111 +5,53 @@
 
 #include <variant>
 #include <future>
+#include <functional>
 
 #include "framework/util/Configuration.h"
 
 namespace de {
 
-enum class TaskType {
-    MERGE,
-    QUERY
+struct MergeArgs {
+    void *version;
+    void *buffer;
+    std::vector<MergeTask> merges;
+    std::promise<bool> result;
 };
 
-struct TaskDependency {
-    std::promise<void> prom;
-    std::future<void> fut;
+template <typename R>
+struct QueryArgs {
+    void *version;
+    void *buffer;
+    std::promise<std::vector<R>> result_set;
+    void *query_parms;
 };
 
-struct MergeTask {
-    level_index m_source_level;
-    level_index m_target_level;
-    size_t m_timestamp;
-    size_t m_size;
-    TaskType m_type;
-    std::unique_ptr<TaskDependency> m_dep;
-
-    MergeTask() = default;
-
-    MergeTask(level_index source, level_index target, size_t size, size_t timestamp)
-    : m_source_level(source)
-    , m_target_level(target)
-    , m_timestamp(timestamp)
-    , m_size(size)
-    , m_type(TaskType::MERGE)
-    , m_dep(std::make_unique<TaskDependency>()){}
-
+typedef std::function<void(void*)> Job;
 
-    MergeTask(MergeTask &t)
-    : m_source_level(t.m_source_level)
-    , m_target_level(t.m_target_level)
-    , m_timestamp(t.m_timestamp)
-    , m_size(t.m_size)
-    , m_type(TaskType::MERGE)
-    , m_dep(std::move(t.m_dep))
+struct Task {
+    Task(size_t size, size_t ts, Job job, void *args) 
+      : m_job(job)
+      , m_size(size)
+      , m_timestamp(ts)
+      , m_args(args)
     {}
 
-
-    TaskType get_type() const {
-        return m_type;
-    }
-
-    void make_dependent_on(MergeTask &task) {
-        m_dep->fut = task.m_dep->prom.get_future();
-    }
-
-    void make_dependent_on(TaskDependency *dep) {
-        m_dep->fut = dep->prom.get_future();
-    }
-
-    friend bool operator<(const MergeTask &self, const MergeTask &other) {
-        return self.m_timestamp < other.m_timestamp;
-    }
-
-    friend bool operator>(const MergeTask &self, const MergeTask &other) {
-        return self.m_timestamp > other.m_timestamp;
-    }
-
-};
-
-struct QueryTask {
-    size_t m_timestamp;
+    Job m_job;
     size_t m_size;
-    TaskType m_type;
-    std::unique_ptr<TaskDependency> m_dep;
-
-    QueryTask(QueryTask &t) 
-        : m_timestamp(t.m_timestamp)
-        , m_size(t.m_size)
-        , m_type(t.m_type)
-        , m_dep(std::move(t.m_dep))
-    {}
-
-    TaskType get_type() const {
-        return m_type;
-    }
-
-    void SetDependency(QueryTask &task) {
-        m_dep->fut = task.m_dep->prom.get_future();
-    }
-
-    void SetDependency(TaskDependency *dep) {
-        m_dep->fut = dep->prom.get_future();
-    }
+    size_t m_timestamp;
+    void *m_args;
 
-    friend bool operator<(const QueryTask &self, const QueryTask &other) {
+    friend bool operator<(const Task &self, const Task &other) {
         return self.m_timestamp < other.m_timestamp;
     }
 
-    friend bool operator>(const QueryTask &self, const QueryTask &other) {
+    friend bool operator>(const Task &self, const Task &other) {
         return self.m_timestamp > other.m_timestamp;
     }
-};
 
-struct GetTaskType {
-    TaskType operator()(const MergeTask &t) { return t.get_type(); }
-    TaskType operator()(const QueryTask &t) { return t.get_type(); }
+    void operator()() {
+        m_job(m_args);
+    }
 };
 
-typedef std::variant<MergeTask, QueryTask> Task;
-
 }
-- 
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