Implemented wait_requests as vector (#943)

src/plasma/plasma_manager.cc

@@ -22,10 +22,10 @@
 
 /* C++ includes. */
 #include <unordered_map>
+#include <vector>
 
 #include "uthash.h"
 #include "utlist.h"
-#include "utarray.h"
 #include "utstring.h"
 #include "common_protocol.h"
 #include "io.h"
@@ -216,15 +216,11 @@ struct WaitRequest {
   int64_t num_satisfied;
 };
 
-/** This is used to define the utarray of wait requests in the
- *  ObjectWaitRequests struct. */
-UT_icd wait_request_icd = {sizeof(WaitRequest *), NULL, NULL, NULL};
-
 typedef struct {
   /** The ID of the object. This is used as a key in a hash table. */
   ObjectID object_id;
   /** An array of the wait requests involving this object ID. */
-  UT_array *wait_requests;
+  std::vector<WaitRequest *> wait_requests;
   /** Handle for the uthash table in the manager state that keeps track of the
    *  wait requests involving this object ID. */
   UT_hash_handle hh;
@@ -383,16 +379,14 @@ void add_wait_request_for_object(PlasmaManagerState *manager_state,
    * new ObjectWaitRequests struct for this object ID and add it to the hash
    * table. */
   if (object_wait_reqs == NULL) {
-    object_wait_reqs =
-        (ObjectWaitRequests *) malloc(sizeof(ObjectWaitRequests));
+    object_wait_reqs = new ObjectWaitRequests();
     object_wait_reqs->object_id = object_id;
-    utarray_new(object_wait_reqs->wait_requests, &wait_request_icd);
     HASH_ADD(hh, *object_wait_requests_table_ptr, object_id,
              sizeof(object_wait_reqs->object_id), object_wait_reqs);
   }
   /* Add this wait request to the vector of wait requests involving this object
    * ID. */
-  utarray_push_back(object_wait_reqs->wait_requests, &wait_req);
+  object_wait_reqs->wait_requests.push_back(wait_req);
 }
 
 void remove_wait_request_for_object(PlasmaManagerState *manager_state,
@@ -408,12 +402,11 @@ void remove_wait_request_for_object(PlasmaManagerState *manager_state,
    * vector contains the wait request, then remove the wait request from the
    * vector. */
   if (object_wait_reqs != NULL) {
-    for (int i = 0; i < utarray_len(object_wait_reqs->wait_requests); ++i) {
-      WaitRequest **wait_req_ptr =
-          (WaitRequest **) utarray_eltptr(object_wait_reqs->wait_requests, i);
-      if (*wait_req_ptr == wait_req) {
+    for (int i = 0; i < object_wait_reqs->wait_requests.size(); ++i) {
+      if (object_wait_reqs->wait_requests[i] == wait_req) {
         /* Remove the wait request from the array. */
-        utarray_erase(object_wait_reqs->wait_requests, i, 1);
+        object_wait_reqs->wait_requests.erase(
+            object_wait_reqs->wait_requests.begin() + i);
         break;
       }
     }
@@ -461,18 +454,16 @@ void update_object_wait_requests(PlasmaManagerState *manager_state,
   HASH_FIND(hh, *object_wait_requests_table_ptr, &obj_id, sizeof(obj_id),
             object_wait_reqs);
   if (object_wait_reqs != NULL) {
-    /* We compute the number of requests first because the length of the utarray
+    /* We compute the number of requests first because the length of the vector
      * will change as we iterate over it (because each call to return_from_wait
      * will remove one element). */
-    int num_requests = utarray_len(object_wait_reqs->wait_requests);
-    /* The argument index is the index of the current element of the utarray
+    int num_requests = object_wait_reqs->wait_requests.size();
+    /* The argument index is the index of the current element of the vector
      * that we are processing. It may differ from the counter i when elements
      * are removed from the array. */
     int index = 0;
     for (int i = 0; i < num_requests; ++i) {
-      WaitRequest **wait_req_ptr = (WaitRequest **) utarray_eltptr(
-          object_wait_reqs->wait_requests, index);
-      WaitRequest *wait_req = *wait_req_ptr;
+      WaitRequest *wait_req = object_wait_reqs->wait_requests[index];
       wait_req->num_satisfied += 1;
       /* Mark the object as present in the wait request. */
       auto object_request =
@@ -493,12 +484,11 @@ void update_object_wait_requests(PlasmaManagerState *manager_state,
         index += 1;
       }
     }
-    DCHECK(index == utarray_len(object_wait_reqs->wait_requests));
+    DCHECK(index == object_wait_reqs->wait_requests.size());
     /* Remove the array of wait requests for this object, since no one should be
      * waiting for this object anymore. */
     HASH_DELETE(hh, *object_wait_requests_table_ptr, object_wait_reqs);
-    utarray_free(object_wait_reqs->wait_requests);
-    free(object_wait_reqs);
+    delete object_wait_reqs;
   }
 }
 
@@ -612,13 +602,11 @@ void PlasmaManagerState_free(PlasmaManagerState *state) {
   ObjectWaitRequests *wait_reqs, *tmp_wait_reqs;
   HASH_ITER(hh, state->object_wait_requests_local, wait_reqs, tmp_wait_reqs) {
     HASH_DELETE(hh, state->object_wait_requests_local, wait_reqs);
-    utarray_free(wait_reqs->wait_requests);
-    free(wait_reqs);
+    delete wait_reqs;
   }
   HASH_ITER(hh, state->object_wait_requests_remote, wait_reqs, tmp_wait_reqs) {
     HASH_DELETE(hh, state->object_wait_requests_remote, wait_reqs);
-    utarray_free(wait_reqs->wait_requests);
-    free(wait_reqs);
+    delete wait_reqs;
   }
 
   ARROW_CHECK_OK(state->plasma_conn->Disconnect());