solved conflict when merging branch

Makefile.am

@@ -6,7 +6,7 @@ TESTS =
 EXTRA_DIST = prepare.sh
 
 AM_CPPFLAGS = -I$(top_srcdir)/include
-AM_CFLAGS =
+AM_CFLAGS   = 
 AM_CXXFLAGS = $(AM_CFLAGS)
 
 lib_LTLIBRARIES = src/libmobject-store.la
@@ -25,3 +25,4 @@ include Make.rules
 
 include $(top_srcdir)/src/Makefile.subdir
 include $(top_srcdir)/tests/Makefile.subdir
+include $(top_srcdir)/tests/io-chain/Makefile.subdir

include/libmobject-store.h

@@ -79,6 +79,9 @@ enum {
 };
 /** @} */
 
+#define LIBMOBJECT_CREATE_EXCLUSIVE 1
+#define LIBMOBJECT_CREATE_IDEMPOTENT 0
+
 /**
  * @typedef mobject_store_ioctx_t
  *
@@ -108,7 +111,7 @@ typedef void *mobject_store_ioctx_t;
  * mobject_store_read_op_omap_get_vals_by_keys(), mobject_store_omap_get_next(), and
  * mobject_store_omap_get_end().
  */
-typedef void *mobject_store_omap_iter_t;
+typedef struct mobject_store_omap_iter *mobject_store_omap_iter_t;
 
 /**
  * @typedef mobject_store_write_op_t
@@ -294,9 +297,9 @@ void mobject_store_write_op_write_full(mobject_store_write_op_t write_op,
  */
 void mobject_store_write_op_writesame(mobject_store_write_op_t write_op,
                                       const char *buffer,
-									  size_t data_len,
-									  size_t write_len,
-									  uint64_t offset);
+				      size_t data_len,
+				      size_t write_len,
+				      uint64_t offset);
 
 /**
  * Append to end of object.
@@ -305,8 +308,8 @@ void mobject_store_write_op_writesame(mobject_store_write_op_t write_op,
  * @param len length of buffer
  */
 void mobject_store_write_op_append(mobject_store_write_op_t write_op,
-		                           const char *buffer,
-								   size_t len);
+		                   const char *buffer,
+				   size_t len);
 /**
  * Remove object
  * @param write_op operation to add this action to
@@ -450,8 +453,8 @@ void mobject_store_read_op_read(mobject_store_read_op_t read_op,
  */
 void mobject_store_read_op_omap_get_keys(mobject_store_read_op_t read_op,
                                          const char *start_after,
-				                         uint64_t max_return,
-				                         mobject_store_omap_iter_t *iter,
+					 uint64_t max_return,
+					 mobject_store_omap_iter_t *iter,
                                          int *prval);
 
 /**

src/Makefile.subdir

@@ -8,7 +8,11 @@ src_libmobject_store_la_SOURCES = \
  src/prepare-write-op.c \
  src/prepare-read-op.c \
  src/write-op-visitor.c \
- src/read-op-visitor.c
+ src/read-op-visitor.c \
+ src/omap-iter-impl.c \
+ src/proc-omap-iter.c \
+ src/read-resp-impl.c \
+ src/proc-read-responses.c
 
 noinst_HEADERS += \
   src/log.h \
@@ -26,8 +30,13 @@ noinst_HEADERS += \
   src/buffer-union.h \
   src/args-write-actions.h \
   src/args-read-actions.h \
-  src/read-op-visitor.h
-
+  src/read-op-visitor.h \
+  src/buffer-union.h \
+  src/omap-iter-impl.h \
+  src/proc-omap-iter.h \
+  src/read-responses.h \
+  src/read-resp-impl.h \
+  src/proc-read-responses.h
 
 src_libmobject_store_server_la_SOURCES = \
 					 src/mobject-server.c

src/args-read-actions.h

@@ -11,8 +11,8 @@
 
 /**
  * This file contains a set of structures meant
- * to store arguments for write_op operations in
- * a buffer. Some of these structures are self-sufficiant.
+ * to store arguments for read_op operations in
+ * a buffer. Some of these structures are self-sufficient.
  * Some other are meant to be used as headers, and the
  * the serialized buffer actually contains additional
  * data after them.

src/args-write-actions.h

@@ -12,7 +12,7 @@
 /**
  * This file contains a set of structures meant
  * to store arguments for write_op operations in
- * a buffer. Some of these structures are self-sufficiant.
+ * a buffer. Some of these structures are self-sufficient.
  * Some other are meant to be used as headers, and the
  * the serialized buffer actually contains additional
  * data after them.

src/buffer-union.h

@@ -6,6 +6,7 @@
 #ifndef __MOBJECT_BUFFER_UNION_H
 #define __MOBJECT_BUFFER_UNION_H
 
+#include <stdint.h>
 /**
  * This union is defined to be used in read and write actions
  * involving either a local pointer (const char*) or an offset

src/log.h

@@ -6,6 +6,8 @@
 #ifndef __MOBJECT_LOG_H
 #define __MOBJECT_LOG_H
 
+#include <stdio.h>
+
 #define STRINGIZE(x) STRINGIZE2(x)
 #define STRINGIZE2(x) #x
 #define LINE_STRING STRINGIZE(__LINE__)

src/omap-iter-impl.c

+/*
+ * (C) 2017 The University of Chicago
+ * 
+ * See COPYRIGHT in top-level directory.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "utlist.h"
+#include "libmobject-store.h"
+#include "omap-iter-impl.h"
+#include "log.h"
+
+void omap_iter_create(mobject_store_omap_iter_t* iter)
+{
+	*iter = (mobject_store_omap_iter_t)calloc(1, sizeof(**iter));
+	(*iter)->ref_count = 1;
+}
+
+void omap_iter_free(mobject_store_omap_iter_t iter)
+{
+	if(!iter) return;
+	iter->ref_count -= 1;
+	if(iter->ref_count > 0) return;
+
+	omap_iter_node_t elt, tmp;
+
+	DL_FOREACH_SAFE(iter->head, elt, tmp) {
+		DL_DELETE(iter->head, elt);
+		free((void*)(elt->key));
+		free((void*)(elt->value));
+		free((void*)(elt));
+	}
+
+	free(iter);
+}
+
+void omap_iter_incr_ref(mobject_store_omap_iter_t iter)
+{
+	if(!iter) return;
+	iter->ref_count += 1;
+}
+
+void omap_iter_append(mobject_store_omap_iter_t iter, 
+                      const char* key, const char* val, 
+                      size_t val_size)
+{
+	MOBJECT_ASSERT(iter, "trying to append to a NULL iterator");
+
+	omap_iter_node_t item = (omap_iter_node_t)calloc(1, sizeof(*item));
+	item->key             = strdup(key);
+	item->key_size        = strlen(key)+1;
+	item->value_size      = val_size;
+	item->value           = (char*)malloc(val_size);
+	memcpy(item->value, val, val_size);
+
+	DL_APPEND(iter->head, item);
+
+	if(iter->current == NULL)
+		iter->current = iter->head;
+
+	iter->num_items += 1;
+}
+
+int mobject_store_omap_get_next(mobject_store_omap_iter_t iter,
+                                char **key,
+                                char **val,
+                                size_t *len)
+{
+	if(iter->current == NULL) return -1;
+
+	*key = iter->current->key;
+	*val = iter->current->value;
+	*len = iter->current->value_size;
+
+	iter->current = iter->current->next;
+
+	return 0;
+}
+
+void mobject_store_omap_get_end(mobject_store_omap_iter_t iter)
+{
+	omap_iter_free(iter);	
+}

src/omap-iter-impl.h

+/*
+ * (C) 2017 The University of Chicago
+ * 
+ * See COPYRIGHT in top-level directory.
+ */
+#ifndef __MOBJECT_OMAP_ITER_H
+#define __MOBJECT_OMAP_ITER_H
+
+#include "libmobject-store.h"
+
+typedef struct omap_iter_node* omap_iter_node_t;
+
+struct omap_iter_node {
+	char*            key;
+	char*            value;
+	size_t           key_size;
+	size_t           value_size;
+	omap_iter_node_t prev, next; 
+};
+
+struct mobject_store_omap_iter {
+	size_t           num_items;
+	size_t           ref_count;
+	omap_iter_node_t head;
+	omap_iter_node_t current;
+};
+
+void omap_iter_create(mobject_store_omap_iter_t* iter);
+
+void omap_iter_incr_ref(mobject_store_omap_iter_t iter);
+
+void omap_iter_free(mobject_store_omap_iter_t iter);
+
+void omap_iter_append(mobject_store_omap_iter_t iter, 
+                      const char* key, const char* val, 
+                      size_t val_size);
+
+#endif

src/prepare-read-op.c

@@ -16,7 +16,10 @@ static void prepare_read(uint64_t* cur_offset,
 void prepare_read_op(margo_instance_id mid, mobject_store_read_op_t read_op) 
 {
 	if(read_op->ready == 1) return;
-	if(read_op->num_actions == 0) return;	
+	if(read_op->num_actions == 0) {
+		read_op->ready = 1;
+		return;
+	}
 
 	rd_action_base_t action;
 

src/prepare-write-op.c

@@ -31,7 +31,10 @@ static void convert_append(uint64_t* cur_offset,
 void prepare_write_op(margo_instance_id mid, mobject_store_write_op_t write_op) 
 {
 	if(write_op->ready == 1) return;
-	if(write_op->num_actions == 0) return;	
+	if(write_op->num_actions == 0) {
+		write_op->ready = 1;
+		return;
+	}	
 
 	wr_action_base_t action;
 

src/proc-omap-iter.c

+/*
+ * (C) 2017 The University of Chicago
+ * 
+ * See COPYRIGHT in top-level directory.
+ */
+#include <margo.h>
+#include "utlist.h"
+#include "proc-omap-iter.h"
+
+hg_return_t hg_proc_mobject_store_omap_iter_t(hg_proc_t proc, mobject_store_omap_iter_t* iter)
+{
+	omap_iter_node_t node;	
+	hg_return_t ret = HG_SUCCESS;
+
+	switch(hg_proc_get_op(proc)) {
+
+	case HG_ENCODE:
+
+		ret = hg_proc_hg_size_t(proc, &((*iter)->num_items));
+		if(ret != HG_SUCCESS) return ret;
+	
+		DL_FOREACH((*iter)->head, node) {
+			ret = hg_proc_hg_size_t(proc, &(node->key_size));
+			if(ret != HG_SUCCESS) return ret;
+			ret = hg_proc_memcpy(proc, &(node->key), node->key_size);
+			if(ret != HG_SUCCESS) return ret;
+			ret = hg_proc_hg_size_t(proc, &(node->value_size));
+			if(ret != HG_SUCCESS) return ret;
+			ret = hg_proc_memcpy(proc, node->value, node->value_size);
+			if(ret != HG_SUCCESS) return ret;
+		}
+
+		break;
+
+	case HG_DECODE:
+
+		omap_iter_create(iter);
+		ret = hg_proc_hg_size_t(proc, &((*iter)->num_items));
+		if(ret != HG_SUCCESS) return ret;
+
+		unsigned i;
+		size_t key_size, val_size;
+		char*  key;
+		char*  val;
+		for(i = 0; i < (*iter)->num_items; i++) {
+			ret = hg_proc_hg_size_t(proc, &key_size);
+			key = (char*)malloc(key_size);
+			ret = hg_proc_memcpy(proc, key, key_size);
+			if(ret != HG_SUCCESS) return ret;
+			ret = hg_proc_hg_size_t(proc, &val_size);
+			if(ret != HG_SUCCESS) return ret;
+			val - (char*)malloc(val_size);
+			ret = hg_proc_memcpy(proc, val, val_size);
+			omap_iter_append(*iter, key, val, val_size);
+		}
+
+		break;
+
+	case HG_FREE:
+
+		omap_iter_free(*iter);
+
+		break;
+	}
+	return HG_SUCCESS;
+}

src/proc-omap-iter.h

+/*
+ * (C) 2017 The University of Chicago
+ * 
+ * See COPYRIGHT in top-level directory.
+ */
+#ifndef __MOBJECT_PROC_OMAP_ITER_H
+#define __MOBJECT_PROC_OMAP_ITER_H
+
+#include "omap-iter-impl.h"
+
+hg_return_t hg_proc_mobject_store_omap_iter_t(hg_proc_t proc, mobject_store_omap_iter_t* iter);
+
+#endif

src/proc-read-actions.c

@@ -113,7 +113,7 @@ hg_return_t hg_proc_mobject_store_read_op_t(hg_proc_t proc, mobject_store_read_o
 		// for each action ...
 		DL_FOREACH((*read_op)->actions,elem) {
 			read_op_code_t opcode = elem->type;
-			MOBJECT_ASSERT((opcode <= 0 || opcode >= _READ_OPCODE_END_ENUM_),
+			MOBJECT_ASSERT((opcode > 0 || opcode < _READ_OPCODE_END_ENUM_),
 				"Invalid read_op opcode");
 			// encode the type of action
 			ret = hg_proc_memcpy(proc, &opcode, sizeof(opcode));
@@ -143,11 +143,12 @@ hg_return_t hg_proc_mobject_store_read_op_t(hg_proc_t proc, mobject_store_read_o
 			read_op_code_t opcode;
 			ret = hg_proc_memcpy(proc, &opcode, sizeof(opcode));
 			if(ret != HG_SUCCESS) return ret;
-			MOBJECT_ASSERT((opcode <= 0 || opcode >= _READ_OPCODE_END_ENUM_),
+			MOBJECT_ASSERT((opcode > 0 || opcode < _READ_OPCODE_END_ENUM_),
 				"Invalid write_op opcode");
 			// decode the action's arguments
 			ret = decode_read_action[opcode](proc, &position, &next_action);
 			if(ret != HG_SUCCESS) return ret;
+			next_action->type = opcode;
 			// append to the list
 			DL_APPEND((*read_op)->actions, next_action);
 		}
@@ -189,7 +190,7 @@ static hg_return_t encode_read_action_read(hg_proc_t proc,
 	args_rd_action_read a;
 	a.offset      = action->offset;
 	a.len         = action->len;
-    a.bulk_offset = action->buffer.as_offset;
+	a.bulk_offset = action->buffer.as_offset;
 	*pos         += a.len;
 	return hg_proc_memcpy(proc, &a, sizeof(a));
 }
@@ -276,10 +277,10 @@ static hg_return_t decode_read_action_omap_get_vals(hg_proc_t proc,
 	(*action)->max_return  = a.max_return;
 	(*action)->data_size   = a.data_size;
 	(*action)->start_after = (*action)->data;
-	size_t s = strlen((*action)->start_after);
-	(*action)->filter_prefix = (*action)->data + s + 1;
 
 	ret = hg_proc_memcpy(proc, (*action)->data, (*action)->data_size);
+	size_t s = strlen((*action)->start_after);
+	(*action)->filter_prefix = (*action)->data + s + 1;
 
 	return ret;
 }

src/proc-read-responses.c

+/*
+ * (C) 2017 The University of Chicago
+ * 
+ * See COPYRIGHT in top-level directory.
+ */
+#include <mercury_proc.h>
+#include "proc-read-responses.h"
+#include "read-responses.h"
+#include "read-resp-impl.h"
+#include "proc-omap-iter.h"
+#include "utlist.h"
+#include "log.h"
+
+typedef hg_return_t (*encode_fn)(hg_proc_t, void*);
+typedef hg_return_t (*decode_fn)(hg_proc_t, void*);
+
+static hg_return_t encode_stat_response(hg_proc_t proc, rd_response_stat_t  r);
+static hg_return_t decode_stat_response(hg_proc_t proc, rd_response_stat_t* r);
+static hg_return_t encode_read_response(hg_proc_t proc, rd_response_read_t  r);
+static hg_return_t decode_read_response(hg_proc_t proc, rd_response_read_t* r);
+static hg_return_t encode_omap_response(hg_proc_t proc, rd_response_omap_t  r);
+static hg_return_t decode_omap_response(hg_proc_t proc, rd_response_omap_t* r);
+
+static encode_fn encode[] = {
+	NULL,
+	(encode_fn)encode_stat_response,
+	(encode_fn)encode_read_response,
+	(encode_fn)encode_omap_response
+};
+
+static decode_fn decode[] = {
+	NULL,
+	(decode_fn)decode_stat_response,
+	(decode_fn)decode_read_response,
+	(decode_fn)decode_omap_response
+};
+
+hg_return_t hg_proc_read_response_t(hg_proc_t proc, read_response_t* response)
+{
+	hg_return_t ret = HG_SUCCESS;
+	rd_response_base_t elem;
+
+	switch(hg_proc_get_op(proc)) {
+
+	case HG_ENCODE:
+		// encode the number of actions
+		ret = hg_proc_memcpy(proc, &((*response)->num_responses),
+				sizeof((*response)->num_responses));
+		if(ret != HG_SUCCESS) return ret;
+
+		DL_FOREACH((*response)->responses,elem) {
+			read_resp_code_t opcode = elem->type;
+			MOBJECT_ASSERT((opcode > 0 || opcode < _READ_RESPCODE_END_ENUM_),
+					"Invalid response code");
+			// encode the type of response
+			ret = hg_proc_memcpy(proc, &opcode, sizeof(opcode));
+			if(ret != HG_SUCCESS) return ret;
+			// encode the response's arguments
+			ret = encode[opcode](proc, elem);
+			if(ret != HG_SUCCESS) return ret;
+		}
+
+		break;
+	case HG_DECODE:
+		// allocate the response chain
+		*response = (read_response_t)calloc(1, sizeof(**response));
+		// decode the number of responses in the chain
+		ret = hg_proc_memcpy(proc, &((*response)->num_responses), sizeof((*response)->num_responses));
+		if(ret != HG_SUCCESS) return ret;
+
+		size_t i;
+		rd_response_base_t next_resp;
+		for(i = 0; i < (*response)->num_responses; i++) {
+			// decode the current response's type
+			read_resp_code_t opcode;
+			ret = hg_proc_memcpy(proc, &opcode, sizeof(opcode));
+			if(ret != HG_SUCCESS) return ret;
+			MOBJECT_ASSERT((opcode > 0 || opcode < _READ_RESPCODE_END_ENUM_),
+				"Invalid write_op opcode");
+			// decode the response's arguments
+			ret = decode[opcode](proc, &next_resp);
+			if(ret != HG_SUCCESS) return ret;
+			next_resp->type = opcode;
+			// append to the list
+			DL_APPEND((*response)->responses, next_resp);
+		}
+		
+		break;
+	case HG_FREE:
+
+		free_read_responses(*response);
+		break;
+	}
+
+	return ret;
+}
+
+hg_return_t encode_stat_response(hg_proc_t proc, rd_response_stat_t  r)
+{
+	hg_return_t ret;
+	ret = hg_proc_uint64_t(proc, &(r->psize));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_memcpy(proc, &(r->pmtime), sizeof(r->pmtime));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_memcpy(proc, &(r->prval), sizeof(r->prval));
+	return ret;
+}
+
+hg_return_t decode_stat_response(hg_proc_t proc, rd_response_stat_t* r)
+{
+	*r = (rd_response_stat_t)calloc(1, sizeof(**r));
+	
+	hg_return_t ret;
+	ret = hg_proc_uint64_t(proc, &((*r)->psize));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_memcpy(proc, &((*r)->pmtime), sizeof((*r)->pmtime));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_memcpy(proc, &((*r)->prval), sizeof((*r)->prval));
+	return ret;
+}
+
+hg_return_t encode_read_response(hg_proc_t proc, rd_response_read_t  r)
+{
+	hg_return_t ret;
+	ret = hg_proc_hg_size_t(proc, &(r->bytes_read));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_memcpy(proc, &(r->prval), sizeof(r->prval));
+	return ret;
+}
+
+hg_return_t decode_read_response(hg_proc_t proc, rd_response_read_t* r)
+{
+	*r = (rd_response_read_t)calloc(1, sizeof(**r));
+
+	hg_return_t ret;
+	ret = hg_proc_hg_size_t(proc, &((*r)->bytes_read));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_memcpy(proc, &((*r)->prval), sizeof((*r)->prval));
+	return ret;
+
+}
+
+hg_return_t encode_omap_response(hg_proc_t proc, rd_response_omap_t  r)
+{
+	hg_return_t ret;
+	ret = hg_proc_memcpy(proc, &(r->prval), sizeof(r->prval));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_mobject_store_omap_iter_t(proc, &(r->iter));
+	if(ret != HG_SUCCESS) return ret;
+}
+
+hg_return_t decode_omap_response(hg_proc_t proc, rd_response_omap_t* r)
+{
+	*r = (rd_response_omap_t)calloc(1, sizeof(**r));
+
+	hg_return_t ret;
+	ret = hg_proc_memcpy(proc, &((*r)->prval), sizeof((*r)->prval));
+	if(ret != HG_SUCCESS) return ret;
+	ret = hg_proc_mobject_store_omap_iter_t(proc, &((*r)->iter));
+	if(ret != HG_SUCCESS) return ret;
+}

src/proc-read-responses.h

+/*
+ * (C) 2017 The University of Chicago
+ * 
+ * See COPYRIGHT in top-level directory.
+ */
+#ifndef __MOBJECT_PROC_READ_RESPONSE_H
+#define __MOBJECT_PROC_READ_RESPONSE_H
+
+#include <margo.h>
+#include "read-resp-impl.h"
+
+hg_return_t hg_proc_read_response_t(hg_proc_t proc, read_response_t* response);
+
+#endif

src/proc-write-actions.c

@@ -163,7 +163,7 @@ hg_return_t hg_proc_mobject_store_write_op_t(hg_proc_t proc, mobject_store_write
 		// for each action ...
 		DL_FOREACH((*write_op)->actions,elem) {
 			write_op_code_t opcode = elem->type;
-			MOBJECT_ASSERT((opcode <= 0 || opcode >= _WRITE_OPCODE_END_ENUM_), 
+			MOBJECT_ASSERT((opcode > 0 && opcode < _WRITE_OPCODE_END_ENUM_), 
 				"Invalid write_op opcode");
 			// encode the type of action
 			ret = hg_proc_memcpy(proc, &opcode, sizeof(opcode));
@@ -194,11 +194,12 @@ hg_return_t hg_proc_mobject_store_write_op_t(hg_proc_t proc, mobject_store_write
 			write_op_code_t opcode;
 			ret = hg_proc_memcpy(proc, &opcode, sizeof(opcode));
 			if(ret != HG_SUCCESS) return ret;
-			MOBJECT_ASSERT((opcode <= 0 || opcode >= _WRITE_OPCODE_END_ENUM_), 
+			MOBJECT_ASSERT((opcode > 0 && opcode < _WRITE_OPCODE_END_ENUM_), 
 				"Invalid write_op opcode");
 			// decode the action's arguments
 			ret = decode_write_action[opcode](proc, &position, &next_action);
 			if(ret != HG_SUCCESS) return ret;
+			next_action->type = opcode;
 			// append to the list
 			DL_APPEND((*write_op)->actions, next_action);
 		}

src/read-actions.h

@@ -7,6 +7,7 @@
 #define __MOBJECT_READ_OPCODES_H
 
 #include "mobject-store-config.h"
+#include "libmobject-store.h"
 #include "buffer-union.h"
 
 typedef enum {
@@ -65,9 +66,9 @@ typedef struct rd_action_OMAP_GET_VALS {
 	struct rd_action_BASE base;
 	const char*           start_after;
 	const char*           filter_prefix;
-    uint64_t              max_return;
-    mobject_store_omap_iter_t* iter;
-    int*                  prval;
+	uint64_t              max_return;
+	mobject_store_omap_iter_t* iter;
+	int*                  prval;
 	size_t                data_size;
 	char                  data[1];
 }* rd_action_omap_get_vals_t;

src/read-op-visitor.c

@@ -8,13 +8,13 @@
 #include "read-op-impl.h"
 #include "utlist.h"
 
-static void execute_read_op_visitor_on_stat(read_op_visitor_t visitor, rd_action_stat_t a);
-static void execute_read_op_visitor_on_read(read_op_visitor_t visitor, rd_action_read_t a);
-static void execute_read_op_visitor_on_omap_get_keys(read_op_visitor_t visitor, rd_action_omap_get_keys_t a);
-static void execute_read_op_visitor_on_omap_get_vals(read_op_visitor_t visitor, rd_action_omap_get_vals_t a);
-static void execute_read_op_visitor_on_omap_get_vals_by_keys(read_op_visitor_t visitor, rd_action_omap_get_vals_by_keys_t a);
+static void execute_read_op_visitor_on_stat(read_op_visitor_t visitor, rd_action_stat_t a, void* uargs);
+static void execute_read_op_visitor_on_read(read_op_visitor_t visitor, rd_action_read_t a, void* uargs);
+static void execute_read_op_visitor_on_omap_get_keys(read_op_visitor_t visitor, rd_action_omap_get_keys_t a, void* uargs);
+static void execute_read_op_visitor_on_omap_get_vals(read_op_visitor_t visitor, rd_action_omap_get_vals_t a, void* uargs);
+static void execute_read_op_visitor_on_omap_get_vals_by_keys(read_op_visitor_t visitor, rd_action_omap_get_vals_by_keys_t a, void* uargs);
 
-typedef void (*dispatch_fn)(read_op_visitor_t, rd_action_base_t);
+typedef void (*dispatch_fn)(read_op_visitor_t, rd_action_base_t, void*);
 
 static dispatch_fn visitor_dispatch[_READ_OPCODE_END_ENUM_] = {
 	NULL,
@@ -25,15 +25,14 @@ static dispatch_fn visitor_dispatch[_READ_OPCODE_END_ENUM_] = {
 	(dispatch_fn)execute_read_op_visitor_on_omap_get_vals_by_keys,
 };
 
-void execute_read_op_visitor(read_op_visitor_t visitor, mobject_store_read_op_t read_op)
+void execute_read_op_visitor(read_op_visitor_t visitor, mobject_store_read_op_t read_op, void* uargs)
 {
-	void* uargs = visitor->uargs;
 	rd_action_base_t a;
 
 	visitor->visit_begin(uargs);
 	
 	DL_FOREACH((read_op->actions), a) {
-		visitor_dispatch[a->type](visitor, a);
+		visitor_dispatch[a->type](visitor, a, uargs);
 	}
 
 	visitor->visit_end(uargs);
@@ -43,28 +42,34 @@ void execute_read_op_visitor(read_op_visitor_t visitor, mobject_store_read_op_t
 //                          STATIC FUNCTIONS BELOW                            //
 ////////////////////////////////////////////////////////////////////////////////
 
-static void execute_read_op_visitor_on_stat(read_op_visitor_t visitor, rd_action_stat_t a)
+static void execute_read_op_visitor_on_stat(read_op_visitor_t visitor, rd_action_stat_t a, void* uargs)
 {
-	visitor->visit_stat(visitor->uargs, a->psize, a->pmtime, a->prval);
+	if(visitor->visit_stat)
+		visitor->visit_stat(uargs, a->psize, a->pmtime, a->prval);
 }
 
-static void execute_read_op_visitor_on_read(read_op_visitor_t visitor, rd_action_read_t a)
+static void execute_read_op_visitor_on_read(read_op_visitor_t visitor, rd_action_read_t a, void* uargs)
 {
-	visitor->visit_read(visitor->uargs, a->offset, a->len, a->buffer, a->bytes_read, a->prval);
+	if(visitor->visit_read)
+		visitor->visit_read(uargs, a->offset, a->len, a->buffer, a->bytes_read, a->prval);
 }
 
-static void execute_read_op_visitor_on_omap_get_keys(read_op_visitor_t visitor, rd_action_omap_get_keys_t a)
+static void execute_read_op_visitor_on_omap_get_keys(read_op_visitor_t visitor, rd_action_omap_get_keys_t a, void* uargs)
 {
-	visitor->visit_omap_get_keys(visitor->uargs, a->start_after, a->max_return, a->iter, a->prval);
+	if(visitor->visit_omap_get_keys)
+		visitor->visit_omap_get_keys(uargs, a->start_after, a->max_return, a->iter, a->prval);
 }
 
-static void execute_read_op_visitor_on_omap_get_vals(read_op_visitor_t visitor, rd_action_omap_get_vals_t a)
+static void execute_read_op_visitor_on_omap_get_vals(read_op_visitor_t visitor, rd_action_omap_get_vals_t a, void* uargs)
 {
-	visitor->visit_omap_get_vals(visitor->uargs, a->start_after, a->filter_prefix, a->max_return, a->iter, a->prval);
+	if(visitor->visit_omap_get_vals)
+		visitor->visit_omap_get_vals(uargs, a->start_after, a->filter_prefix, a->max_return, a->iter, a->prval);
 }
 
-static void execute_read_op_visitor_on_omap_get_vals_by_keys(read_op_visitor_t visitor, rd_action_omap_get_vals_by_keys_t a)
+static void execute_read_op_visitor_on_omap_get_vals_by_keys(read_op_visitor_t visitor, rd_action_omap_get_vals_by_keys_t a, void* uargs)
 {
+	if(visitor->visit_omap_get_vals_by_keys == NULL) return;
+
 	const char* keys[a->num_keys];