oci8 - Implementation of Oracle TAF Callback

Adds support for the Transparent Application Failover Callback.
The php_oci_connection struct got a char* added which will contain the
callback function, it should be set to PHP_OCI_TAF_DISABLE_CALLBACK at
the end of a php request for permanent connections so that, if a TAF
callback occurs, no userspace function will be called.
Maybe add support for registering object functions (via array),
currently the register function only accepts a string. I didn't know how
to implement it correctly. As a failover occurs very rarely it might be
better to not keep the cache when saving the zend_fcall_info.

Things to do
[ ] config.m4 needs to compile oci8_failover.c
[ ] Check if correctly implemented (especially for multithreading)
[ ] Add support for registering callback function via array

1 files changed, 9 insertions, 0 deletions

diff --git a/ext/oci8/php_oci8_int.h b/ext/oci8/php_oci8_int.h
index 61bb2750fa..06a88f4c84 100644
--- a/ext/oci8/php_oci8_int.h
+++ b/ext/oci8/php_oci8_int.h
@@ -164,6 +164,8 @@ typedef struct {
 #ifdef HAVE_OCI8_DTRACE
 	char		   *client_id;					/* The oci_set_client_identifier() value */
 #endif
+
+	zval		    taf_callback;				/* The Oracle TAF callback function in the userspace */
 } php_oci_connection;
 /* }}} */
 
@@ -531,6 +533,13 @@ ZEND_BEGIN_MODULE_GLOBALS(oci) /* {{{ Module globals */
 	char		*edition;
 ZEND_END_MODULE_GLOBALS(oci) /* }}} */
 
+/* {{{ transparent failover related prototypes */
+
+int php_oci_register_taf_callback(php_oci_connection *connection, zval *callback);
+int php_oci_disable_taf_callback(php_oci_connection *connection);
+
+/* }}} */
+
 #ifdef ZTS
 #define OCI_G(v) TSRMG(oci_globals_id, zend_oci_globals *, v)
 #else