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mod_java: Allow user defined java methods to be called at startup and shutdown of JVM (MODLANG-117)

This commit is contained in:
Michael Jerris 2010-05-31 10:15:35 -04:00
parent e4450044d7
commit 1339e2185f
2 changed files with 116 additions and 8 deletions
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2
conf/autoload_configs/java.conf.xml
View File

@ -8,4 +8,6 @@
<!-- Enable remote debugging -->
<option value="-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=127.0.0.1:8000"/>
</options>
<startup class="net/cog/fs/system/Control" method="startup" arg="start up arg"/>
<shutdown class="net/cog/fs/system/Control" method="shutdown" arg="shutdown arg"/>
</configuration>

122
src/mod/languages/mod_java/modjava.c
View File

@ -44,6 +44,21 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_java_load);
SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_java_shutdown);
SWITCH_MODULE_DEFINITION(mod_java, mod_java_load, mod_java_shutdown, NULL);
struct user_method {
const char * class;
const char * method;
const char * arg;
};
typedef struct user_method user_method_t;
struct vm_control {
struct user_method startup;
struct user_method shutdown;
};
typedef struct vm_control vm_control_t;
static vm_control_t vmControl;
static void launch_java(switch_core_session_t *session, const char *data, JNIEnv *env)
{
@ -93,6 +108,67 @@ done:
(*env)->DeleteLocalRef(env, Launcher);
}
static switch_status_t exec_user_method(user_method_t * userMethod) {
switch_status_t status = SWITCH_STATUS_SUCCESS;
jclass class = NULL;
jmethodID method = NULL;
jstring arg = NULL;
JNIEnv *env;
jint res;
if (javaVM == NULL || userMethod->class == NULL) {
return status;
}
res = (*javaVM)->AttachCurrentThread(javaVM, (void*) &env, NULL);
if (res != JNI_OK) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error attaching thread to Java VM!\n");
(*env)->ExceptionDescribe(env);
status = SWITCH_STATUS_FALSE;
goto done;
}
class = (*env)->FindClass(env, userMethod->class);
if (class == NULL) {
(*env)->ExceptionDescribe(env);
status = SWITCH_STATUS_FALSE;
goto done;
}
method = (*env)->GetStaticMethodID(env, class, userMethod->method, "(Ljava/lang/String;)V");
if (method == NULL) {
(*env)->ExceptionDescribe(env);
status = SWITCH_STATUS_FALSE;
goto done;
}
arg = (*env)->NewStringUTF(env, userMethod->arg);
if (arg == NULL) {
(*env)->ExceptionDescribe(env);
status = SWITCH_STATUS_FALSE;
goto done;
}
(*env)->CallStaticVoidMethod(env, class, method, arg);
if ((*env)->ExceptionOccurred(env)){
(*env)->ExceptionDescribe(env);
status = SWITCH_STATUS_FALSE;
}
done:
if (arg != NULL)
(*env)->DeleteLocalRef(env, arg);
if (class != NULL)
(*env)->DeleteLocalRef(env, class);
(*javaVM)->DetachCurrentThread(javaVM);
return status;
}
SWITCH_STANDARD_APP(java_function)
{
JNIEnv *env;
@ -111,7 +187,7 @@ SWITCH_STANDARD_APP(java_function)
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error attaching thread to Java VM!\n");
}
static switch_status_t load_config(JavaVMOption **javaOptions, int *optionCount)
static switch_status_t load_config(JavaVMOption **javaOptions, int *optionCount, vm_control_t * vmControl)
{
switch_xml_t cfg, xml;
switch_status_t status;
@ -121,6 +197,8 @@ static switch_status_t load_config(JavaVMOption **javaOptions, int *optionCount)
{
switch_xml_t javavm;
switch_xml_t options;
switch_xml_t startup;
switch_xml_t shutdown;
javavm = switch_xml_child(cfg, "javavm");
if (javavm != NULL)
@ -182,6 +260,25 @@ static switch_status_t load_config(JavaVMOption **javaOptions, int *optionCount)
(*javaOptions)[i].optionString = "-Djava.library.path=" SWITCH_PREFIX_DIR SWITCH_PATH_SEPARATOR "mod";
}
/*
<startup class="net/cog/fs/system/Control" method="startup" arg="start up arg"/>
<shutdown class="net/cog/fs/system/Control" method="shutdown" arg="shutdown arg"/>
*/
memset(vmControl, 0, sizeof(struct vm_control));
startup = switch_xml_child(cfg, "startup");
if (startup != NULL) {
vmControl->startup.class = switch_xml_attr_soft(startup, "class");
vmControl->startup.method = switch_xml_attr_soft(startup, "method");
vmControl->startup.arg = switch_xml_attr_soft(startup, "arg");
}
shutdown = switch_xml_child(cfg, "shutdown");
if (shutdown != NULL) {
vmControl->shutdown.class = switch_xml_attr_soft(shutdown, "class");
vmControl->shutdown.method = switch_xml_attr_soft(shutdown, "method");
vmControl->shutdown.arg = switch_xml_attr_soft(shutdown, "arg");
}
close:
switch_xml_free(xml);
}
@ -193,7 +290,7 @@ static switch_status_t load_config(JavaVMOption **javaOptions, int *optionCount)
return status;
}
static switch_status_t create_java_vm(JavaVMOption *options, int optionCount)
static switch_status_t create_java_vm(JavaVMOption *options, int optionCount, vm_control_t * vmControl)
{
jint (JNICALL *pJNI_CreateJavaVM)(JavaVM**,void**,void*);
switch_status_t status;
@ -235,6 +332,7 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_java_load)
{
switch_status_t status;
JavaVMOption *options = NULL;
int optionCount = 0;
switch_application_interface_t *app_interface;
@ -249,12 +347,19 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_java_load)
status = switch_core_new_memory_pool(&memoryPool);
if (status == SWITCH_STATUS_SUCCESS)
{
status = load_config(&options, &optionCount);
if (status == SWITCH_STATUS_SUCCESS)
{
status = create_java_vm(options, optionCount);
if (status == SWITCH_STATUS_SUCCESS)
return SWITCH_STATUS_SUCCESS;
status = load_config(&options, &optionCount, &vmControl);
if (status == SWITCH_STATUS_SUCCESS) {
status = create_java_vm(options, optionCount, &vmControl);
if (status == SWITCH_STATUS_SUCCESS) {
status = exec_user_method(&vmControl.startup);
if (status == SWITCH_STATUS_SUCCESS){
return SWITCH_STATUS_SUCCESS;
}
}
switch_dso_unload(javaVMHandle);
}
switch_core_destroy_memory_pool(&memoryPool);
@ -270,6 +375,7 @@ SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_java_shutdown)
if (javaVM == NULL)
return SWITCH_STATUS_FALSE;
exec_user_method(&vmControl.shutdown);
(*javaVM)->DestroyJavaVM(javaVM);
javaVM = NULL;
switch_dso_unload(javaVMHandle);