src/bindings/java/jmsg_comm.c

   1 /* Functions related to the java comm instances                                                                                                                                 */
   2
   3 /* Copyright (c) 2012. The SimGrid Team. All rights reserved.                   */
   4 #include "jmsg_comm.h"
   5 #include "jxbt_utilities.h"
   6 #include "jmsg.h"
   7
   8 #include <msg/msg.h>
   9 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(jmsg);
  10
  11 static jfieldID jcomm_field_Comm_bind;
  12 static jfieldID jcomm_field_Comm_finished;
  13 static jfieldID jcomm_field_Comm_receiving;
  14 static jfieldID jtask_field_Comm_task;
  15 static jfieldID jcomm_field_Comm_taskBind;
  16
  17 void jcomm_bind_task(JNIEnv *env, jobject jcomm) {
  18   msg_comm_t comm = (msg_comm_t) (long) (*env)->GetLongField(env, jcomm, jcomm_field_Comm_bind);
  19   //test if we are receiving or sending a task.
  20   jboolean jreceiving = (*env)->GetBooleanField(env, jcomm, jcomm_field_Comm_receiving);
  21   if (jreceiving == JNI_TRUE) {
  22     //bind the task object.
  23     msg_task_t task = MSG_comm_get_task(comm);
  24     xbt_assert(task != NULL, "Task is NULL");
  25     jobject jtask_global = MSG_task_get_data(task);
  26     //case where the data has already been retrieved
  27     if (jtask_global == NULL) {
  28       return;
  29     }
  30
  31     //Make sure the data will be correctly gc.
  32     jobject jtask_local = (*env)->NewLocalRef(env, jtask_global);
  33     (*env)->DeleteGlobalRef(env, jtask_global);
  34
  35     (*env)->SetObjectField(env, jcomm, jtask_field_Comm_task, jtask_local);
  36
  37     MSG_task_set_data(task, NULL);
  38   }
  39
  40 }
  41
  42 JNIEXPORT void JNICALL
  43 Java_org_simgrid_msg_Comm_nativeInit(JNIEnv *env, jclass cls) {
  44   jclass jfield_class_Comm = (*env)->FindClass(env, "org/simgrid/msg/Comm");
  45   if (!jfield_class_Comm) {
  46     jxbt_throw_native(env,bprintf("Can't find the org/simgrid/msg/Comm class."));
  47     return;
  48   }
  49   jcomm_field_Comm_bind = jxbt_get_jfield(env, jfield_class_Comm, "bind", "J");
  50   jcomm_field_Comm_taskBind  = jxbt_get_jfield(env, jfield_class_Comm, "taskBind", "J");
  51   jcomm_field_Comm_receiving = jxbt_get_jfield(env, jfield_class_Comm, "receiving", "Z");
  52   jtask_field_Comm_task = jxbt_get_jfield(env, jfield_class_Comm, "task", "Lorg/simgrid/msg/Task;");
  53   jcomm_field_Comm_finished = jxbt_get_jfield(env, jfield_class_Comm, "finished", "Z");
  54   if (!jcomm_field_Comm_bind || !jcomm_field_Comm_taskBind || !jcomm_field_Comm_receiving || !jtask_field_Comm_task || !jcomm_field_Comm_finished) {
  55     jxbt_throw_native(env,bprintf("Can't find some fields in Java class."));
  56   }
  57 }
  58
  59 JNIEXPORT void JNICALL
  60 Java_org_simgrid_msg_Comm_destroy(JNIEnv *env, jobject jcomm) {
  61   msg_comm_t comm;
  62   msg_task_t *task_received;
  63
  64   task_received = (msg_task_t*)  (long) (*env)->GetLongField(env, jcomm, jcomm_field_Comm_taskBind);
  65   xbt_free(task_received);
  66
  67   comm = (msg_comm_t) (long) (*env)->GetLongField(env, jcomm, jcomm_field_Comm_bind);
  68   MSG_comm_destroy(comm);
  69 }
  70
  71 JNIEXPORT jboolean JNICALL
  72 Java_org_simgrid_msg_Comm_test(JNIEnv *env, jobject jcomm) {
  73   msg_comm_t comm;
  74   comm = (msg_comm_t) (long) (*env)->GetLongField(env, jcomm, jcomm_field_Comm_bind);
  75
  76   jboolean finished = (*env)->GetBooleanField(env, jcomm, jcomm_field_Comm_finished);
  77   if (finished == JNI_TRUE) {
  78     return JNI_TRUE;
  79   }
  80
  81   if (!comm) {
  82     jxbt_throw_native(env,bprintf("comm is null"));
  83     return JNI_FALSE;
  84   }
  85
  86   if (MSG_comm_test(comm)) {
  87     msg_error_t status = MSG_comm_get_status(comm);
  88     if (status == MSG_OK) {
  89       jcomm_bind_task(env,jcomm);
  90       return JNI_TRUE;
  91     } else {
  92       //send the correct exception
  93       jmsg_throw_status(env,status);
  94     }
  95   }
  96   return JNI_FALSE;
  97 }
  98 JNIEXPORT void JNICALL
  99 Java_org_simgrid_msg_Comm_waitCompletion(JNIEnv *env, jobject jcomm, jdouble timeout) {
 100   msg_comm_t comm = (msg_comm_t) (long) (*env)->GetLongField(env, jcomm, jcomm_field_Comm_bind);
 101   if (!comm) {
 102     jxbt_throw_native(env,bprintf("comm is null"));
 103     return;
 104   }
 105
 106   jboolean finished = (*env)->GetBooleanField(env, jcomm, jcomm_field_Comm_finished);
 107   if (finished == JNI_TRUE) {
 108     return;
 109   }
 110
 111   msg_error_t status;
 112   status = MSG_comm_wait(comm,(double)timeout);
 113   (*env)->SetBooleanField(env, jcomm, jcomm_field_Comm_finished, JNI_TRUE);
 114   if (status == MSG_OK) {
 115     jcomm_bind_task(env,jcomm);
 116     return;
 117   }
 118   else {
 119     jmsg_throw_status(env,status);
 120   }
 121
 122 }