1 /* Functions related to the Virtual Machines. */
3 /* Copyright (c) 2012-2021. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "jxbt_utilities.hpp"
11 #include "simgrid/Exception.hpp"
12 #include "simgrid/plugins/live_migration.h"
13 #include "src/kernel/context/Context.hpp"
14 #include "src/plugins/vm/VirtualMachineImpl.hpp"
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(java);
18 extern int JAVA_HOST_LEVEL;
19 static jfieldID jvm_field_bind;
21 void jvm_bind(JNIEnv* env, jobject jvm, sg_vm_t vm)
23 env->SetLongField(jvm, jvm_field_bind, (intptr_t)vm);
26 sg_vm_t jvm_get_native(JNIEnv* env, jobject jvm)
28 return (sg_vm_t)(intptr_t)env->GetLongField(jvm, jvm_field_bind);
31 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_nativeInit(JNIEnv *env, jclass cls)
33 jclass jprocess_class_VM = env->FindClass("org/simgrid/msg/VM");
34 jvm_field_bind = jxbt_get_jfield(env, jprocess_class_VM, "bind", "J");
35 xbt_assert(jvm_field_bind, "Native initialization of msg/VM failed. Please report that bug");
38 JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_VM_isCreated(JNIEnv* env, jobject jvm)
40 const_sg_vm_t vm = jvm_get_native(env, jvm);
41 return sg_vm_is_created(vm);
44 JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_VM_isRunning(JNIEnv* env, jobject jvm)
46 const_sg_vm_t vm = jvm_get_native(env, jvm);
47 return sg_vm_is_running(vm);
50 JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_VM_isMigrating(JNIEnv* env, jobject jvm)
52 const_sg_vm_t vm = jvm_get_native(env, jvm);
53 return sg_vm_is_migrating(vm);
56 JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_VM_isSuspended(JNIEnv* env, jobject jvm)
58 const_sg_vm_t vm = jvm_get_native(env, jvm);
59 return sg_vm_is_suspended(vm);
62 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_setBound(JNIEnv *env, jobject jvm, jdouble bound)
64 sg_vm_t vm = jvm_get_native(env, jvm);
65 sg_vm_set_bound(vm, bound);
68 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_create(JNIEnv* env, jobject jVm, jobject jHost, jstring jname,
69 jint coreAmount, jint jramsize, jint jmig_netspeed,
72 sg_host_t host = jhost_get_native(env, jHost);
74 const char* name = env->GetStringUTFChars(jname, nullptr);
75 sg_vm_t vm = sg_vm_create_migratable(host, name, static_cast<int>(coreAmount), static_cast<int>(jramsize),
76 static_cast<int>(jmig_netspeed), static_cast<int>(jdp_intensity));
77 env->ReleaseStringUTFChars(jname, name);
79 jvm_bind(env, jVm, vm);
80 jVm = env->NewGlobalRef(jVm);
81 // We use the extension level of the host, even if that's somehow disturbing
82 vm->extension_set(JAVA_HOST_LEVEL, jVm);
85 JNIEXPORT jobjectArray JNICALL Java_org_simgrid_msg_VM_all(JNIEnv* env, jclass cls_arg)
87 sg_host_t* hosts = sg_host_list();
88 size_t host_count = sg_host_count();
89 std::vector<jobject> vms;
91 for (size_t i = 0; i < host_count; i++) {
92 const auto* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(hosts[i]);
93 if (vm != nullptr && vm->get_state() != simgrid::s4u::VirtualMachine::state::DESTROYED) {
94 auto jvm = static_cast<jobject>(vm->extension(JAVA_HOST_LEVEL));
101 int count = vms.size();
103 jclass cls = jxbt_get_class(env, "org/simgrid/msg/VM");
107 jobjectArray jtable = env->NewObjectArray((jsize)count, cls, nullptr);
109 jxbt_throw_jni(env, "Hosts table allocation failed");
113 for (int index = 0; index < count; index++) {
114 jobject jhost = vms.at(index);
115 env->SetObjectArrayElement(jtable, index, jhost);
120 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_nativeFinalize(JNIEnv *env, jobject jvm)
122 sg_vm_t vm = jvm_get_native(env, jvm);
126 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_start(JNIEnv *env, jobject jvm)
128 sg_vm_t vm = jvm_get_native(env, jvm);
132 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_shutdown(JNIEnv *env, jobject jvm)
134 sg_vm_t vm = jvm_get_native(env, jvm);
139 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_destroy(JNIEnv* env, jobject jvm)
141 sg_vm_t vm = jvm_get_native(env, jvm);
144 auto* vmList = &simgrid::vm::VirtualMachineImpl::allVms_;
145 vmList->erase(std::remove(vmList->begin(), vmList->end(), vm), vmList->end());
149 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_nativeMigration(JNIEnv* env, jobject jvm, jobject jhost)
151 sg_vm_t vm = jvm_get_native(env, jvm);
152 sg_host_t host = jhost_get_native(env, jhost);
153 if (not simgrid::ForcefulKillException::try_n_catch([&vm, &host]() { sg_vm_migrate(vm, host); })) {
154 XBT_VERB("Caught exception during migration");
155 jxbt_throw_host_failure(env, "during migration");
159 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_suspend(JNIEnv *env, jobject jvm)
161 sg_vm_t vm = jvm_get_native(env, jvm);
165 JNIEXPORT void JNICALL Java_org_simgrid_msg_VM_resume(JNIEnv *env, jobject jvm)
167 sg_vm_t vm = jvm_get_native(env, jvm);
171 JNIEXPORT jobject JNICALL Java_org_simgrid_msg_VM_getVMByName(JNIEnv* env, jclass cls, jstring jname)
173 /* get the C string from the java string */
174 if (jname == nullptr) {
175 jxbt_throw_null(env, "No VM can have a null name");
178 const char* name = env->GetStringUTFChars(jname, nullptr);
179 /* get the VM by name (VMs are just special hosts, unfortunately) */
180 auto const* host = sg_host_by_name(name);
182 if (not host) { /* invalid name */
183 jxbt_throw_host_not_found(env, name);
184 env->ReleaseStringUTFChars(jname, name);
187 env->ReleaseStringUTFChars(jname, name);
189 return static_cast<jobject>(host->extension(JAVA_HOST_LEVEL));