text: /*************************************************************************/
  /*  net_socket_android.cpp                                               */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "net_socket_android.h"
  
  #include "thread_jandroid.h"
  
  jobject NetSocketAndroid::net_utils = 0;
  jclass NetSocketAndroid::cls = 0;
  jmethodID NetSocketAndroid::_multicast_lock_acquire = 0;
  jmethodID NetSocketAndroid::_multicast_lock_release = 0;
  
  void NetSocketAndroid::setup(jobject p_net_utils) {
  
  	JNIEnv *env = ThreadAndroid::get_env();
  
  	net_utils = env->NewGlobalRef(p_net_utils);
  
  	jclass c = env->GetObjectClass(net_utils);
  	cls = (jclass)env->NewGlobalRef(c);
  
  	_multicast_lock_acquire = env->GetMethodID(cls, "multicastLockAcquire", "()V");
  	_multicast_lock_release = env->GetMethodID(cls, "multicastLockRelease", "()V");
  }
  
  void NetSocketAndroid::multicast_lock_acquire() {
  	if (_multicast_lock_acquire) {
  		JNIEnv *env = ThreadAndroid::get_env();
  		env->CallVoidMethod(net_utils, _multicast_lock_acquire);
  	}
  }
  
  void NetSocketAndroid::multicast_lock_release() {
  	if (_multicast_lock_release) {
  		JNIEnv *env = ThreadAndroid::get_env();
  		env->CallVoidMethod(net_utils, _multicast_lock_release);
  	}
  }
  
  NetSocket *NetSocketAndroid::_create_func() {
  	return memnew(NetSocketAndroid);
  }
  
  void NetSocketAndroid::make_default() {
  	_create = _create_func;
  }
  
  NetSocketAndroid::NetSocketAndroid() :
  		wants_broadcast(false),
  		multicast_groups(0) {
  }
  
  NetSocketAndroid::~NetSocketAndroid() {
  	close();
  }
  
  void NetSocketAndroid::close() {
  	NetSocketPosix::close();
  	if (wants_broadcast)
  		multicast_lock_release();
  	if (multicast_groups)
  		multicast_lock_release();
  	wants_broadcast = false;
  	multicast_groups = 0;
  }
  
  Error NetSocketAndroid::set_broadcasting_enabled(bool p_enabled) {
  	Error err = NetSocketPosix::set_broadcasting_enabled(p_enabled);
  	if (err != OK)
  		return err;
  
  	if (p_enabled != wants_broadcast) {
  		if (p_enabled) {
  			multicast_lock_acquire();
  		} else {
  			multicast_lock_release();
  		}
  
  		wants_broadcast = p_enabled;
  	}
  
  	return OK;
  }
  
  Error NetSocketAndroid::join_multicast_group(const IP_Address &p_multi_address, String p_if_name) {
  	Error err = NetSocketPosix::join_multicast_group(p_multi_address, p_if_name);
  	if (err != OK)
  		return err;
  
  	if (!multicast_groups)
  		multicast_lock_acquire();
  	multicast_groups++;
  
  	return OK;
  }
  
  Error NetSocketAndroid::leave_multicast_group(const IP_Address &p_multi_address, String p_if_name) {
  	Error err = NetSocketPosix::leave_multicast_group(p_multi_address, p_if_name);
  	if (err != OK)
  		return err;
  
  	ERR_FAIL_COND_V(multicast_groups == 0, ERR_BUG);
  
  	multicast_groups--;
  	if (!multicast_groups)
  		multicast_lock_release();
  
  	return OK;
  }
  