class JavaKernel(Kernel):
implementation = 'Python'
implementation_version = '1.0'
language = 'Java'
language_version = 'Java 9'
language_info = {'mimetype': 'text/plain', 'name':'Java'}
banner = "Java kernel for Jupyter"
def __init__(self, **kwargs):
super(JavaKernel, self).__init__(**kwargs)
port = 25222
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
while True:
result = sock.connect_ex(('127.0.0.1', port))
if result != 0:
break
port += 1
self.__sp = subprocess.Popen("java -jar " + sys.argv[1] + " " +
str(port), shell=True)
time.sleep(5)
self.history = deque(maxlen=256)
self.history_command = re.compile(r'^\s*/history\s*$')
self.__java_bridge = JavaGateway(
gateway_parameters=GatewayParameters(port=port)) \
.jvm.JShellWrapper()
def __last_word(self, var):
result = re.findall(r'\w+$', var)
return '' if not result else result[0]
def do_execute(self, code, silent, store_history=True,
user_expressions=None, allow_stdin=False):
if not silent:
self.history.append(code)
if self.history_command.match(code):
stream_content = {
'name': 'stdout',
'text': '\n'.join(self.history)
}
elif code == r'/vars':
stream_content = {
'name': 'stdout',
'text': self.__java_bridge.getVariables()
}
elif code == r'/methods':
stream_content = {
'name': 'stdout',
'text': self.__java_bridge.getMethods()
}
elif re.search(r'^/env .*', code) is not None:
path = re.sub(r'^/env *', "", code)
stream_content = {
'name': 'stdout',
'text': self.__java_bridge.addLibrary(path)
}
else:
stream_content = {
'name': 'stdout',
'text': self.__java_bridge.evalSnippet(code)
}
self.send_response(self.iopub_socket, 'stream', stream_content)
return {'status': 'ok',
'execution_count': self.execution_count,
'payload': [],
'user_expressions': {},
}
def do_is_complete(self, code):
if self.__java_bridge.isComplete(code):
return {"status": "complete"}
else:
return {"status": "incomplete", "indent": " "}
def do_complete(self, code, cursor_pos):
mask = self.__last_word(code)
if not mask:
v = []
else:
v = self.__java_bridge.getSuggestions(code, cursor_pos). \
split("\n")[:-1]
content = {
'matches': v,
'cursor_start': cursor_pos - len(mask),
'cursor_end': cursor_pos,
'metadata': {},
'status': 'ok'
}
return content
def do_shutdown(self, restart):
self.__sp.terminate()
