yentl
/
modelverse


			
				
					
						
						
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							<class name="MvKController">
    <relationships>
        <association name="to_mvi" class="Server" min="1" max="1"/>
    </relationships>
    <constructor>
        <parameter name="params"/>
        <body>
            <![CDATA[
            self.mvs = ModelverseState("../bootstrap/bootstrap.m")
            self.root = self.mvs.read_root()[0]
            self.mvk = ModelverseKernel(self.root)
            self.all_failed = False
            self.timeout = False

            self.users = set()
            self.input_queue = defaultdict(list)
            self.output_queue = defaultdict(list)
            self.source = None

            self.mvs_operations = {
                    "CN": self.mvs.create_node,
                    "CE": self.mvs.create_edge,
                    "CNV": self.mvs.create_nodevalue,
                    "CD": self.mvs.create_dict,

                    "RV": self.mvs.read_value,
                    "RO": self.mvs.read_outgoing,
                    "RI": self.mvs.read_incoming,
                    "RE": self.mvs.read_edge,
                    "RD": self.mvs.read_dict,
                    "RDN": self.mvs.read_dict_node,
                    "RDNE": self.mvs.read_dict_node_edge,
                    "RDE": self.mvs.read_dict_edge,
                    "RRD": self.mvs.read_reverse_dict,
                    "RR": self.mvs.read_root,
                    "RDK": self.mvs.read_dict_keys,

                    "DE": self.mvs.delete_edge,
                    "DN": self.mvs.delete_node,
                }

            self.execute_modelverse("", "load_primitives", [])
            ]]>
        </body>
    </constructor>

    <method name="execute_modelverse">
        <parameter name="username"/>
        <parameter name="operation"/>
        <parameter name="params"/>
        <body>
            <![CDATA[
            reply = None
            commands = []
            while 1:
                commands = self.mvk.execute_yields(username, operation, params, reply)
                if commands is None:
                    break
                reply = [self.mvs_operations[command[0]](*(command[1]))[0] for command in commands]
                if len(reply) == 1:
                    reply = reply[0]
            ]]>
        </body>
    </method>

    <scxml initial="init_server">
        <state id="init_server">
            <onentry>
                <raise scope="cd" event="create_instance">
                    <parameter expr="'to_mvi'"/>
                    <parameter expr="'Server'"/>
                    <parameter expr="''"/>
                    <parameter expr="8001"/>
                </raise>
            </onentry>
            <transition event="instance_created" target="../running">
                <parameter name="instancename"/>
                <raise scope="cd" event="start_instance">
                    <parameter expr="instancename"/>
                </raise>
            </transition>
        </state>

        <parallel id="running">
            <state id="wait_for_requests">
                <state id="wait">
                    <transition event="from_mvi" target=".">
                        <parameter name="source"/>
                        <parameter name="data"/>
                        <script>
                            # No JSON encoding necessary, as it is not complex
                            try:
                                if data["op"] == "set_input":
                                    if "element_type" in data:
                                        if data["element_type"] == "V":
                                            value = json.loads(data["value"])
                                        else:
                                            value = data["value"]
                                        args = [data["element_type"], value]
                                        self.input_queue[data["username"]].append((source, [args]))
                                    else:
                                        d = []
                                        for t, v in json.loads(data["data"]):
                                            if t == "V":
                                                v = json.loads(v)
                                            d.append([t, v])
                                        self.input_queue[data["username"]].append((source, d))
                                elif data["op"] == "get_output":
                                    self.output_queue[data["username"]].append(source)
                                else:
                                    print("DROPPING unknown operation: " + str(data["op"]))
                            except:
                                print("DROPPING deserialization error")
                        </script>
                    </transition>
                </state>
            </state>

            <state id="execution">
                <state id="execution">
                    <onentry>
                        <script>
                            self.timeout = False
                            self.destination = None
                            if self.users:
                                user = self.users.pop()

                                # Check if there are values to input
                                if self.input_queue[user]:
                                    source, args = self.input_queue[user].pop(0)
                                    for args_entry in args:
                                        self.execute_modelverse(user, "set_input", args_entry)

                                    self.destination = source
                                    self.value = {"id": 200, "value": "OK"}
                                    self.all_failed = False

                                # Now process for some steps, or until we are again blocked for input
                                for x in xrange(200):
                                    self.execute_modelverse(user, "execute_rule", [])

                                    if not self.mvk.success:
                                        # Blocking or broken, so quit already to stop wasting CPU
                                        break

                                    self.all_failed = False

                                # Check that we don't have anything to output yet, otherwise we wait
                                if self.destination is None:
                                    # Perform output if there is anything
                                    if self.output_queue[user]:
                                        self.execute_modelverse(user, "get_output", [])
                                        if self.mvk.success:
                                            self.destination = self.output_queue[user].pop(0)
                                            self.value = self.mvk.returnvalue
                                            self.all_failed = False
                            else:
                                out = self.mvs.read_outgoing(self.root)[0]
                                for m in out:
                                    src, user = self.mvs.read_edge(m)[0]
                                    outgoing = self.mvs.read_outgoing(m)[0]
                                    first = self.mvs.read_edge(outgoing[0])[0]
                                    dest = first[1]
                                    name = self.mvs.read_value(dest)[0]
                                    if name.startswith("__"):
                                        continue
                                    self.users.add(name)
                                self.timeout = self.all_failed
                                self.all_failed = True
                        </script>
                    </onentry>

                    <transition cond="self.destination is not None" after="0" target=".">
                        <raise event="HTTP_input" scope="narrow" target="'to_mvi/%s' % self.destination">
                            <parameter expr="self.value"/>
                        </raise>
                    </transition>

                    <transition cond="self.timeout and self.destination is None" after="0.1" target="."/>

                    <transition cond="not self.timeout and self.destination is None" after="0" target="."/>
                </state>
            </state>

            <state id="remove_sockets">
                <state id="remove_sockets">
                    <transition event="delete_socket" target=".">
                        <parameter name="socket"/>
                        <script>
                            for user in self.output_queue.keys():
                                self.output_queue[user] = [s for s in self.output_queue[user] if s != socket]
                        </script>
                    </transition>
                </state>
            </state>
        </parallel>
    </scxml>
</class>