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JOYnr JavaScript libjoynr-js
/*global JSON: true */
/*jslint es5: true */
/*
* #%L
* %%
* Copyright (C) 2011 - 2015 BMW Car IT GmbH
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
define(
"joynr/messaging/routing/MessageRouter",
[
"global/Promise",
"joynr/system/DiagnosticTags",
"joynr/system/LoggerFactory",
"joynr/messaging/JoynrMessage",
"joynr/util/Typing",
"joynr/util/JSONSerializer",
],
function(Promise, DiagnosticTags, LoggerFactory, JoynrMessage, Typing, JSONSerializer) {
/**
* Message Router receives a message and forwards it to the correct endpoint, as looked up in the {@link RoutingTable}
*
* @constructor
* @name MessageRouter
*
* @param {Object}
* settings the settings object holding dependencies
* @param {RoutingTable}
* settings.routingTable
* @param {MessagingStubFactory}
* settings.messagingStubFactory
* @param {String}
* settings.myChannelId
* @param {Address} settings.incomingAddress
* @param {Address} settings.parentMessageRouterAddress
* @param {LocalStorage} settings.persistency - LocalStorage or another object implementing the same interface
* @param {TypeRegistry} settings.typeRegistry
*
* @classdesc The MessageRouter is a joynr internal interface. The Message
* Router receives messages from Message Receivers, and forwards them along using to the
* appropriate Address, either {@link ChannelAddress} for messages being
* sent to a joynr channel via HTTP, {@link BrowserAddress} for messages
* going to applications running within a seperate browser tab, or
* {@link InProcessAddress} for messages going to a dispatcher running
* within the same JavaScript scope as the MessageRouter.
*
* MessageRouter is part of the cluster controller, and is used for
* internal messaging only.
*/
function MessageRouter(settings) {
// TODO remote provider participants are registered by capabilitiesDirectory on lookup
// TODO local providers registered (using dispatcher as local endpoint) by capabilitiesDirectory on register
// TODO local replyCallers are registered (using dispatcher as local endpoint) when they are created
var that = this;
var log = LoggerFactory.getLogger("joynr/messaging/routing/MessageRouter");
var listener, routingProxy, messagingStub;
var queuedAddNextHopCalls = [], queuedRemoveNextHopCalls = [];
var routingTable = settings.initialRoutingTable || {};
var id = settings.joynrInstanceId;
var persistency = settings.persistency;
var incomingAddress = settings.incomingAddress;
var parentMessageRouterAddress = settings.parentMessageRouterAddress;
var typeRegistry = settings.typeRegistry;
// if (settings.routingTable === undefined) {
// throw new Error("routing table is undefined");
// }
if (settings.parentMessageRouterAddress !== undefined
&& settings.incomingAddress === undefined) {
throw new Error("incoming address is undefined");
}
if (settings.incomingAddress !== undefined
&& settings.parentMessageRouterAddress === undefined) {
throw new Error("parentMessageRouterAddress is undefined");
}
if (settings.messagingStubFactory === undefined) {
throw new Error("messaging stub factory is undefined");
}
if (settings.messageQueue === undefined) {
throw new Error("messageQueue is undefined");
}
/**
* @function MessageRouter#getStorageKey
*
* @param {String} participantId
*
* @returns {String}
*/
this.getStorageKey = function getStorageKey(participantId) {
return id + "_" + participantId.replace("/", ".");
};
/**
* @function MessageRouter#removeNextHop
*
* @param {String} participantId
*
* @returns {Promise} promise
*/
this.removeNextHop = function removeNextHop(participantId) {
routingTable[participantId] = undefined;
persistency.removeItem(that.getStorageKey(participantId));
var promise;
if (routingProxy !== undefined) {
promise = routingProxy.removeNextHop({
participantId : participantId
});
} else if (parentMessageRouterAddress !== undefined) {
promise = new Promise(function(resolve, reject) {
queuedRemoveNextHopCalls[queuedRemoveNextHopCalls.length] = {
participantId : participantId,
resolve : resolve,
reject : reject
};
});
} else {
promise = Promise.resolve();
}
return promise;
};
/**
* @function MessageRouter#addNextHopToParentRoutingTable
*
* @param {String} participantId
*
* @returns result
*/
this.addNextHopToParentRoutingTable =
function addNextHopToParentRoutingTable(participantId) {
var result;
if (Typing.getObjectType(incomingAddress) === "BrowserAddress") {
result = routingProxy.addNextHop({
participantId : participantId,
browserAddress : incomingAddress
});
} else if (Typing.getObjectType(incomingAddress) === "ChannelAddress") {
result = routingProxy.addNextHop({
participantId : participantId,
channelAddress : incomingAddress
});
} else if (Typing.getObjectType(incomingAddress) === "WebSocketAddress") {
result = routingProxy.addNextHop({
participantId : participantId,
webSocketAddress : incomingAddress
});
} else if (Typing.getObjectType(incomingAddress) === "WebSocketClientAddress") {
result = routingProxy.addNextHop({
participantId : participantId,
webSocketClientAddress : incomingAddress
});
} else if (Typing.getObjectType(incomingAddress) === "CommonApiDbusAddress") {
result = routingProxy.addNextHop({
participantId : participantId,
commonApiDbusAddress : incomingAddress
});
}
return result;
};
/**
* @function MessageRouter#setRoutingProxy
*
* @param {RoutingProxy} newRoutingproxy - the routing proxy to be set
*/
this.setRoutingProxy =
function setRoutingProxy(newRoutingProxy) {
var hop, participantId, errorFct;
errorFct = function(error) {
throw new Error(error);
};
routingProxy = newRoutingProxy;
if (routingProxy !== undefined) {
if (routingProxy.proxyParticipantId !== undefined) {
that.addNextHopToParentRoutingTable(
routingProxy.proxyParticipantId).catch(errorFct);
}
for (hop in queuedAddNextHopCalls) {
if (queuedAddNextHopCalls.hasOwnProperty(hop)) {
var queuedHopCall = queuedAddNextHopCalls[hop];
if (queuedHopCall.participantId !== routingProxy.proxyParticipantId) {
that.addNextHopToParentRoutingTable(
queuedHopCall.participantId).then(
queuedHopCall.resolve).catch(queuedHopCall.reject);
}
}
}
for (hop in queuedRemoveNextHopCalls) {
if (queuedRemoveNextHopCalls.hasOwnProperty(hop)) {
var queuedCall = queuedRemoveNextHopCalls[hop];
that.removeNextHop(queuedCall.participantId).then(
queuedCall.resolve).catch(queuedCall.reject);
}
}
}
queuedAddNextHopCalls = undefined;
queuedRemoveNextHopCalls = undefined;
};
/**
* Looks up an Address for a given participantId (next hop)
*
* @name MessageRouter#resolveNextHop
* @function
*
* @param {String}
* participantId
* @returns {InProcessAddress|BrowserAddress|ChannelAddress} the address of the next hop in the direction of the given
* participantId, or undefined if not found
*/
this.resolveNextHop = function resolveNextHop(participantId) {
var address, addressString;
address = routingTable[participantId];
if (address === undefined) {
addressString = persistency.getItem(that.getStorageKey(participantId));
if ((addressString === undefined
|| addressString === null || addressString === '{}')) {
persistency.removeItem(that.getStorageKey(participantId));
} else {
address = Typing.augmentTypes(JSON.parse(addressString), typeRegistry);
routingTable[participantId] = address;
}
}
if (address === undefined && routingProxy !== undefined) {
return routingProxy.resolveNextHop({
participantId : participantId
}).then(function(opArgs) {
if (opArgs.resolved) {
return parentMessageRouterAddress;
}
throw new Error("nextHop cannot be resolved, as participant with id "
+ participantId
+ " is not reachable by parent routing table");
});
}
return Promise.resolve(address);
};
/**
* @name MessageRouter#route
* @function
*
* @param {JoynrMessage}
* joynrMessage
* @returns {Object} A+ promise object
*/
this.route =
function route(joynrMessage) {
return that.resolveNextHop(joynrMessage.to).then(function(address) {
var errorMsg;
// Error: The participant is not registered yet.
// remote provider participants are registered by capabilitiesDirectory on lookup
// local providers are registered by capabilitiesDirectory on register
// replyCallers are registered when they are created
if (address === undefined) {
errorMsg =
"No message receiver found for participantId: "
+ joynrMessage.to
+ ". Queuing request message.";
log.info(errorMsg, DiagnosticTags
.forJoynrMessage(joynrMessage));
settings.messageQueue.putMessage(joynrMessage);
throw new Error(errorMsg);
} else {
messagingStub =
settings.messagingStubFactory
.createMessagingStub(address);
if (messagingStub === undefined) {
errorMsg =
"No message receiver found for participantId: "
+ joynrMessage.to
+ " queuing message.";
log.info(errorMsg, DiagnosticTags
.forJoynrMessage(joynrMessage));
throw new Error(errorMsg);
} else {
return messagingStub.transmit(joynrMessage);
}
}
});
};
/**
* Registers the next hop with this specific participant Id
*
* @name RoutingTable#addNextHop
* @function
*
* @param {String}
* participantId
* @param {InProcessAddress|BrowserAddress|ChannelAddress}
* address the address to register
*/
this.addNextHop =
function addNextHop(participantId, address) {
// store the address of the participantId persistently
routingTable[participantId] = address;
var serializedAddress = JSONSerializer.stringify(address);
var promise;
if ((serializedAddress === undefined
|| serializedAddress === null || serializedAddress === '{}')) {
log.info("registerNextHop: HOP address "
+ serializedAddress
+ " will not be persisted for participant id: "
+ participantId);
} else {
persistency.setItem(
that.getStorageKey(participantId),
serializedAddress);
}
if (routingProxy !== undefined) {
// register remotely
promise = that.addNextHopToParentRoutingTable(participantId);
} else {
if (parentMessageRouterAddress !== undefined) {
promise = new Promise(function(resolve, reject){
queuedAddNextHopCalls[queuedAddNextHopCalls.length] =
{
participantId : participantId,
resolve : resolve,
reject : reject
};
});
} else {
promise = Promise.resolve();
}
}
that.participantRegistered(participantId);
return promise;
};
/**
* @function MessageRouter#participantRegistered
*
* @param {String} participantId
*
* @returns {Promise} a Promise object
*/
this.participantRegistered =
function participantRegistered(participantId) {
var i, msgContainer, messageQueue =
settings.messageQueue.getAndRemoveMessages(participantId);
if (messageQueue !== undefined) {
i = messageQueue.length;
while (i--) {
that.route(messageQueue[i]);
}
}
};
}
return MessageRouter;
});
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