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- For finding Storm blocks in a Tapestry overlay, we must create: |
- For finding Storm blocks in a Tapestry overlay, we must create: |
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- BlockIDTag class for Storm blocks' IDs (ostore.tapestry.api.TapestryTag) |
- BlockIDTag class for Storm blocks' IDs (implements |
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ostore.tapestry.api.TapestryTag) |
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- BlockIDQuery (implements ostore.tapestry.api.TapestryQuery) class is |
- BlockIDQuery (implements ostore.tapestry.api.TapestryQuery) class is |
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used in a StormLocateMsg class (and in ostore.tapestry.api.TapestryLocateMsg) |
used in a StormLocateMsg class (and in ostore.tapestry.api.TapestryLocateMsg) |
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to find objects identified by a BlockIDTag |
to find objects identified by a BlockIDTag |
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- StormLocateMsg class (extends ostore.tapestry.api.TapestryLocateMsg) |
- StormQueryMsg class (extends ostore.tapestry.api.TapestryLocateMsg) |
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- StormResponseMsg class |
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- For interacting Storm's storage model with Tapestry: |
- For interacting Storm's storage model with Tapestry: |
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- StormTapestryManager class which |
- StormTapestryManager class which |
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- registers Storm to handle Storm-related Tapestry events |
- registers Storm to handle Storm-related Tapestry events |
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- dispatches and handles Storm-related Tapestry events |
- dispatches and handles Storm-related Tapestry events |
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PSEUDOCODE for Storm |
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class StormTapestryManager implements EventHandlerIF { |
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// dispatcher which dispatch all items |
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// to target peer |
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method dispatch (QueueElementIF item) { |
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//try do dispatch an item |
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try { |
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classifier.dispatch(item); |
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} catch (expection) { |
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error("Could not dispatch item!") |
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} |
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} |
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// general initialization method |
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// that handles subscribes this stage |
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// to listen certain events and messages |
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method init (ConfigDataIF config) { |
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// find our NodeId |
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self_node_id = new NodeId |
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// initialize the appropriate |
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// instance of the Classifier. The Classifier handles the |
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// publish/subscribe mechanism used for |
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// event dispatch between stages. |
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classifier = Classifier.getClassifier(self_node_id = new NodeId) |
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// create peer ID based on peer's public key |
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_peer = new SHA1Hash (pkey); |
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// the *events* which we want to listen |
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array event_types = { |
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"seda.sandStorm.api.StormFooSignal1", |
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"seda.sandStorm.api.StormFooSignal2" |
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} |
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for (From i = 0 To numberOf(event_types)) { |
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classifier.subscribe (event_type[i]) |
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} |
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// the *messages* we want receive through Tapestry |
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array message_types = { |
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"ostore.apps.test.StormQueryMsg", |
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"ostore.apps.test.StormResponseMsg" |
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} |
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for (From i = 0 To numberOf(message_types)) { |
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// First, register messages we intend to |
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// receive |
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TypeTable.register_type(messages_types[i]) |
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// Second, we require that inbound field is |
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// set to true. Otherwise, we will see the messages that we |
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// send as well |
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classifier.subscribe (message_type[i], verifyInbound); |
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} |
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} |
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// handles *all* events which stage is listening |
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method handleEvents(QueueElementIF array items) |
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throws EventHandlerException { |
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for (from i=0 to length(items) |
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handleEvent(items[i]) |
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} |
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// handles single event for this stage. handleEvents |
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// method gives an item this method |
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method handleEvent(QueueElementIF item) { |
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if (item instanceof StormQueryMsg) { |
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handleStormQueryMsg(item) |
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} else if (item instanceof StormResponseMsg) { |
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handleStormResponseMsg(item) |
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} else { |
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handleOtherMsg(item) |
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} |
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} |
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// handles a certain type of event(StormQueryMsg) |
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method handleStormQueryMsg(item){ |
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results = performLocalSearch() |
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dispatch(results) |
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} |
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// handles a certain type of event(StormResponseMsg) |
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method handleStormResponseMsg(item){ |
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response = createResponse() |
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dispatch(response) |
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} |
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// createa a Storm query to a network |
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// Query tag is Storm block's GUID |
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method query(){ |
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blockTag = new BlockIDTag(blockGUID) |
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q = new StormQuery() |
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queryMsg= new StormQueryMsg(blockTag, q) |
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dispatch(queryMsg) |
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} |
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} |
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.. more to come |
.. more to come |
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