Class: Quark::MdkDiscovery::Cluster

Inherits:
DatawireQuarkCore::QuarkObject show all
Extended by:
DatawireQuarkCore::Static
Defined in:
lib/mdk_discovery.rb

Overview

a single service. Each service provider is represented by a Node.

Constant Summary

Constants included from DatawireQuarkCore::Static

DatawireQuarkCore::Static::Unassigned

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from DatawireQuarkCore::Static

_lazy_statics, static, unlazy_statics

Methods inherited from DatawireQuarkCore::QuarkObject

#to_s

Constructor Details

#initialize(fpfactory) ⇒ Cluster

Returns a new instance of Cluster.



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# File 'lib/mdk_discovery.rb', line 1144

def initialize(fpfactory)
    
    self.__init_fields__
    (self)._fpfactory = fpfactory

    nil
end

Instance Attribute Details

#_counter ⇒ Object

Returns the value of attribute _counter.



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# File 'lib/mdk_discovery.rb', line 1135

def _counter
  @_counter
end

#_failurepolicies ⇒ Object

Returns the value of attribute _failurepolicies.



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# File 'lib/mdk_discovery.rb', line 1135

def _failurepolicies
  @_failurepolicies
end

#_fpfactory ⇒ Object

Returns the value of attribute _fpfactory.



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# File 'lib/mdk_discovery.rb', line 1135

def _fpfactory
  @_fpfactory
end

#_registeredVersions ⇒ Object

Returns the value of attribute _registeredVersions.



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# File 'lib/mdk_discovery.rb', line 1135

def _registeredVersions
  @_registeredVersions
end

#_waiting ⇒ Object

Returns the value of attribute _waiting.



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# File 'lib/mdk_discovery.rb', line 1135

def _waiting
  @_waiting
end

#nodes ⇒ Object

Returns the value of attribute nodes.



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# File 'lib/mdk_discovery.rb', line 1135

def nodes
  @nodes
end

Instance Method Details

#__init_fields__ ⇒ Object 



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# File 'lib/mdk_discovery.rb', line 1404

def __init_fields__()
    
    self.nodes = ::DatawireQuarkCore::List.new([])
    self._waiting = ::DatawireQuarkCore::List.new([])
    self._failurepolicies = {}
    self._counter = 0
    self._fpfactory = nil
    self._registeredVersions = ::DatawireQuarkCore::List.new([])

    nil
end

#_addRequest(version, factory) ⇒ Object 



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# File 'lib/mdk_discovery.rb', line 1288

def _addRequest(version, factory)
    
    (@_waiting) << (::Quark.mdk_discovery._Request.new(version, factory))

    nil
end

#_copyNode(node) ⇒ Object

Create a Node for external use.



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# File 'lib/mdk_discovery.rb', line 1169

def _copyNode(node)
    
    result = ::Quark.mdk_discovery.Node.new()
    (result).id = (node).id
    (result).address = (node).address
    (result).version = (node).version
    (result).service = (node).service
    (result).properties = (node).properties
    (result)._policy = self.failurePolicy(node)
    return result

    nil
end

#_getClass ⇒ Object 



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# File 'lib/mdk_discovery.rb', line 1348

def _getClass()
    
    return "mdk_discovery.Cluster"

    nil
end

#_getField(name) ⇒ Object 



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# File 'lib/mdk_discovery.rb', line 1355

def _getField(name)
    
    if ((name) == ("nodes"))
        return (self).nodes
    end
    if ((name) == ("_waiting"))
        return (self)._waiting
    end
    if ((name) == ("_failurepolicies"))
        return (self)._failurepolicies
    end
    if ((name) == ("_counter"))
        return (self)._counter
    end
    if ((name) == ("_fpfactory"))
        return (self)._fpfactory
    end
    if ((name) == ("_registeredVersions"))
        return (self)._registeredVersions
    end
    return nil

    nil
end

#_setField(name, value) ⇒ Object 



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# File 'lib/mdk_discovery.rb', line 1380

def _setField(name, value)
    
    if ((name) == ("nodes"))
        (self).nodes = ::DatawireQuarkCore.cast(value) { ::DatawireQuarkCore::List }
    end
    if ((name) == ("_waiting"))
        (self)._waiting = ::DatawireQuarkCore.cast(value) { ::DatawireQuarkCore::List }
    end
    if ((name) == ("_failurepolicies"))
        (self)._failurepolicies = ::DatawireQuarkCore.cast(value) { ::Hash }
    end
    if ((name) == ("_counter"))
        (self)._counter = ::DatawireQuarkCore.cast(value) { ::Integer }
    end
    if ((name) == ("_fpfactory"))
        (self)._fpfactory = ::DatawireQuarkCore.cast(value) { ::Quark.mdk_discovery.FailurePolicyFactory }
    end
    if ((name) == ("_registeredVersions"))
        (self)._registeredVersions = ::DatawireQuarkCore.cast(value) { ::DatawireQuarkCore::List }
    end

    nil
end

#add(node) ⇒ Object

Add a Node to the cluster (or, if it’s already present in the cluster, update its properties). At present, this involves a linear search, so very large Clusters are unlikely to perform well.



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# File 'lib/mdk_discovery.rb', line 1242

def add(node)
    
    kdx = 0
    foundVersion = false
    while ((kdx) < ((@_registeredVersions).size)) do
        if (((@_registeredVersions)[kdx]) == ((node).version))
            foundVersion = true
            break
        end
        kdx = (kdx) + (1)
    end
    if (!(foundVersion))
        (@_registeredVersions) << ((node).version)
    end
    if (!((@_failurepolicies).key?((node).address)))
        (@_failurepolicies)[(node).address] = ((self)._fpfactory.create())
    end
    if ((((self)._waiting).size) > (0))
        waiting = (self)._waiting
        (self)._waiting = ::DatawireQuarkCore::List.new([])
        jdx = 0
        while ((jdx) < ((waiting).size)) do
            req = (waiting)[jdx]
            if (::Quark.mdk_util.versionMatch((req).version, (node).version))
                if (!(((req).factory).promise.value().hasValue()))
                    (req).factory.resolve(self._copyNode(node))
                end
            else
                ((self)._waiting) << (req)
            end
            jdx = (jdx) + (1)
        end
    end
    idx = 0
    while ((idx) < ((@nodes).size)) do
        if (((((@nodes)[idx]).address) == ((node).address)) || (((@nodes)[idx].getId()) == ((node).id)))
            (@nodes)[idx] = (node)
            return
        end
        idx = (idx) + (1)
    end
    (@nodes) << (node)

    nil
end

#choose ⇒ Object

Choose a single Node to talk to. At present this is a simple round robin.



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# File 'lib/mdk_discovery.rb', line 1159

def choose()
    
    return self.chooseVersion(nil)

    nil
end

#chooseVersion(version) ⇒ Object

Choose a compatible version of a service to talk to.



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# File 'lib/mdk_discovery.rb', line 1196

def chooseVersion(version)
    
    if (((@nodes).size) == (0))
        return ::DatawireQuarkCore.cast(nil) { ::Quark.mdk_discovery.Node }
    end
    start = (@_counter) % ((@nodes).size)
    @_counter = (@_counter) + (1)
    count = 0
    while ((count) < ((@nodes).size)) do
        choice = ((start) + (count)) % ((@nodes).size)
        candidate = (@nodes)[choice]
        policy = ((self)._failurepolicies)[(candidate).address]
        if ((::Quark.mdk_util.versionMatch(version, (candidate).version)) && (policy.available()))
            return self._copyNode(candidate)
        end
        count = (count) + (1)
    end
    return ::DatawireQuarkCore.cast(nil) { ::Quark.mdk_discovery.Node }

    nil
end

#failurePolicy(node) ⇒ Object

Get the FailurePolicy for a Node.



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# File 'lib/mdk_discovery.rb', line 1186

def failurePolicy(node)
    
    return ((self)._failurepolicies)[(node).address]

    nil
end

#isEmpty ⇒ Object

Returns true if and only if this Cluster contains no Nodes.



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# File 'lib/mdk_discovery.rb', line 1318

def isEmpty()
    
    return ((@nodes).size) <= (0)

    nil
end

#matchingVersionRegistered(version) ⇒ Object

Return whether node with semantically matching version was registered at some point.



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# File 'lib/mdk_discovery.rb', line 1223

def matchingVersionRegistered(version)
    
    idx = 0
    while ((idx) < ((@_registeredVersions).size)) do
        if (::Quark.mdk_util.versionMatch(version, (@_registeredVersions)[idx]))
            return true
        end
        idx = (idx) + (1)
    end
    return false

    nil
end

#remove(node) ⇒ Object

Remove a Node from the cluster, if it’s present. If it’s not present, do nothing. Note that it is possible to remove all the Nodes and be left with an empty cluster.



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# File 'lib/mdk_discovery.rb', line 1300

def remove(node)
    
    idx = 0
    while ((idx) < ((@nodes).size)) do
        ep = (@nodes)[idx]
        if ((ep.getId()) == (node.getId()))
            (@nodes).delete_at(idx)
            return
        end
        idx = (idx) + (1)
    end

    nil
end

#toString ⇒ Object

Return a string representation of the Cluster.

WARNING: every Node is represented in the string. Large Clusters will produce unusably large strings.



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# File 'lib/mdk_discovery.rb', line 1331

def toString()
    
    result = "Cluster("
    idx = 0
    while ((idx) < ((@nodes).size)) do
        if ((idx) > (0))
            result = (result) + (", ")
        end
        result = (result) + ((@nodes)[idx].toString())
        idx = (idx) + (1)
    end
    result = (result) + (")")
    return result

    nil
end