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With a connection established and stored in a global variable, the cache can be used from anywhere in the service The general pattern followed when implementing Memcached is to first check the cache for the desired value If the value is present, return it; otherwise, compute the result and store it in Memcached so it s available the next time it s needed Here s how this might look in an ActiveRecord class:

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a port rule will service the traf c applicable to the rule If the node with the highest priority is unavailable, the second-highest priority will service; if that s not available, the third highest will service, and so on Using this method, only one node services the traf c, but high availability is achieved automatically as lower-priority nodes for each rule can provide service if required

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To take the design-time-only property even further, it's possible to add items to a component's design-time context menu These items are called verbs , and ShowBorder would make a fine addition to our clock control's verb menu Adding to the verb menu requires that we further augment the custom designer class: public class ClockControlDesigner : ControlDesigner { public override DesignerVerbCollection Verbs { get { // Return new list of context menu items DesignerVerbCollection verbs = new DesignerVerbCollection(); showBorderVerb = new DesignerVerb( GetVerbText(), new EventHandler(ShowBorderClicked)); verbsAdd(showBorderVerb); return verbs; } }

FIGURE 18-11 The node-speci c port rule con gurations To change these values, right-click on the node in the console tree and select Host Properties from the context menu This opens up the nodespeci c information, which allows dedicated IP addresses for the host to be con gured via the Host Parameters tab; additionally, the cluster IP and con guration can be viewed but not changed The last tab shows the Port Rules for the cluster with only the ability to edit the rules enabled; you can t add or remove After you open a rule, everything is unavailable to change except for the handling priority for a single host mode rule or the Load weight for a multiple host mode rule In Figure 18-12, a single host rule is being edited, which allows the handling priority to be modi ed from 1-32 (You can have 32 nodes in a NLB cluster) The priorities that are not currently assigned for the port rule to other nodes in the cluster are available If, for example, you want to make a node number 1 and another node currently has the handling priority of 1, you will rst need to change the priority on the existing number 1 node s port rules (to 3, for example, because the node you want to make 1 is probably number 2); then you can set the handling priority to 1 for the new number 1 node The other type of con guration is load balancing If you select a multiple host rule, you can modify the load weight By default, load weight is set to Equal, so all nodes process the incoming requests evenly However, you can assign a load weight between 0 and 100 to enable speci c nodes to receive more connections than others If you give a node a weight of 0, it receives no portion of the traf c; however, a load of 100 does.

not mean it receives all the traf c To calculate the amount of traf c a particular node receives, take the con gured load weight divided by the sum of all the loads con gured across all nodes So, if in a three-node cluster, each node set the load weight to 100, then each node would receive a third of the traf c, or 100/300 The reason this is not allocated out of 100 is that nodes can be added and removed to the NLB cluster, so having to rede ne the load weights every time would be highly cumbersome and inaccurate You would use higher weighting when you have nodes in the NLB that have differing capabilities, such as a node with more memory and processor power

The worst-case scenario for an NLB cluster is when a node becomes unavailable When this happens, it s detected via the absence of the heartbeat, and the nodes status changed to Unreachable Its icon changes to a white X in a red circle, as shown in Figure 18-13 When the server is restarted, it will automatically be detected as available, and the NLB will

class Employee < ActiveRecord::Base def year_to_date_pay pay = $memcacheget("User:#{id}:ytd_pay") if paynil pay = calculate_year_to_date_pay # Expensive call $memcacheset("User:#{id}:ytd_pay") end pay end private def calculate_year_to_date_pay # end end

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