LANs, and broker, 209, 220
latency, 229
layer facade, 154 155
layer supertype, 154
layered applications, 152 160
benefits and liabilities, 159 160
as constraint on pattern frames, 24 25
described, 149 150
for distributed systems, 194
general introduction, 149 150
general principles, 153
proxies, 194
testing considerations, 158 159
vs.tiered distribution, 184
layering scheme
creating your own, 157 158
reusing an existing, 158
layers
adding, 12
mechanisms inside, 7
overview, 4 13
quote application, 5
quote business, 5
quote data access, 5
quote presentation, 5
scheme diagram, 153
vs. tiers, 148 149, 168 169
See also three-layered services
layers pattern, 6
lazy instantiation, 262
LDAP, 178 179
Least Frequently Used, 113 114
least-connection algorithms, 321
LFU, 113 114
licensing considerations, 167
lightweight directory access protocol See LDAP
ListController base class, 53
load balancers, 320
load balancing
and asynchronous session state management, 325
and centralized state management, 324
components, 322
described, 204
implementation categories, 326
Load event, 61 64
load-balanced clusters, 27, 318, 320 329
benefits and liabilities, 329
described, 312 313
related patterns, 329
See also clusters
load-balanced tier, 327 328
load-based algorithms, 321
LoadMacroHeader method, 77
LoadMicroHeader method, 77
local area network See LAN
local copy, 195
lock block, 262
long type, 281
look and feel, 61 66
loose coupling, 129
low couplings, 159