Brian Goetz Quotes
ThreadLocal, Which Allows You To Associate A Per-thread Value With A Value-holding Object. Thread-Local Provides Get And Set Accessormethods That Maintain A Separate Copy Of The Value For Each Thread That Uses It, So A Get Returns The Most Recent Value Passed To Set From The Currently Executing Thread. Thread-local Variables Are Often Used To Prevent Sharing In Designs Based On Mutable Singletons Or Global Variables. For Example, A Single-threaded Application Might Maintain A Global Database Connection That Is Initialized At Startup To Avoid Having To Pass A Connection To Every Method. Since JDBC Connections May Not Be Thread-safe, A Multithreaded Application That Uses A Global Connection Without Additional Coordination Is Not Thread-safe Either. By Using A ThreadLocal To Store The JDBC Connection, As In ConnectionHolder In Listing 3.10, Each Thread Will Have Its Own Connection. Listing
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