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搞懂Java例外處理的難題:Checked與Unchecked Exceptions不再是問題
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討論Java語言中checked與unchecked exceptions使用上的問題
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搞懂Java例外處理的難題:Checked與Unchecked Exceptions不再是問題
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Teddy Chen teddy@teddysoft.tw
Feb. 21 2013
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Copyright@2013 Teddysoft
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系統不穩定
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Problem
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Problem
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Copyright@2013 Teddysoft
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• Correctness
– Contract Specification(超出範圍) • Robustness – Exception Handling Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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Checked Exception
Throwable Unchecked Exception Exception Error RuntimeException Copyright@2013 Teddysoft
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declare handle
Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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• Checked exceptions
for recoverable conditions – 打死不知道要如何去recover 任何東東? class FileService { … backup () { FileService fs = new public copy (String s) FileService(); throws IOException { try { … fs.copy(“a.txt”); if (error) } throw new catch (IOException e){ IOException(“reason”); // exception handling code } } } } Copyright@2013 Teddysoft
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1 2 3
Copyright@2013 Teddysoft
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1
2 3 Copyright@2013 Teddysoft
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• 我就是不喜歡checked exception,咬我啊! •
例如,Standard Widget Toolkit (SWT, Eclipse的UI元件)只使用unchecked exception: – SWTException用來表示可修復的SWT錯誤。 – SWTError則用來表示不可修復的錯誤。 Copyright@2013 Teddysoft
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Your application Spring
DataAccessException unchecked Framework checked Java SQLException HibernateException technology- technology- specific specific Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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•
Exception Type • Recoverability • Application Context • Robustness Level – G1: Error-reporting (錯誤回報) – G2: State-recovery (狀態回復) – G3: Behavior-recovery (行為回復) • Exception Handling Policy Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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練習1: 如果Accepter收到一
Message Presentation Layer E'' 5. report 個 IOException,鄉民們第 一個反應是什麼? AppWin Application E' 4. wrap Layer GameServer Service Layer 3. recover E 2. rethrow 練習2: 如果Accepter收到 Acceptor 一個 RuntimeException, 鄉民們第一個反應是什麼? JVM E 1. throw Copyright@2013 Teddysoft
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Message
練習3: 如果Accepter收到一 Presentation E'' 5. report 個 IOException,鄉民們該 Layer AppWin 如何處置? Application E' 4. wrap Layer GameServer 3. recover Service Layer E 2. rethrow 練習4: 如果Accepter收到 Acceptor 一個 RuntimeException, JVM E 1. throw 鄉民們該如何處置? Copyright@2013 Teddysoft
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Message
練習5: 如果Accepter收到一 Presentation E'' 5. report 個 IOException,鄉民們該 Layer AppWin 如何處置? Application E' 4. wrap Layer GameServer 3. recover 練習6: 如果GameServer收 Service Layer E 2. rethrow Acceptor 到 IOException ,鄉民們該 如何處置? JVM E 1. throw Copyright@2013 Teddysoft
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Message Presentation Layer
E'' 5. report 練習7: Accepter的RL要 AppWin E' 4. wrap 設為多少? Application Layer GameServer 3. recover Service Layer E 2. rethrow 練習8: GameServer的RL Acceptor 要設為多少? JVM E 1. throw Copyright@2013 Teddysoft
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Message Presentation Layer
E'' 5. report 練習9: Acceptor這一層 AppWin 有哪些policy可用? Application E' 4. wrap Layer GameServer 3. recover Service Layer E 2. rethrow Acceptor 練習10: GameServer這 JVM 一層有哪些policy可用? E 1. throw Copyright@2013 Teddysoft
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Copyright@2013 Teddysoft
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