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233 "At most once" semantics Depending largely on the underlying communications, remote procedure call mechanisms like RMI generally implement either "at least once" or "at most once" semantics An "at least once" system guarantees that the remote procedure has executed at least once, possibly more than once An "at most once" system guarantees that the remote procedure has executed at most once, possibly never RMI implements "at most once" semantics A remote method which returns normally is guaranteed to have executed exactly once; a remote method which throws a remote exception may or may not have executed at all A remote method which returns normally does not need to be retried, and cannot be retried while preserving "at most once" semantics Whether a remote method which throws an exception may be retried while preserving "at most once" semantics depends on the exception For application defined exceptions, this is a matter for the application designer For remote exceptions, the matter is more complex After a remote exception, RMI clients cannot always determine whether the remote method has executed or not For example, an UnmarshalException may be thrown either while the server is receiving the arguments or while the client is receiving the result of the completed method An RMI client cannot necessarily distinguish these two situations, and therefore cannot know whether or not to retry the call In this circumstance, often the only sensible thing to do is to retry the call and have the server deal with duplicate transmissions as best it may It is sometimes stated that remote methods which may be retried deliberately, accidentally, or unavoidably due to the operation of one or more lower level software or protocol layers must be idempotent This term means that the call may be repeated without affecting the overall result of the computation The property of idempotence is very important in transactional systems Consider the example of transmitting a transaction which credits an amount to a bank account Such a transaction is not idempotent: every time you apply it, the bank balance increases However, if we can somehow arrange to discard transactions which have already been applied, eg by using unique sequence numbers, the transaction would be idempotent: it could be transmitted as often as you like without crediting the account more than once All this has two implications for the design and implementation of remote calls and callers: (1) if you can, design all your remote methods to be idempotent, or (2) don't retry a remote method unless you are assured it hasn't already been executed (or (3) both).

not set the length to zero The array size is fixed and cannot be modified Therefore, the Clear() method sets each element in the array to its default value (false, 0, or null) This explains why ConsoleWriteLine() creates a blank line when writing out the array after Clear() is called

column1setEditingSupport(new EditingSupport(treeViewer) { protected CellEditor getCellEditor(Object element) { if (editor == null) { Composite tree = (Composite) treeViewergetControl(); editor = new TextCellEditor(tree); editoraddListener(new ICellEditorListener() { public void applyEditorValue() { setErrorMessage(null); } public void cancelEditor() { setErrorMessage(null); } public void editorValueChanged( boolean oldValidState, boolean newValidState) { setErrorMessage(editorgetErrorMessage()); } private void setErrorMessage(String errorMessage) { getEditorSite()getActionBars() getStatusLineManager() setErrorMessage(errorMessage); } });

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Visual Basic includes a Redim statement for changing the number of items in an array Although there is no equivalent C# specific keyword, there is a method available in NET 20 that will re-create the array and then copy all the elements over to the new array The method is called System

Before editing is added in the tree, a user could easily select one or more rows, but now the cell editor is always open One possible solution is to only open the editor when the Alt key is held down, but select one or more rows when it is not To accomplish this, extract the ColumnViewerEditorActivationListener from the Favorites view (see end of Section 739, Inline

Like strings, arrays have instance members that are accessed not from the data type, but directly from the variable Length is an example of an instance member because access to Length is through the array variable, not the class Other significant instance members are GetLength(), Rank, and Clone() Retrieving the length of a particular dimension does not require the Length property To retrieve the size of a particular rank, an array includes a GetLength() instance method When calling this method, it is necessary to specify the rank whose length will be returned (see Listing 251)

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