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stands to reason that these code splits will help4 A part of the menu code (see 4) used to read:
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} else if (tokenequals(CitiesBrowserPresenterPLACE)) { paneladd(new CitiesBrowserPresenter(args, new CitiesBrowserView(), this)getDisplay()asWidget()); }
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We could split off the Cities Browsing code, by rewriting the else as
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} else if (tokenequals(CitiesBrowserPresenterPLACE)) { final Panel myPanel = panel; final String myArgs = args; GWTrunAsync(new RunAsyncCallback() { @Override public void onFailure(final Throwable reason) { Environmentthis showAlert("Couldn't run the Cities Browser code!"); } public void onSuccess() { myPaneladd(new CitiesBrowserPresenter(myArgs, new CitiesBrowserView(), Environmentthis)getDisplay() asWidget()); } }); }
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We had to add some final attributes to get at the panel and args variables, but other than that, the transition is simple; we also had to change the this reference to Environmentthis because of closure problems We could even do some refactoring to simplify splitting off more parts of the code First, we could extend the RunAsyncCallback() interface by writing:5
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abstract class MyRunAsyncCallback implements RunAsyncCallback {
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Let s have a few attributes to store the arguments that are required for the code We ll pass the said arguments to our new constructor
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4 And, if you feel it will be quite likely that a certain piece of code will get used, but didn t want to load it right at the beginning because of download time reasons, you could apply a variation of the prefetching pattern we used earlier in the book: Do a GWTrunAsync() call with an empty onSuccess() method, and thus use background time to get the code loaded in advance of its being required 5 Yes, and I admit the MyRunAsyncCallback name is kind of lame
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String myOwnArgs; Panel myOwnPanel; Environment myOwnEnvironment; String myOwnErrorMessage; public MyRunAsyncCallback( final String args, final Panel panel, final Environment environment, final String errorMessage) { myOwnArgs = args; myOwnPanel = panel; myOwnEnvironment = environment; myOwnErrorMessage = errorMessage; }
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The onFailure() method is now trivial
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Using this code requires writing the onSuccess() method For example, we might split off the Cities Creator form, by means of
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} else if (tokenequals(CityCreatorPresenterPLACE)) { GWTrunAsync(new MyRunAsyncCallback(args, panel, this, "Couldn't load the cities browser code") { @Override public void onSuccess() { myOwnPaneladd(new CityCreatorPresenter(myOwnArgs, new CityCreatorView(), myOwnEnvironment) getDisplay()asWidget()); } }); }
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If you compile both versions of the code (with and without the code split) you will notice that some files get smaller, but several more files are produced In these examples, because the Cities Browsing and Creation classes aren t used elsewhere, all their code will be removed from the initial download, reducing its size But how can you know for sure Let s analyze an important tool, the Compile Reports, which for a short while were known as Story Of Your Compile, or SOYC and this will also help understand the compile process
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Turning on the Compile Reports option will produce a directory with a set of HTML files, which comprise the required report These reports will give you a graphical representation of the results of the compile process and provide you information to find possible code reduction hints to analyze code splitting problems and to let you work out further code optimizations6 The Compile Report is a group of static HTML pages and can be found at the extras directory (in my case, at my home directory, at workspace/mvpproject/extras) in the mvpproject/soycReport directory; you can examine it by opening the indexhtml file that is situated there (See Figure 152) In our case, because we were creating code
Figure 152 The basic compile report shows all permutations that were
generated by the compilation process The permutation numbers match those shown in Figure 151 but might vary
6 Official usage notes on Compile Reports can be found at http://codegooglecom/webtoolkit/ doc/latest/DevGuideCompileReporthtml
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for four locales (the default one, plus the three ones we defined in 12), and GWT always produces code for six browser types, we should get 24 permutations, numbered 0 to 23 If we click on a specific permutation, we can see its size details (See Figure 153)