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for (int i = 0; someMore && i < CITIES_AT_A_TIME; i++) { if (currentCityhasNext()) { final ClientCityData cd = citiesListget(currentCitynext()); currentRow++; getDisplay()setCityData(currentRow, cdcityName, nfformat(cdpopulation), nfformat(cdlatitude), nfformat(cdlongitude)); } else { /* * If there are no more cities, display empty lines * (a fast process) and disable the next timer call */ displayEmptyCities(currentRow, ""); someMore = false; } } /* * If there are still some more cities to display, * schedule a new display process in a short while */ if (someMore) { schedule(CITIES_DELAY_IN_MS); } } } static final int CITIES_AT_A_TIME = 10; static final int CITIES_DELAY_IN_MS = 250;
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Here things start getting back to normal, and the rest of the original Presenter code is pretty much unchanged, except for the getAndDisplayCities() that now uses our TimedCitiesDisplay class
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void getAndDisplayCities() { if (currentStart < 0) { currentStart = 0; } displayEmptyCities(0, "Loading"); getEnvironment()getModel()getCities( getDisplay()getCountryState()getCountry(), getDisplay()getCountryState()getState(), currentStart, CitiesBrowserViewCITIES_PAGE_SIZE, new SimpleCallback<LinkedHashMap<String, ClientCityData>>() { @Override public void goBack( final LinkedHashMap<String, ClientCityData> result) {
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new TimedCitiesDisplay(result)run(); } }); } }
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We can see this solution caught just between runs of our timed process in Figure 1418
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Figure 141 A part of the cities list has already been shown, and a timerbased command will fire shortly, to continue the display
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This is a solution much along the lines of classic JavaScript programming, but GWT actually provides an even better alternative, as we shall see in the next section A Deferred Command-Based Solution Deferred commands are a GWT-specific feature, which make for an even better solution These commands are queued for execution when the CPU is free, so if you do a small
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8 A small confession is in order: I had to set CITIES_DELAY_IN_MS to a far larger value so that I could use my screen capture program and get the shown image
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part of the process, and use a deferred command to resume processing, GWT will run it as soon as possible, for a better throughput (With the timer-based solution, if the user isn t actually doing anything, the time between runs of the display process will simply be wasted) The general pattern of usage for this solution would be as follows
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define a define define define class that attributes attributes attributes extends IncrementalCommand: so it can save its parameters so it can save local variables from run to run so it can save form field values
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on construction: save the received parameters initialize local variables for the process save the current form field values on execute() method: if the current form field values match the saved values: execute some process, updating the local variables if there's still more work to be done return true, so it will run again shortly afterwards otherwise, return false (the job is done) otherwise, return false (situation changed) whenever you want to simulate a thread with a deferred command: create an object of the new class above, with appropriate parameters use the addCommand() to add your new object to the processing queue
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Back to the code, once again we ll leave most of our Presenter unchanged For the
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Timer-based solution, note that now we use IncrementalCommand instead However, if
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you compare both this version and the one in the previous section, you ll find more coincidences than differences
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package comfkerekimvpprojectclientcitiesBrowser4; // imports public class CitiesBrowserPresenter extends Presenter<CitiesBrowserDisplay> { public static String PLACE = "citybrowse"; private class DeferredCitiesDisplay implements IncrementalCommand { final NumberFormat nf = NumberFormatgetDecimalFormat(); LinkedHashMap<String, ClientCityData> citiesList = null; Iterator<String> currentCity = null; int currentRow = 0;
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String originalCountry = null; String originalState = null; int originalStart = 0; public DeferredCitiesDisplay( final LinkedHashMap<String, ClientCityData> pCitiesList) { citiesList = pCitiesList; currentCity = pCitiesListkeySet()iterator(); currentRow = 0; originalCountry = getDisplay()getCountryState()getCountry(); originalState = getDisplay()getCountryState()getState(); originalStart = currentStart; displayEmptyCities(0, "Loading"); }
Now we have an execute() method instead of a run() one, but the actual code is pretty much unchanged Whenever the execute() method is run, if it returns true, it means it has to be run again; if it returns false, the command is considered to be done, and execution will cease
public boolean execute() { boolean someMore = originalCountryequals(getDisplay() getCountryState()getCountry()) && originalStateequals(getDisplay()getCountryState() getState()) // && originalStart == currentStart; for (int i = 0; someMore && i < CITIES_AT_A_TIME; i++) { if (currentCityhasNext()) { final ClientCityData cd = citiesListget(currentCitynext()); currentRow++; getDisplay()setCityData(currentRow, cdcityName, nfformat(cdpopulation), nfformat(cdlatitude), nfformat(cdlongitude)); } else { displayEmptyCities(currentRow, ""); someMore = false; } } return someMore; } }