Examples of org.apache.commons.configuration2.reloading.CombinedReloadingController

Package org.apache.commons.configuration2.reloading

Examples of org.apache.commons.configuration2.reloading.CombinedReloadingController

org.apache.commons.configuration2.sync.Synchronizer

A specialized {@code ReloadingController} implementation which manages anarbitrary number of other {@code ReloadingController} objects.

This class can be used to handle multiple simple controllers for reload operations as a single object. As a usage example consider a combined configuration containing a number of configuration sources of which some support reloading. In this scenario all {@code ReloadingController} instancesfor the reloading-enabled sources can be added to a {@code CombinedReloadingController}. Then by triggering the combined controller a reload check is performed on all child sources.

This class is a typical implementation of the composite pattern. An instance is constructed with a collection of sub {@code ReloadingController}objects. Its operations are implemented by delegating to all child controllers.

This class expects the managed controller objects to be passed to the constructor. From this list a defensive copy is created so that it cannot be changed later on. Derived classes can override the {@link #getSubControllers()} method if they need another way to handle childcontrollers (e.g. a more dynamic way). However, they are then responsible to ensure a safe access to this list in a multi-threaded environment.
@version $Id: CombinedReloadingController.java 1624601 2014-09-12 18:04:36Z oheger $ @since 2.0

            InterruptedException
    {
        // populate the test combined configuration
        setUpSourceTest();
        XMLConfiguration xmlConf = new XMLConfiguration();
        new FileHandler(xmlConf).load(ConfigurationAssert
                .getTestFile("test.xml"));
        config.addConfiguration(xmlConf);
        PropertiesConfiguration propConf = new PropertiesConfiguration();
        new FileHandler(propConf).load(ConfigurationAssert
                .getTestFile("test.properties"));
        for (int i = 0; i < 8; i++)
        {
            config.addConfiguration(new BaseHierarchicalConfiguration());
        }

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     * @return the URL of the include file or <b>null</b> if it cannot be
     *         resolved
     */
    private URL locateIncludeFile(String basePath, String fileName)
    {
        FileLocator includeLocator =
                FileLocatorUtils.fileLocator(locator).sourceURL(null)
                        .basePath(basePath).fileName(fileName).create();
        return FileLocatorUtils.locate(includeLocator);
    }

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        for (ConfigurationBuilder<? extends Configuration> b : getChildBuilders())
        {
            obtainReloadingController(subControllers, b);
        }


        CombinedReloadingController ctrl =
                new CombinedReloadingController(subControllers);
        ctrl.resetInitialReloadingState();
        return ctrl;
    }

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     * @return the newly created {@code ReloadingController}
     */
    private ReloadingController createReloadingController()
    {
        Set<ReloadingController> empty = Collections.emptySet();
        return new CombinedReloadingController(empty)
        {
            @Override
            public Collection<ReloadingController> getSubControllers()
            {
                Collection<FileBasedConfigurationBuilder<T>> builders =

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                        new FileBasedConfigurationBuilder<XMLConfiguration>(
                                XMLConfiguration.class))
                .setDefinitionBuilderParameters(
                        new FileBasedBuilderParametersImpl().setFile(testFile)));
        builder.getConfiguration();
        CombinedReloadingController rc =
                (CombinedReloadingController) builder.getReloadingController();
        assertTrue("Got sub reloading controllers", rc.getSubControllers()
                .isEmpty());
    }

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        ReloadingCombinedConfigurationBuilder confBuilder =
                builder.configure(new FileBasedBuilderParametersImpl()
                        .setFile(testFile));
        assertSame("Wrong configured builder instance", builder, confBuilder);
        builder.getConfiguration();
        CombinedReloadingController rc =
                (CombinedReloadingController) builder.getReloadingController();
        Collection<ReloadingController> subControllers = rc.getSubControllers();
        assertEquals("Wrong number of sub controllers", 1,
                subControllers.size());
        ReloadingController subctrl =
                ((ReloadingControllerSupport) builder.getDefinitionBuilder())
                        .getReloadingController();

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        File testFile =
                ConfigurationAssert.getTestFile("testCCReloadingNested.xml");
        builder.configure(new FileBasedBuilderParametersImpl()
                .setFile(testFile));
        builder.getConfiguration();
        CombinedReloadingController rc =
                (CombinedReloadingController) builder.getReloadingController();
        Collection<ReloadingController> subControllers = rc.getSubControllers();
        assertEquals("Wrong number of sub controllers", 2,
                subControllers.size());
        ReloadingControllerSupport ccBuilder =
                (ReloadingControllerSupport) builder.getNamedBuilder("cc");
        assertTrue("Sub controller not found",
                subControllers.contains(ccBuilder.getReloadingController()));
        CombinedReloadingController rc2 =
                (CombinedReloadingController) ccBuilder
                        .getReloadingController();
        assertEquals("Wrong number of sub controllers (2)", 3, rc2
                .getSubControllers().size());
    }

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            config.addConfiguration(new BaseHierarchicalConfiguration());
        }
        config.getConfiguration(0).addProperty(KEY_CONCURRENT, TEST_NAME);


        // Set a single synchronizer for all involved configurations
        Synchronizer sync = new ReadWriteSynchronizer();
        config.setSynchronizer(sync);
        for (Configuration c : config.getConfigurations())
        {
            c.setSynchronizer(sync);
        }

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     * @since 2.0
     */
    @Override
    public final Synchronizer getSynchronizer()
    {
        Synchronizer sync = synchronizer;
        return (sync != null) ? sync : NoOpSynchronizer.INSTANCE;
    }

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            config.addConfiguration(new BaseHierarchicalConfiguration());
        }
        config.getConfiguration(0).addProperty(KEY_CONCURRENT, TEST_NAME);


        // Set a single synchronizer for all involved configurations
        Synchronizer sync = new ReadWriteSynchronizer();
        config.setSynchronizer(sync);
        for (Configuration c : config.getConfigurations())
        {
            c.setSynchronizer(sync);
        }

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