Example usage for org.apache.commons.configuration2.event EventListener EventListener

Introduction

In this page you can find the example usage for org.apache.commons.configuration2.event EventListener EventListener.

Prototype

EventListener

Source Link

Usage

From source file:org.apache.nifi.lookup.configuration2.CommonsConfigurationLookupService.java

@OnEnabled
public void onEnabled(final ConfigurationContext context) throws InitializationException {
    final String config = context.getProperty(CONFIGURATION_FILE).getValue();
    final FileBasedBuilderParameters params = new Parameters().fileBased().setFile(new File(config));
    this.builder = new ReloadingFileBasedConfigurationBuilder<>(resultClass).configure(params);
    builder.addEventListener(ConfigurationBuilderEvent.CONFIGURATION_REQUEST,
            new EventListener<ConfigurationBuilderEvent>() {
                @Override//from   w w w. j ava2 s  .c  o  m
                public void onEvent(ConfigurationBuilderEvent event) {
                    if (builder.getReloadingController().checkForReloading(null)) {
                        getLogger().debug("Reloading " + config);
                    }
                }
            });

    try {
        // Try getting configuration to see if there is any issue, for example wrong file format.
        // Then throw InitializationException to keep this service in 'Enabling' state.
        builder.getConfiguration();
    } catch (ConfigurationException e) {
        throw new InitializationException(e);
    }
}

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