public Provider createProvider()

in qpid-jms-discovery/src/main/java/org/apache/qpid/jms/provider/discovery/DiscoveryProviderFactory.java [57:120]
45 lines of code
5 McCabe index (conditional complexity)

    public Provider createProvider(URI remoteURI, ProviderFutureFactory futureFactory) throws Exception {

        CompositeData composite = URISupport.parseComposite(remoteURI);
        Map<String, String> options = composite.getParameters();

        // Gather failover and discovery options.
        Map<String, String> failoverOptions = PropertyUtil.filterProperties(options, FailoverProviderFactory.FAILOVER_OPTION_PREFIX);
        Map<String, String> failoverNestedOptions = PropertyUtil.filterProperties(failoverOptions, FailoverProviderFactory.FAILOVER_NESTED_OPTION_PREFIX_ADDON);

        Map<String, String> discoveryOptions = PropertyUtil.filterProperties(options, DISCOVERY_OPTION_PREFIX);
        Map<String, String> discoveredOptions = PropertyUtil.filterProperties(discoveryOptions, DISCOVERY_DISCOVERED_OPTION_PREFIX_ADON);

        // Combine the provider options, and the nested/discovered options.
        Map<String, String> mainOptions = new HashMap<String, String>();
        mainOptions.putAll(failoverOptions);
        mainOptions.putAll(discoveryOptions);

        Map<String, String> nestedOptions = new HashMap<String, String>();
        nestedOptions.putAll(failoverNestedOptions);
        nestedOptions.putAll(discoveredOptions);

        Map<String, String> providerOptions = PropertyUtil.filterProperties(options, "provider.");
        // If we have been given a futures factory to use then we ignore any URI options indicating
        // what to create and just go with what we are given.
        if (futureFactory == null) {
            // Create a configured ProviderFutureFactory for use by the resulting AmqpProvider
            futureFactory = ProviderFutureFactory.create(providerOptions);
            if (!providerOptions.isEmpty()) {
                String msg = ""
                    + " Not all Provider options could be applied during Failover Provider creation."
                    + " Check the options are spelled correctly."
                    + " Unused parameters=[" + providerOptions + "]."
                    + " This provider instance cannot be started.";
                throw new IllegalArgumentException(msg);
            }
        }

        // Failover will apply the nested options to each URI while attempting to connect.
        FailoverProvider failover = new FailoverProvider(Collections.emptyList(), nestedOptions, futureFactory);
        Map<String, String> leftOverDiscoveryOptions = PropertyUtil.setProperties(failover, mainOptions);

        DiscoveryProvider discovery = new DiscoveryProvider(remoteURI, failover);
        Map<String, String> unusedOptions = PropertyUtil.setProperties(discovery, leftOverDiscoveryOptions);

        if (!unusedOptions.isEmpty()) {
            String msg = ""
                + " Not all options could be set on the Discovery provider."
                + " Check the options are spelled correctly."
                + " Unused parameters=[" + unusedOptions + "]."
                + " This Provider cannot be started.";
            throw new IllegalArgumentException(msg);
        }

        List<URI> agentURIs = composite.getComponents();
        List<DiscoveryAgent> discoveryAgents = new ArrayList<DiscoveryAgent>(agentURIs.size());

        for (URI agentURI : agentURIs) {
            discoveryAgents.add(DiscoveryAgentFactory.createAgent(agentURI));
        }

        discovery.setDiscoveryAgents(discoveryAgents);

        return discovery;
    }