Examples of org.apache.avalon.framework.component.ComponentManager

Package org.apache.avalon.framework.component

Examples of org.apache.avalon.framework.component.ComponentManager

org.apache.avalon.framework.component.ComponentManager
A ComponentManager selects Components based on a role. The contract is that all the Components implement the differing roles and there is one Component per role. If you need to select on of many Components that implement the same role, then you need to use a ComponentSelector. Roles are usually the full interface name.
A role is better understood by the analogy of a play. There are many different roles in a script. Any actor or actress can play any given part and you get the same results (phrases said, movements made, etc.). The exact nuances of the performance is different.

Below is a list of things that might be considered the different roles:
- InputAdapter and OutputAdapter
- Store and Spool
The ComponentManager does not specify the methodology of getting the Component, merely the interface used to get it. Therefore the ComponentManager can be implemented with a factory pattern, an object pool, or a simple Hashtable.

Deprecated: Use {@link org.apache.avalon.framework.service.ServiceManager} instead.
@see org.apache.avalon.framework.component.Component @see org.apache.avalon.framework.component.Composable @see org.apache.avalon.framework.component.ComponentSelector @author Avalon Development Team @version CVS $Revision: 1.21 $ $Date: 2004/02/11 14:34:24 $

        }


        Connection conn = null;


        try {
            ComponentManager componentManager = (ComponentManager)getMailetContext().getAttribute(Constants.AVALON_COMPONENT_MANAGER);
            // Get the DataSourceSelector service
            DataSourceSelector datasources = (DataSourceSelector)componentManager.lookup(DataSourceSelector.ROLE);
            // Get the data-source required.
            datasource = (DataSourceComponent)datasources.select(datasourceName);


            conn = datasource.getConnection();

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    /**
     * Initialize the mailet
     */
    public void init() {
        ComponentManager compMgr = (ComponentManager)getMailetContext().getAttribute(Constants.AVALON_COMPONENT_MANAGER);
        try {
            UsersStore usersStore = (UsersStore) compMgr.lookup("org.apache.james.services.UsersStore");
            String repName = getInitParameter("repositoryName");


            members = (UsersRepository) usersStore.getRepository(repName);
        } catch (ComponentException cnfe) {
            log("Failed to retrieve Store component:" + cnfe.getMessage());

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            passThrough = new Boolean(getInitParameter("passThrough")).booleanValue();
        } catch (Exception e) {
            // Ignore exception, default to false
        }


        ComponentManager compMgr = (ComponentManager)getMailetContext().getAttribute(Constants.AVALON_COMPONENT_MANAGER);
        try {
            MailStore mailstore = (MailStore) compMgr.lookup("org.apache.james.services.MailStore");
            DefaultConfiguration mailConf
                = new DefaultConfiguration("repository", "generated:ToRepository");
            mailConf.setAttribute("destinationURL", repositoryPath);
            mailConf.setAttribute("type", "MAIL");
            repository = (MailRepository) mailstore.select(mailConf);

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     * If none is specified, the method returns <code>null</code>.
     *
     * @return the parent component manager, or <code>null</code>.
     */
    private synchronized ComponentManager getParentComponentManager() {
        ComponentManager parentComponentManager = null;
        if (parentComponentManagerClass != null) {
            try {
                String initParam = null;
                int dividerPos = parentComponentManagerClass.indexOf('/');
                if (dividerPos != -1) {

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        if (config == null) {
            getLogger().debug("Sitemap has no components definition at " + tree.getLocation());
            config = new DefaultConfiguration("", "");
        }


        ComponentManager manager = new CocoonComponentManager(this.parentManager);


        LifecycleHelper.setupComponent(manager,
            getLogger(),
            this.context,
            this.parentManager,
            this.roleManager,
            this.logKit,
            config
        );


        // Set parent of all selectors.
        if (this.parentManager != null) {


            for (int i = 0; i < ComponentsSelector.SELECTOR_ROLES.length; i++) {


                String role = ComponentsSelector.SELECTOR_ROLES[i];


                ComponentSelector parentSelector = null;
                try {
                    parentSelector = (ComponentSelector)this.parentManager.lookup(role);
                } catch(Exception e) {
                    // ignore and keep it null
                }


                if (parentSelector != null) {


                    ExtendedComponentSelector localSelector = null;
                    try {
                        localSelector = (ExtendedComponentSelector)manager.lookup(role);


                        if (localSelector != parentSelector) {
                            // local selector wasn't given by chaining to the parent manager
                            localSelector.setParentSelector(parentSelector);
                        }
                        manager.release(localSelector);


                    } catch(Exception e) {
                        // ignore
                    }

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            }
            Cocoon c = (Cocoon) ClassUtils.newInstance("org.apache.cocoon.Cocoon");
            ContainerUtil.enableLogging(c, getCocoonLogger());
            c.setLoggerManager(getLoggerManager());
            ContainerUtil.contextualize(c, this.appContext);
            final ComponentManager parent = this.getParentComponentManager();
            if (parent != null) {
                ContainerUtil.compose(c, parent);
            }
            if (this.enableInstrumentation) {
                c.setInstrumentManager(getInstrumentManager());

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        if ( connection == null ) {
            throw new RuntimeException("Connection configuration is missing for " + this.getClass().getName() + "." +
                    " Have a look at the iBatis sqlMapConfig and check the 'connection' property for the data source.");
        }
        // get the component manager
        final ComponentManager manager = CocoonComponentManager.getSitemapComponentManager();
        if ( manager == null ) {
            throw new RuntimeException("CocoonComponentManager is not available for " + this.getClass().getName() + "." +
            " Make sure that you're initializing iBatis during an active request and not on startup.");            
        }
        try {
            final ComponentSelector selector = (ComponentSelector)manager.lookup(DataSourceComponent.ROLE + "Selector");
            try {
                this.datasource = (DataSourceComponent)selector.select(connection);
            } catch (ComponentException e) {
                throw new CascadingRuntimeException("Unable to lookup data source with name " + connection + "." +
                        " Check the cocoon.xconf and the iBatis sqlMapConfig.", e);

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            }
            Cocoon c = (Cocoon) ClassUtils.newInstance("org.apache.cocoon.Cocoon");
            ContainerUtil.enableLogging(c, getCocoonLogger() );
            c.setLoggerManager( getLoggerManager() );
            ContainerUtil.contextualize(c, this.appContext);
            final ComponentManager parent = this.getParentComponentManager();
            if ( parent != null ) {
                ContainerUtil.compose(c, parent);
            }
            if (this.enableInstrumentation) {
                c.setInstrumentManager(getInstrumentManager());

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        throws Exception
    {
        Redirector redirector = new SitemapRedirector(this.environment);
        SourceResolver resolver = (SourceResolver)this.environment.getObjectModel()
            .get(OBJECT_SOURCE_RESOLVER);
        ComponentManager sitemapManager = CocoonComponentManager.getSitemapComponentManager();
        ComponentSelector actionSelector
            = (ComponentSelector)sitemapManager.lookup(Action.ROLE + "Selector");
        Action action = (Action)actionSelector.select(type);
        Map result = null;
        try {
            result = action.act(redirector,
                                resolver,

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    public Object jsFunction_inputModuleGetAttribute(String type, String attribute)
        throws Exception
    {
        // since no new components can be declared on sitemap we could
        // very well use the 'other' one here. Anyway, since it's there...
        ComponentManager sitemapManager = CocoonComponentManager.getSitemapComponentManager();
        ComponentSelector inputSelector = (ComponentSelector)sitemapManager
            .lookup(InputModule.ROLE + "Selector");
        InputModule input = (InputModule) inputSelector.select(type);
        Object result = null;
        try {
            result = input.getAttribute(attribute, null,

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