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 $

    throws IOException {


        ComponentSelector serializerSelector = null;
        Serializer serializer = null;
        // this.manager does not have Serializer
        ComponentManager manager = CocoonComponentManager.getSitemapComponentManager();
        try {
            serializerSelector = (ComponentSelector) manager.lookup(Serializer.ROLE + "Selector");
            serializer = (Serializer)serializerSelector.select("xml");
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            serializer.setOutputStream(os);


            toSAX(serializer);


            return new ByteArrayInputStream(os.toByteArray());
//        } catch (ServiceException e) {
//            throw new CascadingIOException("Could not lookup pipeline components", e);
        } catch (ComponentException e) {
            throw new CascadingIOException("Could not lookup pipeline components", e);
        } catch (Exception e) {
            throw new CascadingIOException("Exception during processing of " + getURI(), e);
        } finally {
            if (serializer != null) {
                serializerSelector.release(serializer);
            }
            if (serializerSelector != null) {
                manager.release(serializerSelector);
            }
        }
    }

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    protected Object makeNewServiceObject(
        MessageContext msgContext, String role
    )
        throws Exception
    {
        ComponentManager manager =
            (ComponentManager) msgContext.getProperty(COMPONENT_MANAGER);


        if (manager == null)
            throw new AxisFault("Could not access Avalon ComponentManager");


        return decorate(manager.lookup(role), manager);
    }

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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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  /**
   * @see org.apache.excalibur.source.Source#getInputStream()
   */
  public InputStream getInputStream() throws IOException, SourceNotFoundException {
        ComponentManager sitemapManager = CocoonComponentManager.getSitemapComponentManager();
        ComponentSelector serializerSelector = null;
        Serializer serializer = null;
        try {
            serializerSelector = (ComponentSelector) sitemapManager.lookup(Serializer.ROLE+"Selector");
            serializer = (Serializer) serializerSelector.select("html");
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            serializer.setOutputStream(os);
            this.toSAX(serializer);
            return new ByteArrayInputStream(os.toByteArray());
        } catch (SAXException se) {
            throw new CascadingIOException("Unable to stream content.", se);
        } catch (ComponentException ce) {
            throw new CascadingIOException("Unable to get components for serializing.", ce);
        } finally {
            if ( serializer != null ) {
                serializerSelector.release(serializer);
            }
            sitemapManager.release(serializerSelector);
        }
  }

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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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   * @exception Exception if an error occurs during parsing.
   */
  public Value parse(Value sManager, Value ssource)
    throws Exception
  {
    ComponentManager manager = componentManager(sManager);
    Source source = source(ssource);


    Parser parser = (Parser)manager.lookup(Parser.ROLE);
    XMLtoSXML handler = new XMLtoSXML();
    parser.setContentHandler(handler);
    InputSource input = new InputSource(source.getInputStream());
    parser.parse(input);


    SchemeInterpreter interpreters
      = (SchemeInterpreter)manager.lookup(SchemeInterpreter.ROLE);
    Symbol mainFunction = interpreters.getMainFunction();
    Interpreter interp = interpreters.getInterpreter();


    try {
      return interp.eval(handler.getContent());

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        }
        if (getInitParameter("target_column") == null) {
            throw new MailetException("target_column not specified for JDBCAlias");
        }
        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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        String tableName = datasourceName.substring(pos + 1);
        datasourceName = datasourceName.substring(0, pos);
        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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            autoBracket = new Boolean(getInitParameter("autobracket")).booleanValue();
        } catch (Exception e) {
            // Ignore any exceptions, default to true
        }


        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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        sendPartial = (getInitParameter("sendpartial") == null) ? false : new Boolean(getInitParameter("sendpartial")).booleanValue();


        gatewayServer = getInitParameter("gateway");
        gatewayPort = getInitParameter("gatewayPort");


        ComponentManager compMgr = (ComponentManager)getMailetContext().getAttribute(Constants.AVALON_COMPONENT_MANAGER);
        String outgoingPath = getInitParameter("outgoing");
        if (outgoingPath == null) {
            outgoingPath = "file:///../var/mail/outgoing";
        }


        try {
            // Instantiate the a MailRepository for outgoing mails
            MailStore mailstore = (MailStore) compMgr.lookup("org.apache.james.services.MailStore");


            DefaultConfiguration spoolConf
                = new DefaultConfiguration("repository", "generated:RemoteDelivery.java");
            spoolConf.setAttribute("destinationURL", outgoingPath);
            spoolConf.setAttribute("type", "SPOOL");

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