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

Package org.apache.avalon.framework.component

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

org.apache.avalon.framework.component.Component
This interface identifies classes that can be used as Components by a Composable.
The contract surrounding the Component is that it is used, but not a user. When a class implements this interface, it is stating that other entities may use that class.

A Component is the basic building block of the Avalon Framework. When a class implements this interface, it allows itself to be managed by a ComponentManager and used by an outside element called a Composable. The Composable must know what type of Component it is accessing, so it will re-cast the Component into the type it needs.

In order for a Component to be useful you must either extend this interface, or implement this interface in conjunction with one that actually has methods. The new interface is the contract with the Composable that this is a particular type of component, and as such it can perform those functions on that type of component.

For example, we want a component that performs a logging function so we extend the Component to be a LoggingComponent.
```
 interface LoggingComponent extends Component { log(String message); } 
```
Now all Composables that want to use this type of component, will re-cast the Component into a LoggingComponent and the Composable will be able to use the log method.

Deprecated: Deprecated without replacement. Should only be used while migrating away from a system based on Composable/ComponentManager. A generic java.lang.Object can be used as a replacement.
@author Avalon Development Team @version CVS $Revision: 1.16 $ $Date: 2004/02/11 14:34:24 $

     * @exception ComponentException if a bundle is not found
     */
    public Component selectFromFilename(String fileName, boolean cacheAtStartup)
        throws ComponentException
    {
        Component bundle = _select(fileName, null, cacheAtStartup);
        if (bundle == null)
            throw new ComponentException("Unable to locate resource: " + fileName);
        return bundle;
    }

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     * @param fileName          file name of the bundle
     * @return                  the cached bundle; null, if not found
     */
    protected Component selectCached(String fileName)
    {
        Component bundle = null;
        try
        {
            bundle = super.select(fileName);
            if (logger.isDebugEnabled()) logger.debug("Returning from cache: " + fileName);
        }

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            this.parentSelector = newSelector;
        }
    }


    public Component select(Object hint) throws ComponentException {
        Component component = null;


        try {
            component = super.select(hint);
        } catch (ComponentException ce) {
            if (this.parentSelector != null) {

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     * @param hint the Configuration object used to look up the repository
     *
     * @return whether the mail store has a repository corresponding to this hint
     */
    public boolean hasComponent( Object hint ) {
        Component comp = null;
        try {
            comp = select(hint);
        } catch(ComponentException ex) {
            if (getLogger().isErrorEnabled()) {
                getLogger().error("Exception AvalonMailStore.hasComponent-" + ex.toString());

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            try {
                return super.select(hint);


            } catch(ComponentException ce) {
                // Doesn't exist here : try in parent selector
                Component component = this.parentSelector.select(hint);
                this.parentComponents.add(component);
                return component;
            }
        }
    }

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            try {
                return super.select(hint);


            } catch(ComponentException ce) {
                // Doesn't exist here : try in parent selector
                final Component component = this.parentSelector.select(hint);
                return component;
            }
        }
    }

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            if ( globalComponents != null) {


                final Iterator iter = globalComponents.values().iterator();
                while ( iter.hasNext() ) {
                    final Object[] o = (Object[])iter.next();
                    final Component c = (Component)o[0];
                    ((CocoonComponentManager)o[1]).releaseRLComponent( c );
                }
            }
            env.removeAttribute(GlobalRequestLifecycleComponent.class.getName());
        } else {

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        if ( null != stack && !stack.isEmpty()) {
            final Object[] objects = (Object[])stack.getCurrent();
            final Map objectModel = ((Environment)objects[0]).getObjectModel();
            EnvironmentDescription desc = (EnvironmentDescription)objectModel.get(PROCESS_KEY);
            if ( null != desc ) {
                Component component = desc.getRequestLifecycleComponent(role);
                if (null != component) {
                    return component;
                }
                component = desc.getGlobalRequestLifecycleComponent(role);
                if (null != component) {
                    return component;
                }
            }
        }


        final Component component = super.lookup(role);


        if (component != null && component instanceof RequestLifecycleComponent) {
            if (stack == null || stack.isEmpty()) {
                throw new ComponentException(role, "ComponentManager has no Environment Stack.");
            }

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        while (iter.hasNext()) {
            String role = (String)iter.next();
            getLogger().debug(".. "+role);
            if ( parentManager != null && parentManager.hasComponent( role ) ) {
                // lookup new component
                Component component = null;
                try {
                    component = this.lookup( role );
                    ((ParentAware)component).setParentLocator( new ComponentLocatorImpl(this.parentManager, role ));
                } catch (ComponentException ignore) {
                    // we don't set the parent then

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    synchronized void release() {
        if ( this.requestLifecycleComponents != null ) {
            final Iterator iter = this.requestLifecycleComponents.values().iterator();
            while (iter.hasNext()) {
                final Object[] o = (Object[])iter.next();
                final Component component = (Component)o[0];
                ((CocoonComponentManager)o[1]).releaseRLComponent( component );
            }
            this.requestLifecycleComponents.clear();
        }


        for (int i = 0; i < autoreleaseComponents.size(); i++) {
            final Object[] o = (Object[])autoreleaseComponents.get(i);
            final Component component = (Component)o[0];
            if (o[1] instanceof ComponentManager) {
                ((ComponentManager)o[1]).release( component );
            } else {
                ((ComponentSelector) o[1]).release(component);
                if (o[2] != null) {

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org.apache.avalon.excalibur.component.ComponentHandler

org.apache.avalon.excalibur.component.DefaultComponentFactory

org.apache.avalon.excalibur.component.ExcaliburComponentManager

org.apache.avalon.excalibur.component.ExcaliburComponentSelector

org.apache.avalon.excalibur.component.test.ComponentProxyGeneratorTestCase

org.apache.avalon.excalibur.component.test.ExcaliburComponentManagerTestCase

org.apache.cocoon.acting.ModularDatabaseAction

org.apache.cocoon.Cocoon

org.apache.cocoon.components.CocoonComponentManager

org.apache.cocoon.components.EnvironmentDescription

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