Examples of org.apache.mina.common.IoFilter

org.apache.mina.common.IoFilter
A filter which intercepts {@link IoHandler} events like Servletfilters. Filters can be used for these purposes:
- Event logging,
- Performance measurement,
- Authorization,
- Overload control,
- Message transformation (e.g. encryption and decryption, ...),
- and many more.
Please NEVER implement your filters to wrap {@link IoSession}s. Users can cache the reference to the session, which might malfunction if any filters are added or removed later.
The Life Cycle
{@link IoFilter}s are activated only when they are inside {@link IoFilterChain}.
When you add an {@link IoFilter} to an {@link IoFilterChain}:
1. {@link #init()} is invoked by {@link ReferenceCountingIoFilter} ifthe filter is added at the first time.
2. {@link #onPreAdd(IoFilterChain,String,NextFilter)} is invoked to notifythat the filter will be added to the chain.
3. The filter is added to the chain, and all events and I/O requests pass through the filter from now.
4. {@link #onPostAdd(IoFilterChain,String,NextFilter)} is invoked to notifythat the filter is added to the chain.
5. The filter is removed from the chain if {@link #onPostAdd(IoFilterChain,String,org.apache.mina.common.IoFilter.NextFilter)}threw an exception. {@link #destroy()} is also invoked by{@link ReferenceCountingIoFilter} if the filter is the last filter whichwas added to {@link IoFilterChain}s.
When you remove an {@link IoFilter} from an {@link IoFilterChain}:
1. {@link #onPreRemove(IoFilterChain,String,NextFilter)} is invoked tonotify that the filter will be removed from the chain.
2. The filter is removed from the chain, and any events and I/O requests don't pass through the filter from now.
3. {@link #onPostRemove(IoFilterChain,String,NextFilter)} is invoked tonotify that the filter is removed from the chain.
4. {@link #destroy()} is invoked by {@link ReferenceCountingIoFilter} ifthe removed filter was the last one.
@author The Apache Directory Project (mina-dev@directory.apache.org) @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $ @see IoFilterAdapter

        }
    }


    private void deregister( EntryImpl entry )
    {
        IoFilter filter = entry.getFilter();


        try
        {
            filter.onPreRemove( this, entry.getName(), entry.getNextFilter() );
        }
        catch( Exception e )
        {
            throw new IoFilterLifeCycleException( "onPreRemove(): " + entry.getName() + ':' + filter
                                                  + " in " + getSession(), e );
        }


        deregister0( entry );


        try
        {
            filter.onPostRemove( this, entry.getName(), entry.getNextFilter() );
        }
        catch( Exception e )
        {
            throw new IoFilterLifeCycleException( "onPostRemove(): " + entry.getName() + ':' + filter
                                                  + " in " + getSession(), e );

View Full Code Here

    }


    @Override
    protected Context createJndiContext() throws Exception {
        JndiContext answer = new JndiContext();
        IoFilter myFilter = new TestFilter();
        List<IoFilter> myFilters = new ArrayList<IoFilter>();
        myFilters.add(myFilter);


        answer.bind("myFilters", myFilters);
        answer.bind("myFilter", myFilter);

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 */
public class IoFilterMappingTest extends TestCase
{
    public void testConstructor() throws Exception
    {
        IoFilter filter = ( IoFilter ) MockControl.createControl(
                IoFilter.class ).getMock();


        try
        {
            new IoFilterMapping( null, filter );

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        }
    }
    
    private void deregister( EntryImpl entry )
    {
        IoFilter filter = entry.getFilter();
        IoFilterLifeCycleManager lifeCycleManager = IoFilterLifeCycleManager.getInstance();
        
        lifeCycleManager.callOnPreRemove( this, entry.getName(), filter, entry.getNextFilter() );
        
        deregister0( entry );

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 * @author The Apache Directory Project (mina-dev@directory.apache.org)
 * @version $Rev: 555855 $, $Date: 2007-07-13 05:19:00 +0200 (Fri, 13 Jul 2007) $
 */
public class IoFilterMappingTest extends TestCase {
    public void testConstructor() throws Exception {
        IoFilter filter = (IoFilter) MockControl.createControl(IoFilter.class)
                .getMock();


        try {
            new IoFilterMapping(null, filter);
            fail("null name. IllegalArgumentException expected.");

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 */
public class IoFilterMappingTest extends TestCase
{
    public void testConstructor() throws Exception
    {
        IoFilter filter = ( IoFilter ) MockControl.createControl(
                IoFilter.class ).getMock();


        try
        {
            new IoFilterMapping( null, filter );

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    @Override
    public void onPostAdd(
            IoFilterChain parent, String name, NextFilter nextFilter) throws Exception {
        
        // My previous filter must be an ExecutorFilter.
        IoFilter lastFilter = null;
        for (IoFilterChain.Entry e: parent.getAll()) {
            IoFilter currentFilter = e.getFilter();
            if (currentFilter == this) {
                if (lastFilter instanceof ExecutorFilter) {
                    // Good!
                    break;
                } else {

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    @Override
    public void onPostAdd(
            IoFilterChain parent, String name, NextFilter nextFilter) throws Exception {
        
        // My previous filter must be an ExecutorFilter.
        IoFilter lastFilter = null;
        for (IoFilterChain.Entry e: parent.getAll()) {
            IoFilter currentFilter = e.getFilter();
            if (currentFilter == this) {
                if (lastFilter instanceof ExecutorFilter) {
                    // Good!
                    break;
                } else {

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    @Override
    protected Object invoke0(String name, Object[] params, String[] signature) throws Exception {
        if (name.equals("addFilterFirst")) {
            String filterName = (String) params[0];
            ObjectName filterRef = (ObjectName) params[1];
            IoFilter filter = getFilter(filterRef);
            getSource().getFilterChain().addFirst(filterName, filter);
            return null;
        }
        
        if (name.equals("addFilterLast")) {
            String filterName = (String) params[0];
            ObjectName filterRef = (ObjectName) params[1];
            IoFilter filter = getFilter(filterRef);
            getSource().getFilterChain().addLast(filterName, filter);
            return null;
        }
        
        if (name.equals("addFilterBefore")) {
            String filterBaseName = (String) params[0];
            String filterName = (String) params[1];
            ObjectName filterRef = (ObjectName) params[2];
            IoFilter filter = getFilter(filterRef);
            getSource().getFilterChain().addBefore(filterBaseName, filterName, filter);
            return null;
        }
        
        if (name.equals("addFilterAfter")) {
            String filterBaseName = (String) params[0];
            String filterName = (String) params[1];
            ObjectName filterRef = (ObjectName) params[2];
            IoFilter filter = getFilter(filterRef);
            getSource().getFilterChain().addAfter(filterBaseName, filterName, filter);
            return null;
        }
        
        if (name.equals("removeFilter")) {

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                    + filter + " in " + getSession(), e);
        }
    }


    private void deregister(EntryImpl entry) {
        IoFilter filter = entry.getFilter();


        try {
            filter.onPreRemove(this, entry.getName(), entry.getNextFilter());
        } catch (Exception e) {
            throw new IoFilterLifeCycleException("onPreRemove(): "
                    + entry.getName() + ':' + filter + " in " + getSession(), e);
        }


        deregister0(entry);


        try {
            filter.onPostRemove(this, entry.getName(), entry.getNextFilter());
        } catch (Exception e) {
            throw new IoFilterLifeCycleException("onPostRemove(): "
                    + entry.getName() + ':' + filter + " in " + getSession(), e);
        }
    }

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Examples of org.apache.mina.common.IoFilter

The Life Cycle

Related Classes of org.apache.mina.common.IoFilter