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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina;
import java.util.Set;
/**
* <p>
* Interface describing a collection of Valves that should be executed in sequence when the <code>invoke()</code> method
* is invoked. It is required that a Valve somewhere in the pipeline (usually the last one) must process the request and
* create the corresponding response, rather than trying to pass the request on.
* </p>
* <p>
* There is generally a single Pipeline instance associated with each Container. The container's normal request
* processing functionality is generally encapsulated in a container-specific Valve, which should always be executed at
* the end of a pipeline. To facilitate this, the <code>setBasic()</code> method is provided to set the Valve instance
* that will always be executed last. Other Valves will be executed in the order that they were added, before the basic
* Valve is executed.
* </p>
*
* @author Craig R. McClanahan
* @author Peter Donald
*/
public interface Pipeline extends Contained {
/**
* @return the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
*/
Valve getBasic();
/**
* <p>
* Set the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any). Prior to
* setting the basic Valve, the Valve's <code>setContainer()</code> will be called, if it implements
* <code>Contained</code>, with the owning Container as an argument. The method may throw an
* <code>IllegalArgumentException</code> if this Valve chooses not to be associated with this Container, or
* <code>IllegalStateException</code> if it is already associated with a different Container.
* </p>
*
* @param valve Valve to be distinguished as the basic Valve
*/
void setBasic(Valve valve);
/**
* <p>
* Add a new Valve to the end of the pipeline associated with this Container. Prior to adding the Valve, the Valve's
* <code>setContainer()</code> method will be called, if it implements <code>Contained</code>, with the owning
* Container as an argument. The method may throw an <code>IllegalArgumentException</code> if this Valve chooses not
* to be associated with this Container, or <code>IllegalStateException</code> if it is already associated with a
* different Container.
* </p>
* <p>
* Implementation note: Implementations are expected to trigger the {@link Container#ADD_VALVE_EVENT} for the
* associated container if this call is successful.
* </p>
*
* @param valve Valve to be added
*
* @exception IllegalArgumentException if this Container refused to accept the specified Valve
* @exception IllegalArgumentException if the specified Valve refuses to be associated with this Container
* @exception IllegalStateException if the specified Valve is already associated with a different Container
*/
void addValve(Valve valve);
/**
* @return the array of Valves in the pipeline associated with this Container, including the basic Valve (if any).
* If there are no such Valves, a zero-length array is returned.
*/
Valve[] getValves();
/**
* Remove the specified Valve from the pipeline associated with this Container, if it is found; otherwise, do
* nothing. If the Valve is found and removed, the Valve's <code>setContainer(null)</code> method will be called if
* it implements <code>Contained</code>.
* <p>
* Implementation note: Implementations are expected to trigger the {@link Container#REMOVE_VALVE_EVENT} for the
* associated container if this call is successful.
* </p>
*
* @param valve Valve to be removed
*/
void removeValve(Valve valve);
/**
* @return the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
*/
Valve getFirst();
/**
* Returns true if all the valves in this pipeline support async, false otherwise
*
* @return true if all the valves in this pipeline support async, false otherwise
*/
boolean isAsyncSupported();
/**
* Identifies the Valves, if any, in this Pipeline that do not support async.
*
* @param result The Set to which the fully qualified class names of each Valve in this Pipeline that does not
* support async will be added
*/
void findNonAsyncValves(Set<String> result);
}
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