/*
* Copyright 2004-2006 the original author or authors.
*
* Licensed 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.compass.core;
import java.io.Serializable;
import javax.naming.Referenceable;
import org.compass.core.config.CompassSettings;
import org.compass.core.engine.SearchEngineIndexManager;
import org.compass.core.engine.SearchEngineOptimizer;
import org.compass.core.engine.spellcheck.SearchEngineSpellCheckManager;
/**
* Creates a CompassSession. Usually an application has a single Compass object.
* Threads servicing client requests obtain sessions from Compass.
*
* <p>Implementors must be threadsafe.
*
* <p>CompassSessions are immutable. The behaviour of a Compass is controlled by
* settings supplied at configuration time through CompassConfiguration. These
* settings are defined on the web site.
*
* <p>Compass also provides operations that are on a higher level than a session,
* like create/delete operations on index data files and manages the index
* optimiser lifecycle.
*
* @author kimchy
* @see CompassSession
* @see org.compass.core.config.CompassConfiguration
*/
public interface Compass extends Referenceable, Serializable {
/**
* If there is a transaction bound session, will return it. Otherwise
* returns a new session.
*
* <p>A transactional bound session is bounded to the transaction when calling
* the CompassSession.beginTransaction() or if Compass tries to automatically join
* an already running transaction (see next paragraph).
*
* <p>If creating a new session, will try to automatically join an existing
* outer transaction. An outer transaction might be an already running Compass
* local transaction, or an external transaciton (JTA or Spring for example). In
* such cases, there is no need to perform any transaction managment code (begin
* or commit/rollback transaction) or closing the opened session. Compass will also
* bind the session to the same transaction if an outer transaction exists. Note, when
* doing so, the mentioned code will have to always be excuted within an already running
* transaction.
*
* @return CompassSession The compass session
* @throws CompassException
*/
CompassSession openSession() throws CompassException;
/**
* Closes Compass and releases any resources that are assoicated with it. It is
* very importnat to close an unused Compass instance since it might hold resources
* (such as file descriptor when storing the index within the file system) that
* will not be released otherwise.
*
* @throws CompassException
*/
void close() throws CompassException;
/**
* Clones the current <code>Compass</code> instance. The added settings will merged with the current
* compass settings, and control the creation of the new Compass.
*
* <p>Note, that the new instance will not be registered with JNDI, as well as not start the optimizer.
*
* @param addedSettings The settings to be added.
* @return the cloned compass instance.
*/
Compass clone(CompassSettings addedSettings);
/**
* Returns a resource factory allowing to create resources and properties.
*/
ResourceFactory getResourceFactory();
/**
* Retruns the search engine optimizer. You can controll the state of the
* optimizer (by calling <code>stop</code> or <code>start</code>), you
* can check if the index need optimization, and you can optimize the index.
*
* @return the search engine optimizer
*/
SearchEngineOptimizer getSearchEngineOptimizer();
/**
* Return the search engine index manager. You can control the index using
* it.
*
* @return the search engine index manager
*/
SearchEngineIndexManager getSearchEngineIndexManager();
/**
* Returns the spell check manager. Returns <code>null</code> if the spell check is not
* enabled.
*/
SearchEngineSpellCheckManager getSpellCheckManager();
/**
* Returns the settings Compass was started with.
*/
CompassSettings getSettings();
/**
* Returns <code>true</code> if the Compass instance is already closed
*/
boolean isClosed();
}
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