001    // Copyright 2006, 2008, 2009 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.ioc;
016    
017    /**
018     * The source for the module instance needed by any service builders, service contributors and service decorators that
019     * are mapped to instance methods.
020     * <p/>
021     * Allows the creation of the module instance to be deferred until actually needed; in practical terms, when the
022     * builder/decorator/contributor is a <em>static</em> method on the module builder class, then a module instance is not
023     * needed. This allows Tapestry IOC to work around a tricky chicken-and-the-egg problem, whereby the constructor of a
024     * module instance requires contributions that originate in the same module.
025     * <p/>
026     * The term "module builder" has been deprecated; the current term is "module class", but this interface is left as-is
027     * for backwards compatibility.
028     */
029    public interface ModuleBuilderSource
030    {
031        /**
032         * Returns the instantiated version of the Tapestry IoC module class.
033         */
034        Object getModuleBuilder();
035    }