/*
* Copyright 2007-2010 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.impalaframework.module.operation;
import org.impalaframework.module.ModuleDefinition;
import org.impalaframework.module.ModuleState;
import org.impalaframework.module.RootModuleDefinition;
import org.impalaframework.module.modification.ModificationExtractorRegistry;
import org.impalaframework.module.spi.Application;
import org.impalaframework.module.spi.ModificationExtractor;
import org.impalaframework.module.spi.ModificationExtractorType;
import org.impalaframework.module.spi.ModuleStateHolder;
import org.impalaframework.module.spi.TransitionResultSet;
import org.impalaframework.module.spi.TransitionSet;
import org.springframework.util.Assert;
/**
* {@link ModuleOperation} implementation which contains functionality for implementing reloading of a named module.
* Unlike {@link ReloadModuleNamedLikeOperation}, this class requires an exact match of the module to be renamed.
* It searches the module hierarchy/graph, and reloads the first module whose name equals the supplied
* String.
*
* @see ReloadNamedModuleLikeOperation
* @author Phil Zoio
*/
public class ReloadNamedModuleOperation extends BaseModuleOperation {
protected ReloadNamedModuleOperation() {
super();
}
public ModuleOperationResult doExecute(Application application, ModuleOperationInput moduleOperationInput) {
Assert.notNull(moduleOperationInput, "moduleOperationInput cannot be null");
String moduleToReload = moduleOperationInput.getModuleName();
Assert.notNull(moduleToReload, "moduleName is required as it specifies the name of the module to reload in "
+ this.getClass().getName());
ModuleStateHolder moduleStateHolder = application.getModuleStateHolder();
RootModuleDefinition oldRootDefinition = moduleStateHolder.cloneRootModuleDefinition();
RootModuleDefinition newRootDefinition = moduleStateHolder.cloneRootModuleDefinition();
ModificationExtractorRegistry modificationExtractor = getModificationExtractorRegistry();
ModificationExtractor calculator = modificationExtractor
.getModificationExtractor(ModificationExtractorType.STRICT);
ModuleDefinition childDefinition = newRootDefinition.findChildDefinition(moduleToReload, true);
if (childDefinition != null) {
childDefinition.setState(ModuleState.STALE);
TransitionSet transitions = calculator.getTransitions(application, oldRootDefinition, newRootDefinition);
TransitionResultSet transitionResultSet = getTransitionManager().processTransitions(moduleStateHolder, application, transitions);
boolean result = !transitions.getModuleTransitions().isEmpty();
return result ? new ModuleOperationResult(transitionResultSet) : ModuleOperationResult.EMPTY;
}
return ModuleOperationResult.EMPTY;
}
}