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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.openecomp.core.factory.impl;
import com.amdocs.zusammen.utils.facade.impl.FactoryConfig;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.commons.lang3.StringUtils;
import org.openecomp.core.utilities.CommonMethods;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCategory;
import org.openecomp.sdc.common.errors.ErrorCode;
public class FactoryManager {
private static final FactoryManager instance = new FactoryManager();
private static final String ERROR_CODE_E0001 = "E0001";
/**
* Temporary registry of default implementations. The map keeps class names rather then class
* types to allow unloading of those classes from memory by garbage collector if factory is not
* actually used.
*/
private final Map<String, String> factoryRegistry = new ConcurrentHashMap<>();
/**
* Cached factory instances.
*/
private final Map<String, AbstractFactoryBase> factoryInstanceMap = new ConcurrentHashMap<>();
private FactoryManager() {
initializeFactoryRegistry();
}
public static synchronized FactoryManager getInstance() {
return instance;
}
private void initializeFactoryRegistry() {
final Map<String, String> factoryMap = FactoryConfig.getFactoriesMap();
for (final Map.Entry<String, String> entry : factoryMap.entrySet()) {
final String abstractClassName = entry.getKey();
final String concreteTypeName = entry.getValue();
if (StringUtils.isEmpty(concreteTypeName)) {
throw new CoreException(
new ErrorCode.ErrorCodeBuilder().withId("E0003")
.withMessage("Missing configuration value:" + concreteTypeName + ".")
.withCategory(ErrorCategory.SYSTEM).build());
}
registerFactory(abstractClassName, concreteTypeName);
}
}
/**
* Instantiates the configured implementation of an abstract factory.
*
* @param <F> Type specific abstract factory for concrete Java interface
* @param factoryType Java class of type specific abstract factory
* @return Instance of implementation class
*/
@SuppressWarnings("unchecked")
public <F extends AbstractFactoryBase> F getFactoryInstance(Class<F> factoryType) {
if (factoryType == null) {
throw new CoreException(
new ErrorCode.ErrorCodeBuilder().withId(ERROR_CODE_E0001)
.withMessage("Mandatory input factory type.").withCategory(ErrorCategory.SYSTEM)
.build());
}
final String factoryTypeName = factoryType.getName();
// Check if the factory is already cached
if (factoryInstanceMap.get(factoryTypeName) == null) {
//if not, create a new one and cache it
// Get the implementation class name
final String implName = factoryRegistry.get(factoryTypeName);
if (StringUtils.isEmpty(implName)) {
throw new CoreException(
new ErrorCode.ErrorCodeBuilder().withId(ERROR_CODE_E0001)
.withMessage("Mandatory input factory implementation.")
.withCategory(ErrorCategory.SYSTEM).build());
}
F factory = CommonMethods.newInstance(implName, factoryType);
factory.init();
// Cache the instantiated singleton
factoryInstanceMap.putIfAbsent(factoryTypeName, factory);
}
return (F) factoryInstanceMap.get(factoryTypeName);
}
public void registerFactory(final String factoryName, final String implName) {
factoryRegistry.put(factoryName, implName);
}
/**
* Unregister factory and removes the cached instance if any.
* @param factoryName the factory name to unregister
*/
public void unregisterFactory(final String factoryName) {
final String factoryClass = factoryRegistry.get(factoryName);
if (StringUtils.isNotEmpty(factoryClass)) {
factoryInstanceMap.remove(factoryClass);
factoryRegistry.remove(factoryName);
}
}
/**
* Removes the cached factory instance if any.
*
* @param <F> the type parameter
* @param factory the factory
*/
public <F extends AbstractFactoryBase> void removeFactoryInstance(Class<F> factory) {
if (factory == null) {
throw new CoreException(
new ErrorCode.ErrorCodeBuilder().withId(ERROR_CODE_E0001).withMessage("Mandatory input factory.")
.withCategory(ErrorCategory.SYSTEM).build());
}
factoryInstanceMap.remove(factory.getName());
}
/**
* Stop all.
*/
public void stopAll() {
factoryInstanceMap.values().forEach(AbstractFactoryBase::stop);
}
}
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