hu.icellmobilsoft.coffee.model.base.ClassFieldsAndMethodsCache Maven / Gradle / Ivy
/*-
* #%L
* Coffee
* %%
* Copyright (C) 2020 i-Cell Mobilsoft Zrt.
* %%
* 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.
* #L%
*/
package hu.icellmobilsoft.coffee.model.base;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.tuple.Pair;
/**
* Cache for fields and methods of entity classes used in {@link AbstractProvider}
*
* @param
* the type of keys maintained by this map
* @param
* the type of mapped values
*
* @author zsolt.vasi
* @since 2.0.0
*/
public class ClassFieldsAndMethodsCache, List>> extends LinkedHashMap {
private static final int DEFAULT_CACHE_SIZE = 10_000;
/**
* Size of cache
*/
private final int cacheSize;
/**
* Instantiates a new class fields and methods cache
*/
public ClassFieldsAndMethodsCache() {
this(DEFAULT_CACHE_SIZE);
}
/**
* Instantiates a new class fields and methods with the given cache size
*
* @param cacheSize
* the cache size
*/
public ClassFieldsAndMethodsCache(int cacheSize) {
super(cacheSize);
this.cacheSize = cacheSize;
}
private List getAllFields(Class clazz) {
if (clazz == null) {
return Collections.emptyList();
}
List result = new ArrayList<>(getAllFields(clazz.getSuperclass()));
result.addAll(Arrays.asList(clazz.getDeclaredFields()));
return Collections.unmodifiableList(result);
}
private List getAllMethods(Class clazz) {
if (clazz == null) {
return Collections.emptyList();
}
List result = new ArrayList<>(getAllMethods(clazz.getSuperclass()));
result.addAll(Arrays.asList(clazz.getDeclaredMethods()));
return Collections.unmodifiableList(result);
}
/**
* Gets a pair of fields and methods lists of the given class from cache if found
*
* @param clazz
* the class
* @return a pair of fields and methods
*/
public Pair, List> getFieldsAndMethods(Class clazz) {
// we should optimize this cache mechanics with CDI, we can collect all information after the AfterDeploymentValidation phase
if (this.containsKey(clazz)) {
return this.get(clazz);
}
V fieldMethodPair = (V) Pair.of(getAllFields(clazz), getAllMethods(clazz));
this.put((K) clazz, fieldMethodPair);
return fieldMethodPair;
}
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
return size() > cacheSize;
}
}