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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented
applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or
annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping
tools.
/**
* Copyright 2009-2015 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.apache.ibatis.mapping;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.apache.ibatis.cache.Cache;
import org.apache.ibatis.cache.CacheException;
import org.apache.ibatis.cache.decorators.BlockingCache;
import org.apache.ibatis.cache.decorators.LoggingCache;
import org.apache.ibatis.cache.decorators.LruCache;
import org.apache.ibatis.cache.decorators.ScheduledCache;
import org.apache.ibatis.cache.decorators.SerializedCache;
import org.apache.ibatis.cache.decorators.SynchronizedCache;
import org.apache.ibatis.cache.impl.PerpetualCache;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;
/**
* @author Clinton Begin
*/
public class CacheBuilder {
private String id;
private Class extends Cache> implementation;
private List> decorators;
private Integer size;
private Long clearInterval;
private boolean readWrite;
private Properties properties;
private boolean blocking;
public CacheBuilder(String id) {
this.id = id;
this.decorators = new ArrayList>();
}
public CacheBuilder implementation(Class extends Cache> implementation) {
this.implementation = implementation;
return this;
}
public CacheBuilder addDecorator(Class extends Cache> decorator) {
if (decorator != null) {
this.decorators.add(decorator);
}
return this;
}
public CacheBuilder size(Integer size) {
this.size = size;
return this;
}
public CacheBuilder clearInterval(Long clearInterval) {
this.clearInterval = clearInterval;
return this;
}
public CacheBuilder readWrite(boolean readWrite) {
this.readWrite = readWrite;
return this;
}
public CacheBuilder blocking(boolean blocking) {
this.blocking = blocking;
return this;
}
public CacheBuilder properties(Properties properties) {
this.properties = properties;
return this;
}
public Cache build() {
setDefaultImplementations();
Cache cache = newBaseCacheInstance(implementation, id);
setCacheProperties(cache);
// issue #352, do not apply decorators to custom caches
if (PerpetualCache.class.equals(cache.getClass())) {
for (Class extends Cache> decorator : decorators) {
cache = newCacheDecoratorInstance(decorator, cache);
setCacheProperties(cache);
}
cache = setStandardDecorators(cache);
} else if (!LoggingCache.class.isAssignableFrom(cache.getClass())) {
cache = new LoggingCache(cache);
}
return cache;
}
private void setDefaultImplementations() {
if (implementation == null) {
implementation = PerpetualCache.class;
if (decorators.isEmpty()) {
decorators.add(LruCache.class);
}
}
}
private Cache setStandardDecorators(Cache cache) {
try {
MetaObject metaCache = SystemMetaObject.forObject(cache);
if (size != null && metaCache.hasSetter("size")) {
metaCache.setValue("size", size);
}
if (clearInterval != null) {
cache = new ScheduledCache(cache);
((ScheduledCache) cache).setClearInterval(clearInterval);
}
if (readWrite) {
cache = new SerializedCache(cache);
}
cache = new LoggingCache(cache);
cache = new SynchronizedCache(cache);
if (blocking) {
cache = new BlockingCache(cache);
}
return cache;
} catch (Exception e) {
throw new CacheException("Error building standard cache decorators. Cause: " + e, e);
}
}
private void setCacheProperties(Cache cache) {
if (properties != null) {
MetaObject metaCache = SystemMetaObject.forObject(cache);
for (Map.Entry
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