package org.nutz.ioc.impl;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.nutz.ioc.Ioc2;
import org.nutz.ioc.IocContext;
import org.nutz.ioc.IocException;
import org.nutz.ioc.IocLoader;
import org.nutz.ioc.IocLoading;
import org.nutz.ioc.IocMaking;
import org.nutz.ioc.ObjectMaker;
import org.nutz.ioc.ObjectProxy;
import org.nutz.ioc.ValueProxyMaker;
import org.nutz.ioc.annotation.InjectName;
import org.nutz.ioc.aop.MirrorFactory;
import org.nutz.ioc.aop.impl.DefaultMirrorFactory;
import org.nutz.ioc.loader.annotation.IocBean;
import org.nutz.ioc.loader.cached.CachedIocLoader;
import org.nutz.ioc.loader.cached.CachedIocLoaderImpl;
import org.nutz.ioc.meta.IocObject;
import org.nutz.lang.Lang;
import org.nutz.lang.Strings;
import org.nutz.log.Log;
import org.nutz.log.Logs;
import org.nutz.repo.LevenshteinDistance;
/**
*
* @author zozoh(zozohtnt@gmail.com)
* @author wendal(wendal1985@gmail.com)
*/
public class NutIoc implements Ioc2 {
private static final Object lock_get = new Object();
private static final Log log = Logs.get();
private static final String DEF_SCOPE = "app";
/**
* 读取配置文件的 Loader
*/
private IocLoader loader;
/**
* 缓存对象上下文环境
*/
private IocContext context;
/**
* 装配对象的逻辑
*/
private ObjectMaker maker;
/**
* 可扩展的"字段值"生成器
*/
private List<ValueProxyMaker> vpms;
/**
* 反射工厂，封装 AOP 的逻辑
*/
private MirrorFactory mirrors;
/**
* 对象默认生命周期范围名
*/
private String defaultScope;
/**
* <ul>
* <li>缓存支持的对象值类型
* <li>如果 addValueProxyMaker() 被调用，这个缓存会被清空
* <li>createLoading() 将会检查这个缓存
* </ul>
*/
private Set<String> supportedTypes;
public NutIoc(IocLoader loader) {
this(loader, new ScopeContext(DEF_SCOPE), DEF_SCOPE);
}
public NutIoc(IocLoader loader, IocContext context, String defaultScope) {
this(new ObjectMakerImpl(), loader, context, defaultScope);
}
protected NutIoc(ObjectMaker maker, IocLoader loader, IocContext context, String defaultScope) {
this(maker, loader, context, defaultScope, null);
}
protected NutIoc( ObjectMaker maker,
IocLoader loader,
IocContext context,
String defaultScope,
MirrorFactory mirrors) {
this.maker = maker;
this.defaultScope = defaultScope;
this.context = context;
if (loader instanceof CachedIocLoader)
this.loader = loader;
else
this.loader = CachedIocLoaderImpl.create(loader);
vpms = new ArrayList<ValueProxyMaker>(5); // 预留五个位置，足够了吧
addValueProxyMaker(new DefaultValueProxyMaker());
// 初始化类工厂， 这是同 AOP 的连接点
if (mirrors == null)
this.mirrors = new DefaultMirrorFactory(this);
else
this.mirrors = mirrors;
}
/**
* @return 一个新创建的 IocLoading 对象
*/
private IocLoading createLoading() {
if (null == supportedTypes) {
synchronized (this) {
if (null == supportedTypes) {
// TODO 看看可不可以改成更快的 Set
supportedTypes = new HashSet<String>();
for (ValueProxyMaker maker : vpms) {
String[] ss = maker.supportedTypes();
if (ss != null)
for (String s : ss)
supportedTypes.add(s);
}
}
}
}
return new IocLoading(supportedTypes);
}
public <T> T get(Class<T> type) throws IocException {
InjectName inm = type.getAnnotation(InjectName.class);
if (null != inm && (!Strings.isBlank(inm.value())))
return get(type, inm.value());
IocBean iocBean = type.getAnnotation(IocBean.class);
if (iocBean != null && (!Strings.isBlank(iocBean.name())))
return get(type, iocBean.name());
return get(type, Strings.lowerFirst(type.getSimpleName()));
}
public <T> T get(Class<T> type, String name, IocContext context) throws IocException {
if (log.isDebugEnabled())
log.debugf("Get '%s'<%s>", name, type);
// 创建对象创建时
IocMaking ing = makeIocMaking(context, name);
IocContext cntx = ing.getContext();
// 从上下文缓存中获取对象代理
ObjectProxy op = cntx.fetch(name);
// 如果未发现对象
if (null == op) {
// 线程同步
synchronized (lock_get) {
// 再次读取
op = cntx.fetch(name);
// 如果未发现对象
if (null == op) {
try {
if (log.isDebugEnabled())
log.debug("\t >> Load definition");
// 读取对象定义
IocObject iobj = loader.load(createLoading(), name);
if (null == iobj) {
for (String iocBeanName : loader.getName()) {
// 相似性少于3 --> 大小写错误,1-2个字符调换顺序或写错
if (3 > LevenshteinDistance.computeLevenshteinDistance(name.toLowerCase(), iocBeanName.toLowerCase())) {
throw new IocException("Undefined object '%s' but found similar name '%s'", name, iocBeanName);
}
}
throw new IocException("Undefined object '%s'", name);
}
// 修正对象类型
if (null == iobj.getType())
if (null == type)
throw new IocException("NULL TYPE object '%s'", name);
else
iobj.setType(type);
// 检查对象级别
if (Strings.isBlank(iobj.getScope()))
iobj.setScope(defaultScope);
// 根据对象定义，创建对象，maker 会自动的缓存对象到 context 中
if (log.isDebugEnabled())
log.debugf("\t >> Make...'%s'<%s>", name, type);
op = maker.make(ing, iobj);
}
// 处理异常
catch (IocException e) {
throw e;
}
catch (Throwable e) {
throw new IocException(Lang.unwrapThrow(e), "For object [%s] - type:[%s]", name, type);
}
}
}
}
synchronized (lock_get) {
return (T) op.get(type, ing);
}
}
public <T> T get(Class<T> type, String name) {
return this.get(type, name, null);
}
public boolean has(String name) {
return loader.has(name);
}
private boolean deposed = false;
public void depose() {
if (deposed) {
if (log.isInfoEnabled())
log.info("You can't depose a Ioc twice!");
return;
}
context.depose();
deposed = true;
if (loader instanceof CachedIocLoader)
((CachedIocLoader) loader).clear();
if (log.isDebugEnabled())
log.debug("!!!Ioc is deposed, you can't use it anymore");
}
public void reset() {
context.clear();
if (loader instanceof CachedIocLoader)
((CachedIocLoader) loader).clear();
}
public String[] getNames() {
return loader.getName();
}
public void addValueProxyMaker(ValueProxyMaker vpm) {
vpms.add(0, vpm);// 优先使用最后加入的ValueProxyMaker
}
public IocContext getIocContext() {
return context;
}
public void setMaker(ObjectMaker maker) {
this.maker = maker;
}
public void setMirrorFactory(MirrorFactory mirrors) {
this.mirrors = mirrors;
}
public void setDefaultScope(String defaultScope) {
this.defaultScope = defaultScope;
}
/**
* 暴露IocMaking的创建过程
*/
public IocMaking makeIocMaking(IocContext context, String name) {
// 连接上下文
IocContext cntx;
if (null == context || context == this.context)
cntx = this.context;
else {
if (log.isTraceEnabled())
log.trace("Link contexts");
cntx = new ComboContext(context, this.context);
}
return new IocMaking(this, mirrors, cntx, maker, vpms, name);
}
@Override
public String toString() {
return "/*NutIoc*/\n{\nloader:" + loader + ",\n}";
}
@Override
protected void finalize() throws Throwable {
if (!deposed) {
if (log.isInfoEnabled())
log.info("Ioc depose tigger by finalize(), not a good idea!");
depose();
}
}
}