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core functionalities of asta4d framework, including template and snippt implemention
/*
* Copyright 2012 astamuse company,Ltd.
*
* 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 com.astamuse.asta4d.data;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.reflect.FieldUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.astamuse.asta4d.Configuration;
import com.astamuse.asta4d.Context;
import com.astamuse.asta4d.data.annotation.ContextData;
import com.astamuse.asta4d.data.annotation.ContextDataSet;
import com.astamuse.asta4d.util.annotation.AnnotatedPropertyInfo;
import com.astamuse.asta4d.util.annotation.AnnotatedPropertyUtil;
import com.astamuse.asta4d.util.annotation.ConvertableAnnotationRetriever;
import com.thoughtworks.paranamer.AdaptiveParanamer;
import com.thoughtworks.paranamer.Paranamer;
/**
* This class is a function holder to supply functionalities about data injection
*
* @author e-ryu
*
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public class InjectUtil {
private final static Logger logger = LoggerFactory.getLogger(InjectUtil.class);
private static final String ContextDataSetSingletonMapKey = "ContextDataSetSingletonMapKey#" + InjectUtil.class.getName();
public static final String ContextDataNotFoundScope = "#ContextDataNotFoundScope";
public static final String ContextDataTypeUnMatchScope = "#ContextDataTypeUnMatchScope";
/**
* A class that present the injectable target information
*
* @author e-ryu
*
*/
private static class TargetInfo {
AnnotatedPropertyInfo propertyInfo;
String name;
String scope;
TypeUnMacthPolicy typeUnMatch;
ContextDataSetFactory contextDataSetFactory;
boolean isContextDataSetSingletonInContext;
Class type;
boolean isContextDataHolder;
Object defaultValue;
void fixForPrimitiveType() {
TypeInfo typeInfo = new TypeInfo(type);
type = typeInfo.getType();
defaultValue = typeInfo.getDefaultValue();
}
ContextDataHolder createDataHolderInstance() throws InstantiationException, IllegalAccessException {
if (isContextDataHolder) {
return (ContextDataHolder) type.newInstance();
} else {
return new ContextDataHolder(type);
}
}
}
private static class MethodInfo extends TargetInfo {
Method method;
}
private static class FieldInfo extends TargetInfo {
Field field;
}
private static class InstanceWireTarget {
List setFieldList = new ArrayList<>();
List getFieldList = new ArrayList<>();
List setMethodList = new ArrayList<>();
List getMethodList = new ArrayList<>();
}
private final static ConcurrentHashMap InstanceTargetCache = new ConcurrentHashMap<>();
private final static ConcurrentHashMap> MethodTargetCache = new ConcurrentHashMap<>();
private final static Paranamer paranamer = new AdaptiveParanamer();
public final static Object retrieveContextDataSetInstance(Class cls, String searchName, String searchScope)
throws DataOperationException {
try {
ContextDataSet cds = ConvertableAnnotationRetriever.retrieveAnnotation(ContextDataSet.class, cls.getAnnotations());
TargetInfo info = new TargetInfo();
info.contextDataSetFactory = cds.factory().newInstance();
info.isContextDataSetSingletonInContext = cds.singletonInContext();
info.defaultValue = null;
info.name = searchName;
info.scope = searchScope;
info.type = cls;
info.typeUnMatch = TypeUnMacthPolicy.EXCEPTION;
ContextDataHolder result = findValueForTarget(info, null);
if (result == null) {
return null;
} else {
return result.getValue();
}
} catch (IllegalAccessException | InstantiationException e) {
throw new DataOperationException(e.getMessage(), e);
}
}
/**
* Set the value of all the fields marked by {@link ContextData} of the given instance.
*
* @param instance
* @throws DataOperationException
*/
public final static void injectToInstance(Object instance) throws DataOperationException {
InstanceWireTarget target = getInstanceTarget(instance);
for (FieldInfo fi : target.setFieldList) {
try {
ContextDataHolder valueHolder = null;
if (fi.isContextDataHolder) {
valueHolder = (ContextDataHolder) FieldUtils.readField(fi.field, instance);
}
if (valueHolder == null) {
valueHolder = fi.createDataHolderInstance();
}
Class searchType = valueHolder.getTypeCls();
if (searchType == null) {
throw new DataOperationException(
fi.field.getName() +
" should be initialized at first or we can not retrieve the type you want since it is a type of CotnextDataHolder. " +
"You can also define an extended class to return the type class, in this case, you do not need to initialized it by your self");
}
ContextDataHolder foundData = findValueForTarget(fi, searchType);
handleTypeUnMatch(instance, fi, foundData);
if (fi.isContextDataHolder) {
transferDataHolder(foundData, valueHolder);
FieldUtils.writeField(fi.field, instance, valueHolder, true);
} else {
FieldUtils.writeField(fi.field, instance, foundData.getValue(), true);
}
} catch (IllegalAccessException | IllegalArgumentException | InstantiationException e) {
throw new DataOperationException("Exception when inject value to " + fi.field.toString(), e);
}
}
for (MethodInfo mi : target.setMethodList) {
try {
ContextDataHolder valueHolder = mi.createDataHolderInstance();
Class searchType = valueHolder.getTypeCls();
if (searchType == null) {
throw new DataOperationException(mi.method.getName() + " cannot initialize an instance of " +
valueHolder.getClass().getName() + ". You should define an extended class to return the type class");
}
ContextDataHolder foundData = findValueForTarget(mi, searchType);
handleTypeUnMatch(instance, mi, foundData);
if (mi.isContextDataHolder) {
transferDataHolder(foundData, valueHolder);
mi.method.invoke(instance, valueHolder);
} else {
mi.method.invoke(instance, foundData.getValue());
}
} catch (IllegalAccessException | IllegalArgumentException | InstantiationException | InvocationTargetException e) {
throw new DataOperationException("Exception when inject value to " + mi.method.toString(), e);
}
}
}
private static void handleTypeUnMatch(Object instance, FieldInfo target, ContextDataHolder valueHolder) throws DataOperationException {
handleTypeUnMatch(instance, target.field, null, null, -1, target, valueHolder);
}
private static void handleTypeUnMatch(Object instance, MethodInfo target, ContextDataHolder valueHolder) throws DataOperationException {
handleTypeUnMatch(instance, null, target.method, null, -1, target, valueHolder);
}
private static void handleTypeUnMatch(Method method, int methodParameterIndex, TargetInfo target, ContextDataHolder valueHolder)
throws DataOperationException {
handleTypeUnMatch(null, null, null, method, methodParameterIndex, target, valueHolder);
}
private static void handleTypeUnMatch(Object instance, Field field, Method setter, Method method, int methodParameterIndex,
TargetInfo target, ContextDataHolder valueHolder) throws DataOperationException {
// type unmatched
if (ContextDataTypeUnMatchScope.equals(valueHolder.getScope())) {
switch (target.typeUnMatch) {
case EXCEPTION:
String msg = "Found data(%s) cannot be coverted from [%s] to [%s].";
msg = String.format(msg, valueHolder.getFoundOriginalData(), valueHolder.getFoundOriginalData().getClass(), target.type);
throw new DataOperationException(msg);
case DEFAULT_VALUE:
valueHolder.setData(valueHolder.getName(), valueHolder.getScope(), target.defaultValue);
break;
case DEFAULT_VALUE_AND_TRACE:
ContextDataHolder traceHolder = new ContextDataHolder();
transferDataHolder(valueHolder, traceHolder);
if (field != null) {
InjectTrace.saveInstanceInjectionTraceInfo(instance, field, traceHolder);
} else if (setter != null) {
InjectTrace.saveInstanceInjectionTraceInfo(instance, setter, traceHolder);
} else if (method != null) {
InjectTrace.saveMethodInjectionTraceInfo(method, methodParameterIndex, traceHolder);
}
valueHolder.setData(valueHolder.getName(), valueHolder.getScope(), target.defaultValue);
break;
}
}
}
private static void transferDataHolder(ContextDataHolder from, ContextDataHolder to) {
to.setData(from.getName(), from.getScope(), from.getFoundOriginalData(), from.getValue());
}
private static ContextDataHolder findValueForTarget(TargetInfo targetInfo, Class overrideSearchType) throws DataOperationException {
Context context = Context.getCurrentThreadContext();
ContextDataFinder dataFinder = Configuration.getConfiguration().getContextDataFinder();
Class searchType = overrideSearchType == null ? targetInfo.type : overrideSearchType;
ContextDataHolder valueHolder = dataFinder.findDataInContext(context, targetInfo.scope, targetInfo.name, searchType);
if (valueHolder == null && targetInfo.contextDataSetFactory != null) {
Object value;
if (targetInfo.isContextDataSetSingletonInContext) {
// this map was initialized when the context was initialized
HashMap cdSetSingletonMap = context.getData(ContextDataSetSingletonMapKey);
// we must synchronize it to avoid concurrent access on the map
synchronized (cdSetSingletonMap) {
String clsName = targetInfo.type.getName();
value = cdSetSingletonMap.get(clsName);
if (value == null) {
value = targetInfo.contextDataSetFactory.createInstance(targetInfo.type);
injectToInstance(value);
cdSetSingletonMap.put(clsName, value);
}
}
} else {
value = targetInfo.contextDataSetFactory.createInstance(targetInfo.type);
injectToInstance(value);
}
valueHolder = new ContextDataHolder(targetInfo.name, targetInfo.scope, value);
} else if (valueHolder == null) {
valueHolder = new ContextDataHolder(targetInfo.name, ContextDataNotFoundScope, targetInfo.defaultValue);
}
return valueHolder;
}
/**
* Retrieve values from fields marked as reverse injectable of given instance.
*
* There are only limited scopes can be marked as injectable. See {@link Configuration#setReverseInjectableScopes(List)}.
*
* @param instance
* @throws DataOperationException
*/
public final static void setContextDataFromInstance(Object instance) throws DataOperationException {
try {
Context context = Context.getCurrentThreadContext();
InstanceWireTarget target = getInstanceTarget(instance);
Object value;
for (FieldInfo fi : target.getFieldList) {
value = FieldUtils.readField(fi.field, instance, true);
context.setData(fi.scope, fi.name, value);
}
for (MethodInfo mi : target.getMethodList) {
value = mi.method.invoke(instance);
context.setData(mi.scope, mi.name, value);
}
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
String msg = String.format("Exception when inject value from instance of [%s] to Context.", instance.getClass().toString());
throw new DataOperationException(msg, e);
}
}
private final static InstanceWireTarget getInstanceTarget(Object instance) throws DataOperationException {
boolean cacheEnable = Configuration.getConfiguration().isCacheEnable();
InstanceWireTarget target = null;
if (cacheEnable) {
String key = instance.getClass().getName();
target = InstanceTargetCache.get(key);
if (target == null) {
target = createInstanceTarget(instance);
InstanceTargetCache.put(key, target);
}
} else {
target = createInstanceTarget(instance);
}
return target;
}
private final static InstanceWireTarget createInstanceTarget(Object instance) throws DataOperationException {
InstanceWireTarget target = new InstanceWireTarget();
Class cls = instance.getClass();
List propertyList = AnnotatedPropertyUtil.retrieveProperties(cls);
try {
for (AnnotatedPropertyInfo prop : propertyList) {
ContextData cd = prop.getAnnotation(ContextData.class);
if (prop.getField() != null) {
Field field = prop.getField();
FieldInfo fi = new FieldInfo();
fi.propertyInfo = prop;
fi.name = prop.getName();
fi.field = field;
fi.type = field.getType();
fi.isContextDataHolder = ContextDataHolder.class.isAssignableFrom(fi.type);
fi.scope = cd.scope();
fi.typeUnMatch = cd.typeUnMatch();
fi.fixForPrimitiveType();
ContextDataSet cdSet = ConvertableAnnotationRetriever
.retrieveAnnotation(ContextDataSet.class, fi.type.getAnnotations());
if (cdSet == null) {
fi.contextDataSetFactory = null;
} else {
fi.contextDataSetFactory = cdSet.factory().newInstance();
fi.isContextDataSetSingletonInContext = cdSet.singletonInContext();
}
target.setFieldList.add(fi);
} else {// for method
MethodInfo mi = new MethodInfo();
mi.propertyInfo = prop;
mi.name = prop.getName();
mi.method = prop.getSetter();
if (mi.method == null) {
throw new DataOperationException("Could not find setter method for annotated property:" + prop.getName());
}
mi.type = mi.method.getParameterTypes()[0];
mi.isContextDataHolder = ContextDataHolder.class.isAssignableFrom(mi.type);
mi.scope = cd.scope();
mi.typeUnMatch = cd.typeUnMatch();
mi.fixForPrimitiveType();
ContextDataSet cdSet = ConvertableAnnotationRetriever
.retrieveAnnotation(ContextDataSet.class, mi.type.getAnnotations());
if (cdSet == null) {
mi.contextDataSetFactory = null;
} else {
mi.contextDataSetFactory = cdSet.factory().newInstance();
mi.isContextDataSetSingletonInContext = cdSet.singletonInContext();
}
target.setMethodList.add(mi);
}
}
} catch (InstantiationException | IllegalAccessException e) {
throw new DataOperationException("Exception occured on generating injection information of " + instance.getClass(), e);
}
return target;
}
/**
* Retrieve value from {@link Context} for given Method by configured {@link ContextDataFinder}
*
* @param method
* given method
* @return Retrieved values
* @throws DataOperationException
*/
public final static Object[] getMethodInjectParams(Method method) throws DataOperationException {
ContextDataFinder dataFinder = Configuration.getConfiguration().getContextDataFinder();
return getMethodInjectParams(method, dataFinder);
}
/**
* Retrieve value from {@link Context} for given Method by given {@link ContextDataFinder}
*
* @param method
* given method
* @param dataFinder
* given ContextDataFinder
* @return Retrieved values
* @throws DataOperationException
*/
public final static Object[] getMethodInjectParams(Method method, ContextDataFinder dataFinder) throws DataOperationException {
try {
List targetList = getMethodTarget(method);
Object[] params = new Object[targetList.size()];
if (params.length == 0) {
return params;
}
TargetInfo target;
ContextDataHolder valueHolder, foundData;
Class searchType;
for (int i = 0; i < params.length; i++) {
target = targetList.get(i);
valueHolder = target.createDataHolderInstance();
searchType = valueHolder.getTypeCls();
if (searchType == null) {
throw new DataOperationException(method.getName() + " cannot initialize an instance of " +
valueHolder.getClass().getName() + ". You should define an extended class to return the type class");
}
foundData = findValueForTarget(target, searchType);
handleTypeUnMatch(method, i, target, foundData);
if (target.isContextDataHolder) {
transferDataHolder(foundData, valueHolder);
params[i] = valueHolder;
} else {
params[i] = foundData.getValue();
}
}
return params;
} catch (InstantiationException | IllegalAccessException e) {
throw new DataOperationException("create instance failed.", e);
}
}
private final static List getMethodTarget(Method method) throws InstantiationException, IllegalAccessException {
boolean cacheEnable = Configuration.getConfiguration().isCacheEnable();
List targetList = null;
if (cacheEnable) {
targetList = MethodTargetCache.get(method);
if (targetList == null) {
targetList = createMethodTarget(method);
MethodTargetCache.put(method, targetList);
}
} else {
targetList = createMethodTarget(method);
}
return targetList;
}
private final static List createMethodTarget(Method method) throws InstantiationException, IllegalAccessException {
Class[] types = method.getParameterTypes();
List targetList = new ArrayList<>();
if (types.length == 0) {
return targetList;
}
Annotation[][] annotations = method.getParameterAnnotations();
String[] parameterNames = paranamer.lookupParameterNames(method);
TargetInfo target;
ContextData cd;
ContextDataSet cdSet;
for (int i = 0; i < types.length; i++) {
target = new TargetInfo();
target.type = types[i];
target.isContextDataHolder = ContextDataHolder.class.isAssignableFrom(target.type);
cd = ConvertableAnnotationRetriever.retrieveAnnotation(ContextData.class, annotations[i]);
cdSet = ConvertableAnnotationRetriever.retrieveAnnotation(ContextDataSet.class, target.type.getAnnotations());
target.name = cd == null ? "" : cd.name();
target.scope = cd == null ? "" : cd.scope();
target.typeUnMatch = cd == null ? TypeUnMacthPolicy.DEFAULT_VALUE : cd.typeUnMatch();
if (StringUtils.isEmpty(target.name)) {
target.name = parameterNames[i];
}
if (cdSet == null) {
target.contextDataSetFactory = null;
} else {
target.contextDataSetFactory = cdSet.factory().newInstance();
target.isContextDataSetSingletonInContext = cdSet.singletonInContext();
}
target.fixForPrimitiveType();
targetList.add(target);
}
return targetList;
}
public static final void initContext(Context context) {
context.setData(ContextDataSetSingletonMapKey, new HashMap());
}
}