/*
* Copyright (C) 2010-2101 Alibaba Group Holding Limited.
*
* 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.alibaba.otter.shared.common.utils.extension;
import org.apache.commons.lang.StringUtils;
import com.alibaba.otter.shared.common.model.config.data.ExtensionData;
import com.alibaba.otter.shared.common.utils.cache.ExtensionMemoryMirror;
import com.alibaba.otter.shared.common.utils.cache.ExtensionMemoryMirror.ComputeFunction;
import com.alibaba.otter.shared.common.utils.compile.impl.JdkCompiler;
import com.alibaba.otter.shared.common.utils.compile.model.JavaSource;
import com.alibaba.otter.shared.common.utils.extension.classpath.ClassScanner;
import com.alibaba.otter.shared.common.utils.extension.exceptions.ExtensionLoadException;
/**
* @author jianghang 2012-11-7 下午02:11:46
* @version 4.1.2
*/
public class DefaultExtensionFactory implements ExtensionFactory {
private ExtensionMemoryMirror<ExtensionData, Object> resolverCache;
private ClassScanner classPathScanner;
private ClassScanner fileSystemScanner;
private JdkCompiler jdkCompiler;
public DefaultExtensionFactory(){
resolverCache = new ExtensionMemoryMirror<ExtensionData, Object>(new ComputeFunction<ExtensionData, Object>() {
public Object apply(ExtensionData extensionData) {
return getExtensionInternal(extensionData);
}
});
}
public <T> T getExtension(Class<T> type, ExtensionData extensionData) {
return (T) resolverCache.get(extensionData);
}
private Object getExtensionInternal(ExtensionData extensionData) {
Class<?> clazz = null;
String fullname = StringUtils.EMPTY;
if (extensionData.getExtensionDataType().isClazz() && StringUtils.isNotBlank(extensionData.getClazzPath())) {
clazz = scan(extensionData.getClazzPath());
fullname = "[" + extensionData.getClazzPath() + "]ClassPath";
} else if (extensionData.getExtensionDataType().isSource()
&& StringUtils.isNotBlank(extensionData.getSourceText())) {
JavaSource javaSource = new JavaSource(extensionData.getSourceText());
clazz = jdkCompiler.compile(javaSource);
fullname = "[" + javaSource.toString() + "]SourceText";
}
if (clazz == null) {
throw new ExtensionLoadException("ERROR ## classload this fileresolver=" + fullname + " has an error");
}
try {
return clazz.newInstance();
} catch (Exception e) {
throw new ExtensionLoadException("ERROR ## classload this fileresolver=" + fullname + " has an error", e);
}
}
private Class scan(String fileResolverClassname) {
Class<?> clazz = classPathScanner.scan(fileResolverClassname);
if (clazz == null) {
clazz = fileSystemScanner.scan(fileResolverClassname);
}
return clazz;
}
// =============setter / getter===============
public void setClassPathScanner(ClassScanner classPathScanner) {
this.classPathScanner = classPathScanner;
}
public void setFileSystemScanner(ClassScanner fileSystemScanner) {
this.fileSystemScanner = fileSystemScanner;
}
public ClassScanner getFileSystemScanner() {
return fileSystemScanner;
}
public void setJdkCompiler(JdkCompiler jdkCompiler) {
this.jdkCompiler = jdkCompiler;
}
}