/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.axis2.scripting;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import org.apache.bsf.BSFEngine;
import org.apache.bsf.BSFException;
import org.apache.bsf.BSFManager;
public class ScriptInvoker {
protected File scriptFile;
protected long lastModified;
protected long lastCheckTime;
protected int hotUpdateInterval;
protected BSFEngine engine;
private String scriptName;
public ScriptInvoker(File scriptFile, int hotUpdateInterval) {
this.scriptFile = scriptFile;
this.hotUpdateInterval = hotUpdateInterval;
this.scriptName = scriptFile.getName();
initEngine();
}
public Object invoke(String functionName, Object[] args) {
if (hotUpdateInterval > 0) {
checkUpdate();
}
try {
engine.call(null, functionName, args);
} catch (BSFException e) {
throw new RuntimeException(e);
}
return null;
}
protected synchronized void checkUpdate() {
long now = System.currentTimeMillis();
if (now - lastCheckTime > hotUpdateInterval) {
lastCheckTime = now;
long lm = scriptFile.lastModified();
if (lm != lastModified) {
lastModified = lm;
initEngine();
}
}
}
protected void initEngine() {
try {
String scriptLanguage = BSFManager.getLangFromFilename(scriptName);
BSFManager bsfManager = new BSFManager();
bsfManager.setClassLoader(BSFManager.class.getClassLoader());
// bsfManager.declareBean("_AxisService", axisService,
// AxisService.class);
BSFEngine bsfEngine = bsfManager
.loadScriptingEngine(scriptLanguage);
Object scriptSrc = readScript();
bsfEngine.exec(scriptName, 0, 0, scriptSrc);
} catch (BSFException e) {
throw new RuntimeException(e);
}
}
/**
* Reads the complete script source code into a String
*/
protected String readScript() {
Reader reader = null;
try {
reader = new FileReader(scriptFile);
char[] buffer = new char[1024];
StringBuffer source = new StringBuffer();
int count;
while ((count = reader.read(buffer)) > 0) {
source.append(buffer, 0, count);
}
return source.toString();
} catch (IOException e) {
throw new RuntimeException("IOException reading script: "
+ scriptName, e);
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
throw new RuntimeException("IOException closing script: "
+ scriptName, e);
}
}
}
}