/*
* #%L
* P6Spy
* %%
* Copyright (C) 2013 P6Spy
* %%
* 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.
* #L%
*/
package com.p6spy.engine.spy.option;
import com.p6spy.engine.common.P6Util;
import com.p6spy.engine.spy.P6ModuleManager;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.Properties;
public class SpyDotProperties implements P6OptionsSource {
public static final String OPTIONS_FILE_PROPERTY = "spy.properties";
public static final String DEFAULT_OPTIONS_FILE = OPTIONS_FILE_PROPERTY;
private final long lastModified;
private SpyDotPropertiesReloader reloader;
private final Map<String, String> options;
/**
* Creates a new instance and loads the properties file if found.
*
* @throws IOException
*/
public SpyDotProperties() throws IOException {
URL url = locate();
if (null == url) {
// no config file preset => skip props loading
lastModified = -1;
options = null;
return;
}
lastModified = lastModified();
InputStream in = null;
try {
in = url.openStream();
final Properties properties = new Properties();
properties.load(in);
options = P6Util.getPropertiesMap(properties);
} finally {
if (null != in) {
try {
in.close();
} catch( Exception e ) {
}
}
}
}
/**
* Determines if the file has been modified since it was loaded
*
* @return true if modified, false otherwise
*/
public boolean isModified() {
return lastModified() != lastModified;
}
private long lastModified() {
long lastMod = -1;
URLConnection con = null;
URL url = locate();
if( url != null ) {
try {
con = url.openConnection();
lastMod = con.getLastModified();
} catch (IOException e) {
// ignore
} finally {
if( con != null ) {
// getLastModified opens an input stream if it is a file
// the inputStream must be closed manually!
InputStream in = null;
try {
in = con.getInputStream();
} catch (IOException e) {
}
if( in != null ) {
try {
in.close();
} catch (IOException e) {}
}
}
}
}
return lastMod;
}
private URL locate() {
String propsFileName = System.getProperty(OPTIONS_FILE_PROPERTY, DEFAULT_OPTIONS_FILE);
if (null == propsFileName || propsFileName.isEmpty()) {
propsFileName = DEFAULT_OPTIONS_FILE;
}
return P6Util.locateFile(propsFileName);
}
@Override
public Map<String, String> getOptions() {
return options;
}
@Override
public void preDestroy(P6ModuleManager p6moduleManager) {
if (reloader != null) {
reloader.kill(p6moduleManager);
}
}
@Override
public void postInit(P6ModuleManager p6moduleManager) {
reloader = new SpyDotPropertiesReloader(this, p6moduleManager);
}
}