package org.g4studio.core.id.storer;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.g4studio.core.id.SequenceStorer;
import org.g4studio.core.id.StoreSequenceException;
import org.g4studio.core.id.test.Hello;
/**
* FileSequenceStorer 此代码源于开源项目E3,原作者：黄云辉
*
* @author XiongChun
* @since 2010-03-17
* @see SequenceStorer
*/
public class FileSequenceStorer implements SequenceStorer {
private static final Log logger = LogFactory.getLog(FileSequenceStorer.class);
public static final String DEFAULT_FILE_PATH = "g4-id-sequence-store.properties";
/**
* 文件路径，包含文件名，
*/
private String filePath = DEFAULT_FILE_PATH;
protected String getRealFilePath() throws StoreSequenceException {
java.io.File tmp = new java.io.File(filePath);
if (tmp.exists()) {
return this.filePath;
}
URL url = Hello.class.getClassLoader().getResource(this.filePath);
if (url == null) {
final String msg = "存储sequence失败!没有发现文件：" + filePath;
logger.error(msg);
throw new StoreSequenceException(msg);
}
return url.getFile();
}
public long load(String sequenceID) throws StoreSequenceException {
java.util.Properties props = new java.util.Properties();
final String realFilePath = getRealFilePath();
if (logger.isDebugEnabled()) {
logger.debug("序号ID:[" + sequenceID + "]");
logger.debug("资源路径:[" + this.filePath + "]");
logger.debug("实际文件路径:[" + realFilePath + "]");
}
java.io.FileInputStream is = null;
try {
is = new java.io.FileInputStream(realFilePath);
props.load(is);
String result = props.getProperty(sequenceID);
if (result == null) {
return -1;
} else {
return Long.parseLong(result);
}
} catch (FileNotFoundException e) {
final String msg = "存储sequence失败!没有发现文件：" + realFilePath;
logger.error(msg, e);
throw new StoreSequenceException(msg, e);
} catch (IOException e) {
final String msg = "存储sequence失败!" + e.getMessage();
logger.error(msg, e);
throw new StoreSequenceException(msg, e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
final String msg = "关闭文件:" + realFilePath + "失败!" + e.getMessage();
logger.debug(msg, e);
}
}
}
}
public void updateMaxValueByFieldName(long sequence, String sequenceID) throws StoreSequenceException {
java.util.Properties props = new java.util.Properties();
final String realFilePath = getRealFilePath();
if (logger.isDebugEnabled()) {
logger.debug("序号ID:[" + sequenceID + "]");
logger.debug("资源路径:[" + this.filePath + "]");
logger.debug("实际文件路径:[" + realFilePath + "]");
}
java.io.FileInputStream is = null;
try {
is = new java.io.FileInputStream(realFilePath);
props.load(is);
props.setProperty(sequenceID, sequence + "");
} catch (FileNotFoundException e) {
final String msg = "存储sequence失败!没有发现文件：" + realFilePath;
logger.error(msg, e);
throw new StoreSequenceException(msg, e);
} catch (IOException e) {
final String msg = "存储sequence失败!" + e.getMessage();
logger.error(msg, e);
throw new StoreSequenceException(msg, e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
final String msg = "关闭文件:" + realFilePath + "失败!" + e.getMessage();
logger.debug(msg, e);
}
}
}
java.io.FileOutputStream out = null;
try {
out = new java.io.FileOutputStream(realFilePath);
props.store(out, "e3 id sequence storer, don't edit");
} catch (FileNotFoundException e) {
final String msg = "存储sequence失败!没有发现文件：" + realFilePath;
logger.error(msg, e);
throw new StoreSequenceException(msg, e);
} catch (IOException e) {
final String msg = "存储sequence失败!" + e.getMessage();
logger.error(msg, e);
throw new StoreSequenceException(msg, e);
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
final String msg = "关闭文件:" + realFilePath + "失败!" + e.getMessage();
logger.debug(msg, e);
}
}
}
}
public String getFilePath() {
return filePath;
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
}