Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/**
* Copyright (C) 2000-2010 Atomikos
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* 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.
*/
package com.atomikos.persistence.imp;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.io.StreamCorruptedException;
import java.util.Enumeration;
import java.util.Vector;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.persistence.LogException;
import com.atomikos.persistence.LogStream;
import com.atomikos.persistence.Recoverable;
/**
* A file implementation of a LogStream.
*/
public class FileLogStream extends AbstractLogStream implements LogStream {
private static final Logger LOGGER = LoggerFactory.createLogger(FileLogStream.class);
// keeps track of the latest output stream returned
// from writeCheckpoint, so that it can be closed ( invalidated )
// if necessary.
private ObjectOutputStream ooutput_;
private boolean corrupt_;
// true if error on checkpoint; second call of recover
// not allowed, otherwise suffix_ will be wrong
// especially since checkpoint failed.
public FileLogStream(String baseDir, String baseName) throws IOException {
super(baseDir, baseName);
}
void markAsCorrupt() {
corrupt_ = true;
}
public synchronized Vector recover() throws LogException {
if (corrupt_)
throw new LogException("Instance might be corrupted");
Vector ret = new Vector();
InputStream in = null;
try {
FileInputStream f = file_.openLastValidVersionForReading();
in = f;
ObjectInputStream ins = new ObjectInputStream(in);
int count = 0;
if (LOGGER.isInfoEnabled()) {
LOGGER.logInfo("Starting read of logfile " + file_.getCurrentVersionFileName());
}
while (in.available() > 0) {
// if crashed, then unproper closing might cause endless blocking!
// therefore, we check if avaible first.
count++;
Recoverable nxt = (Recoverable) ins.readObject();
ret.addElement(nxt);
if (count % 10 == 0) {
LOGGER.logInfo(".");
}
}
LOGGER.logInfo("Done read of logfile");
} catch (java.io.EOFException unexpectedEOF) {
LOGGER.logDebug("Unexpected EOF - logfile not closed properly last time?", unexpectedEOF);
// merely return what was read so far...
} catch (StreamCorruptedException unexpectedEOF) {
LOGGER.logDebug("Unexpected EOF - logfile not closed properly last time?", unexpectedEOF);
// merely return what was read so far...
} catch (ObjectStreamException unexpectedEOF) {
LOGGER.logDebug("Unexpected EOF - logfile not closed properly last time?", unexpectedEOF);
// merely return what was read so far...
} catch (FileNotFoundException firstStart) {
// the file could not be opened for reading;
// merely return the default empty vector
} catch (Exception e) {
String msg = "Error in recover";
LOGGER.logWarning(msg, e);
throw new LogException(msg, e);
} finally {
try {
if (in != null)
in.close();
} catch (IOException io) {
throw new LogException("Error in recover", io);
}
}
return ret;
}
public synchronized void writeCheckpoint(Enumeration elements) throws LogException {
// first, make sure that any pending output stream handles
// in the client are invalidated
closeOutput();
try {
// open the new output file
// NOTE: after restart, any previous and failed checkpoint files
// will be overwritten here. That is perfectly OK.
output_ = file_.openNewVersionForWriting();
ooutput_ = new ObjectOutputStream(new BufferedOutputStream(output_,4096));
while (elements != null && elements.hasMoreElements()) {
Object next = elements.nextElement();
ooutput_.writeObject(next);
}
ooutput_.flush();
output_.flush();
output_.getFD().sync();
// NOTE: we do NOT close the object output, since the client
// will probably want to write more!
// Thus, we return the open stream to the client.
// Any closing will be done later, during cleanup if necessary.
if (corrupt_) {
throw new LogException("Instance corrupted");
}
try {
file_.discardBackupVersion();
} catch (IOException errorOnDelete) {
markAsCorrupt();
// should restart
throw new LogException("Old file could not be deleted");
}
} catch (Exception e) {
throw new LogException("Error during checkpointing", e);
}
}
public synchronized void flushObject(Object o, boolean shouldSync) throws LogException {
if (ooutput_ == null)
throw new LogException("Not Initialized or already closed");
try {
ooutput_.writeObject(o);
output_.flush();
ooutput_.flush();
if (shouldSync)
output_.getFD().sync();
} catch (IOException e) {
throw new LogException(e.getMessage(), e);
}
}
}
