org.objectweb.howl.log.xa.XALogger Maven / Gradle / Ivy
/*
* JOnAS: Java(TM) Open Application Server
* Copyright (C) 2004 Bull S.A.
* All rights reserved.
*
* Contact: [email protected]
*
* This software is licensed under the BSD license.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ------------------------------------------------------------------------------
* $Id: XALogger.java,v 1.19 2005/11/16 23:09:59 girouxm Exp $
* ------------------------------------------------------------------------------
*/
package org.objectweb.howl.log.xa;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import org.objectweb.howl.log.Configuration;
import org.objectweb.howl.log.InvalidFileSetException;
import org.objectweb.howl.log.InvalidLogBufferException;
import org.objectweb.howl.log.InvalidLogKeyException;
import org.objectweb.howl.log.LogClosedException;
import org.objectweb.howl.log.LogConfigurationException;
import org.objectweb.howl.log.LogException;
import org.objectweb.howl.log.LogFileOverflowException;
import org.objectweb.howl.log.LogRecord;
import org.objectweb.howl.log.LogRecordSizeException;
import org.objectweb.howl.log.LogRecordType;
import org.objectweb.howl.log.Logger;
import org.objectweb.howl.log.LogEventListener;
import org.objectweb.howl.log.ReplayListener;
/**
* A specialized subclass of {@link org.objectweb.howl.log.Logger}
* intended to provide functionality required by any XA Transaction Manager.
*
* This class provides wrappers for all public methods of Logger
* to allow enforcement of policies that are in place for an XA TM log.
*
*
This class implements {@link org.objectweb.howl.log.LogEventListener}.
* During logOverflowNotification processing, entries in the activeTx[]
* are re-logged and the active mark is moved.
*
*
If the application has called setLogEventListener, then
* Log events are forwarded to the application after they are
* processed by this class.
*
* @author Michael Giroux
*
*/
/*
* @history
*
* 2004-09-01 FEATURE 300768
* open(ReplayListener) accepts null
* OpenReplayListener constructor accepts null
* replayActiveTx(ReplayListener) method added
*
*/
public class XALogger extends Logger
implements LogEventListener
{
/**
* array of transactions in COMMIT phase and
* waiting for DONE.
* Array is grown as needed to accomodate
* larger number of transactions in COMMITING state.
*
When the Logger detects that a log file overflow
* condition is about to occur
* {@link org.objectweb.howl.log.LogEventListener#logOverflowNotification(long)}
* is invoked to allow the application to move older records
* forward in the log. This approach avoides the need to
* move records forward every time a log file switch occurs.
*
During the logOverflowNotification, activeTx[] is scanned
* for entries with log keys older than the key specified
* on the notification. Since this processing only needs to
* occur when a log file is about to overflow, the array is
* used as an alternative to a linked list to eliminate the
* overhead of managing the linked list for every
* log record.
*/
XACommittingTx[] activeTx = null;
/**
* array of available XACommittingTx objects.
*
Each entry in the array is associated with
* an entry in activeTx[].
*
* - Entries are obtained using the atxGet member.
* - Entries are returned to the list using the atxPut member.
* - The activeTx and availableTx arrays are grown as needed.
*
*/
XACommittingTx[] availableTx = null;
/**
* workerID into availableTx[] used to remove an
* entry.
*/
int atxGet = 0;
/**
* workerID into availableTx[] used to return (add)
* an entry.
*/
int atxPut = 0;
/**
* number of used entries in activeTx table.
* table is grown when atxUsed is
* equal to the size of the table and we are
* trying to add one more entry.
*/
int atxUsed = 0;
/**
* maximum number of used entries.
*/
int maxAtxUsed = 0;
/**
* lock used to synchronize access to the
* availableTx array, atxGet and atxPut
* members.
*/
final Object activeTxLock = new Object();
/**
* number of times the activeTx table was resized
* to accomodate a larger number of transactions
* in the COMMITTING state.
*/
int growActiveTxArrayCount = 0;
/**
* number of times log overflow notification event was called.
*/
int overflowNotificationCount = 0;
/**
* number of records moved by log overflow notification processor.
*/
int movedRecordCount = 0;
/**
* number of ms that threads waited for overflow processing to complete.
*/
long totalWaitForThis = 0L;
/**
* number of times threads waited for overflow processing to complete.
*/
int waitForThisCount = 0;
/**
* log key below which COMMIT records will be copied forward
* by logOverflowNotification to avoid log overflow exceptions.
*
*
synchronized on this
*/
long overflowFence = 0L;
/**
* LogEventListener registered by TM that instantiated
* this XALogger.
*
*
XALogger may pass some notifications on to the
* TM via this.eventListener.
*/
LogEventListener eventListener = null;
/**
* Set true in open() to indicate that
* replay is required prior to allowing any
* calls to put() methods.
*
*
Calls to any put() method while
* replayNeeded is true will cause
* an exception to be thrown.
*/
boolean replayNeeded = true;
/**
* Resize the activeTx and availableTx tables
* to accomodate larger number of transactions
* in the COMMITTING state.
*
*
PRECONDITION: thread has activeTxLock shut
*/
private void growActiveTxArray()
{
// allocate new arrays
XACommittingTx[] newActiveTx = new XACommittingTx[activeTx.length + 50];
XACommittingTx[] newAvailableTx = new XACommittingTx[newActiveTx.length];
// initialize new elements
for (int i = activeTx.length; i < newActiveTx.length; ++ i)
{
newActiveTx[i] = null;
newAvailableTx[i] = new XACommittingTx(i);
}
// calling thread already holds the lock, so this is really not necessary
synchronized(activeTxLock)
{
// copy existing entries to new tables
for (int i = 0; i < activeTx.length; ++ i)
{
newActiveTx[i] = activeTx[i];
newAvailableTx[i] = availableTx[i];
}
// update pointers
atxPut = 0;
atxGet = activeTx.length;
// activate the new tables
activeTx = newActiveTx;
availableTx = newAvailableTx;
}
++growActiveTxArrayCount;
}
/**
* Common initialization for all constructors.
*/
private void init()
{
// allocate a table of active transaction objects
activeTx = new XACommittingTx[50];
for (int i=0; i < activeTx.length; ++i)
activeTx[i] = null;
// allocate and initialize the table of indexes
// for available entries in activeTx.
// initially, all entries are available.
availableTx = new XACommittingTx[activeTx.length];
for (int i=0; i < activeTx.length; ++i)
availableTx[i] = new XACommittingTx(i);
// register the event listener
super.setLogEventListener(this);
}
/**
* Construct a Logger using default Configuration object.
* @throws IOException
*/
public XALogger()
throws IOException
{
super(new Configuration());
init();
}
/**
* Construct a Logger using a Configuration supplied
* by the caller.
* @param config Configuration object
* @throws IOException
*/
public XALogger(Configuration config)
throws IOException
{
super(config);
init();
}
private void checkPutEnabled()
throws LogClosedException
{
if (replayNeeded)
throw new LogClosedException("replay() must be called prior to put(); activeMark [0x" +
Long.toHexString(super.getActiveMark()) + "]");
}
/**
* add a USER record consisting of byte[] to the log.
*
waits for overflow notification processing to complete
* prior to putting the data to the log.
*
* @throws LogClosedException
* If the TM has called open() but has not called replay().
* Also thrown if log is actually closed.
* Check the toString() for details.
*
* @see org.objectweb.howl.log.Logger#put(byte[], boolean)
*/
public long put(byte[] data, boolean sync)
throws LogClosedException, LogRecordSizeException, LogFileOverflowException,
InterruptedException, IOException
{
checkPutEnabled();
// wait for overflow notification processor to finish.
onpWait();
return put(LogRecordType.USER, new byte[][]{data}, sync);
}
/**
* add a USER record consisting of byte[][] to the log.
*
waits for overflow notification processing to complete
* prior to putting the data to the log.
*
* @throws LogClosedException
* If the TM has called open() but has not called replay().
* Also thrown if log is actually closed.
* Check the toString() for details.
*
* @see org.objectweb.howl.log.Logger#put(byte[][], boolean)
*/
public long put(byte[][] data, boolean sync)
throws LogClosedException, LogRecordSizeException, LogFileOverflowException,
InterruptedException, IOException
{
checkPutEnabled();
// wait for overflow notification processor to finish.
onpWait();
return put(LogRecordType.USER, data, sync);
}
/**
* wait for overflow notification processor to finish.
*
*
failure to do might cause the overflow processor itself to
* get LogFileOverflowException.
*
* @throws InterruptedException
*/
private void onpWait()
throws InterruptedException
{
long beginWait = System.currentTimeMillis();
synchronized(this)
{
if (this.overflowFence != 0L)
++waitForThisCount;
while (this.overflowFence != 0L)
wait();
totalWaitForThis += (System.currentTimeMillis() - beginWait);
}
}
/**
* Write a begin COMMIT record to the log.
*
Call blocks until the data is forced to disk.
*
* @param record byte[][] containing data to be logged
*
* @return XACommittingTx object to be used whe putting the DONE record.
*
* @throws LogClosedException
* If the TM has called open() but has not called replay().
* Also thrown if log is actually closed.
* Check the toString() for details.
*
* @throws IOException
* @throws InterruptedException
* @throws LogFileOverflowException
* @throws LogRecordSizeException
*/
public XACommittingTx putCommit(byte[][] record)
throws LogClosedException, LogRecordSizeException, LogFileOverflowException, InterruptedException, IOException
{
long key = 0L;
long overflowFence = 0L;
checkPutEnabled();
// wait for overflow notification processor to finish.
onpWait();
/*
* The following loop handles the (hopefully very rare) case
* where the call to put() returns a key that is lower than
* the current overflowFence. This should not happen, but
* just in case we have a situation in which a thread is not
* dispatched for a very long time after the record is
* written to the log file, it is theoretically possible that
* the log key returned by put() could be lower than the
* overflowFence. If this happens, we just rewrite the
* record.
*
* Note: A very obnoxious test case using extremely small files
* might actually put this into an infinate loop.
*/
do
{
key = put(LogRecordType.XACOMMIT, record, true);
synchronized(this) { overflowFence = this.overflowFence; }
} while (key < overflowFence);
return activeTxAdd(key, record);
}
/**
* Used by putCommit() and by OpenReplayListener#onRecord()
* to add entries to the activeTx table.
*
* @param key log key for the XACOMMIT record
* @param record byte[][] of record data
*
* @return XACommitting object representing the XACOMMIT
* data record in the log.
*/
private XACommittingTx activeTxAdd(long key, byte[][] record)
{
XACommittingTx tx = null;
synchronized(activeTxLock)
{
// resize activeTx[] if necessary
if (atxUsed == activeTx.length)
growActiveTxArray();
// get an available entry workerID and save reference
tx = availableTx[atxGet];
assert tx != null : "availableTx[" + atxGet +"] is null";
availableTx[atxGet] = null;
atxGet = (atxGet + 1) % activeTx.length;
/*
* update XACommittingTx with values for this COMMIT
*
* DEBUG NOTE: to test tx for null, we could put a
* breakpoint on any of the following statements and
* set a breakpoint condition for tx == null. However, this uses
* a lot of CPU time and makes the debug session run
* very slow. It seems to be faster to wrap the code
* it a try/catch and set a breakpoint in the catch.
*/
try {
tx.setLogKey(key);
tx.setRecord(record);
tx.setDone(false);
tx.setMoving(false);
} catch (NullPointerException npe) {
throw npe;
}
int index = tx.getIndex();
activeTx[index] = tx;
// maintain statistics
++atxUsed;
maxAtxUsed = Math.max(atxUsed, maxAtxUsed);
}
return tx;
}
/**
* Write a DONE record to the log.
*
Remove XACommittingTx object from the list of
* active transactions.
*
* @param record byte[][] containing data to be logged.
*
If record is null then
* no user data is written to the journal.
* @param tx the XACommittingTx that was returned
* by the putCommit() routine for this transaction.
*
* @return long log key for the record byte[][].
*
If record is null, then return is 0L.
*
* @throws IOException
* @throws InterruptedException
* @throws LogFileOverflowException
* @throws LogRecordSizeException
*
* @throws LogClosedException
* If the TM has called open() but has not called replay().
* Also thrown if log is actually closed.
* Check the toString() for details.
*
*
*/
public long putDone(byte[][] record, XACommittingTx tx)
throws LogClosedException, LogRecordSizeException, LogFileOverflowException,
InterruptedException, IOException
{
checkPutEnabled();
assert tx != null : "XACommitingTX is null";
// remove this entry from the activeTx table so overflow processor does not see it
synchronized(activeTxLock)
{
int index = tx.getIndex();
if (activeTx[index] != tx) throw new IllegalArgumentException();
activeTx[index] = null;
}
// mark entry as DONE and wait (if necessary) for move to complete
synchronized(tx)
{
// let logOverflowNotification know that this entry does not have to be moved
tx.setDone(true);
// in case logOverflowNotification got into the object first
while (tx.isMoving())
tx.wait();
}
long doneKey = 0L;
if (record != null)
{
// write the DONE record
do {
try {
doneKey = put(LogRecordType.USER, record, false);
} catch (LogFileOverflowException e) {
Thread.sleep(10);
}
} while (doneKey == 0L);
}
// record the XADONE record with logKey from XACOMMIT record
long xadoneKey = 0L;
do {
try {
xadoneKey = put(LogRecordType.XADONE, tx.logKeyData, false);
} catch (LogFileOverflowException e) {
Thread.sleep(10);
}
} while (xadoneKey == 0L);
// make entry available for re-use.
synchronized(activeTxLock)
{
tx.setLogKey(0); // prevent duplicate entries in log BUG: 303907
availableTx[atxPut] = tx;
atxPut = (atxPut + 1) % activeTx.length;
--atxUsed;
assert atxUsed >= 0 : "Negative atxUsed (" + atxUsed + ")";
}
return doneKey;
}
/**
* implements LogEventListener#isLoggable().
* @param level a logging level defined by LogEventListener
*/
public boolean isLoggable(int level)
{
boolean loggable = false; // cannot log events if caller did not provide a listener
if (this.eventListener != null)
loggable = eventListener.isLoggable(level);
return loggable;
}
/**
* delegates log request to the callers event listener.
* @param level log level
* @param message text to be logged
*/
public void log(int level, String message)
{
if (this.eventListener != null)
eventListener.log(level, message);
}
/**
* delegates log request to the callers event listener.
* @param level log level
* @param message text to be logged
* @param thrown Throwable related to event being logged
*/
public void log(int level, String message, Throwable thrown)
{
if (this.eventListener != null)
eventListener.log(level, message, thrown);
}
/**
* called by Logger when log file is about to overflow.
*
* copies XACommittingTx records forward to allow reuse
* of older log file space.
*
*
calls Logger.mark() to set the new active mark
* at the completion of the scan.
*
*
Exceptions are ignored. Hopefully they will be
* reported to the TM when a transaction thread attempts
* to write a log record.
*
*
While we are processing activeTx[] we publish
* the overflowFence so putCommit knows that any record
* it stores with a key below the fence must be re-put.
*
*
This notification is not forwarded to the LogEventListener
* eventListener that was registered by the TM.
*
* @param overflowFence COMMIT records with
* log keys lower than fence must
* be moved. All others can be ignored
* for now.
*/
public void logOverflowNotification(long overflowFence)
{
boolean logClosed = false; // BUG 300799
long newMark = Long.MAX_VALUE;
XACommittingTx tx = null;
long txKey = 0L;
if (overflowFence == 0) throw new IllegalArgumentException("overflowFence == 0");
// increment number of times we are notified
++overflowNotificationCount;
synchronized(this)
{
// putCommit will re-put a record if it is below the fence
this.overflowFence = overflowFence;
}
// allow application to process this event
if (eventListener != null)
eventListener.logOverflowNotification(overflowFence);
/*
* walk through the activeTx table and move any
* records that are below the overflowFence.
*/
for (int i=0; i < activeTx.length; ++i)
{
synchronized(activeTxLock)
{
tx = activeTx[i];
if (tx == null) continue;
}
synchronized(tx)
{
// gaurd against the possibility that putDone got into the object first
if (tx.isDone()) continue;
txKey = tx.getLogKey();
if (txKey > overflowFence)
{
// we are not moving this entry, but it might be the new active mark
if (txKey < newMark)
newMark = txKey; // remember the oldest active transaction
continue;
}
// make putDone wait till we get this record moved
tx.setMoving(true);
}
try {
// get reference to original record
byte[][] record = tx.getRecord();
// construct an XACOMMITMOVED record
// with room for original log key.
//
// original log key is used during replay to locate and
// update the activeTx table that is maintained by this XALogger.
//
// NOTE: inserted key must be removed during replay
// before returning record to TM.
byte[][] movedRecord = new byte[record.length + 1][];
movedRecord[0] = tx.logKeyData[0];
System.arraycopy(record, 0, movedRecord, 1, record.length);
// move the COMMIT record data
// we force all the moved records later when we set the new mark.
// NOTE: be careful not to use the put() methods that will
// cause this thread to wait in onpWait().
txKey = put(LogRecordType.XACOMMITMOVED, movedRecord, false);
// keep track of the number of records moved.
++movedRecordCount;
synchronized(tx)
{
tx.setLogKey(txKey);
tx.setMoving(false);
tx.notifyAll(); // in case putDone is waiting
}
} catch (LogClosedException e1) {
// We can safely ignore the exception.
// Restart may see moved records multiple times, but this is not a problem.
logClosed = true; // BUG 300799
break; // BUG 300799 - remove assert
} catch (LogRecordSizeException e1) { // ignore
assert false : "unexpected LogRecordSizeException";
} catch (LogFileOverflowException e1) { // ignore
assert false : "unexpected LogFileOverflowException";
} catch (InterruptedException e1) { // ignore
} catch (IOException e1) { // ignore
}
}
// set new mark using oldest log key encountered during scan of activeTx[]
try {
// if we have not moved any records, set new mark at the beginning of next file.
if (newMark == Long.MAX_VALUE)
newMark = overflowFence;
// BUG 300799 if we got a LogClosedException while moving records
// then we cannot update the mark.
if (!logClosed)
mark(newMark, true); // force = true
} catch (InvalidLogKeyException e) { // should never happen
System.err.println(e.toString());
Thread.yield();
} catch (LogClosedException e) { // should never happen
assert false : "Log closed during logOverflowNotification processing";
} catch (IOException e) {
// ignore here - it will get caught by a transaction thread
} catch (InterruptedException e) {
// ignore here - it will get caught by a transaction thread
}
// let putCommit know that overflow processing is idle
synchronized(this)
{
this.overflowFence = 0L;
notifyAll();
}
}
/**
* return an XML node containing statistics for
* this object along with the base Logger,
* the LogFile pool and the LogBuffer pool.
*
* @return String contiining XML document.
*/
public String getStats()
{
String name = this.getClass().getName();
StringBuffer stats = new StringBuffer(
"\n"
);
stats.append(
"\nNumber of times activeTx table was resized to accomodate " +
"a larger number of transactions in COMMITTING state" +
" " +
"\nMaximum number of active TX entries used" +
" " +
"\nNumber of records moved during log overflow notification processing" +
" " +
"\nnumber of times log overflow notification event was called." +
" " +
"\nNumber of times threads waited for overflow processing to complete" +
" " +
"\nTotal time (ms) threads waited for overflow processing to complete" +
" "
);
stats.append(super.getStats());
stats.append("\n " +
"\n");
return stats.toString();
}
/**
* Provide synchronized access to waitForThisCount.
* @return waitForThisCount
*/
private final synchronized int getWaitForThisCount()
{
return waitForThisCount;
}
/**
* Provide synchronized access to totalWaitForThis.
* @return totalWaitForThis
*/
private final synchronized long getTotalWaitForThis()
{
return totalWaitForThis;
}
/**
* Saves a reference to callers LogEventListener.
*
*
Some LogEventListener notifications may be
* passed onto the callers eventListener.
* Refer to javadocs in this source
* for individual notifications to determine if
* the notification is passed on to the TM.
*
* @param eventListener object to be notified of logger events.
*/
public void setLogEventListener(LogEventListener eventListener)
{
this.eventListener = eventListener;
}
/**
* Not supported for XALogger.
*
XALogger must rebuild the activeTx table prior to allowing
* any calls to put() methods. To enforce this, callers must
* use the {@link #open(ReplayListener)} method.
*
* @throws UnsupportedOperationException
*/
public void open()
{
throw new UnsupportedOperationException("Use open(ReplayListener) instead");
}
/**
* calls super.open() to perform standard open functionality then
* replays the log to rebuild the activeTx table.
*
*
Sets replayNeeded flag to block calls to put() methods
* until the replay is complete. (This may be unnecessary because
* the replay blocks until it is complete, but we do this to
* prevent the TM from trying to make log entries on another
* thread before the log is fully open.)
*
*
During the replay, the XALogger calls the TM's
* listener.onRecord() with an XALogRecord object.
* The TM is expected to call getTx() to obtain
* a reference to the XACommittingTx that will be
* used to complete the transaction usin putDone()
* later.
*
*
Note that XALogger does not call the TM's
* listener.getLogRecord().
*
* @param listener
* The TM can receive replay events by
* providing a ReplayListener.
* TMs that do not wish to see all records during
* the open replay should pass a null ReplayListener.
* @see #replayActiveTx(ReplayListener)
*/
public void open(ReplayListener listener)
throws InvalidFileSetException, LogConfigurationException,
InvalidLogBufferException, LogClosedException,
ClassNotFoundException, IOException, InterruptedException
{
this.replayNeeded = true; // block put() methods until replay completes
super.open();
OpenReplayListener xaListener = new OpenReplayListener(listener);
try {
super.replay(xaListener, getActiveMark(), true); // replay CTRL records also
} catch (InvalidLogKeyException e) {
throw new LogClosedException(e);
}
// something very wrong if we come back from replay and we have not cleared the flag.
if (replayNeeded)
{
LogClosedException lce = new LogClosedException(xaListener.replayException);
throw lce;
}
}
public void close() throws IOException, InterruptedException
{
if (isClosed) return;
long newMark = Long.MAX_VALUE;
XACommittingTx tx = null;
// set new log mark at oldest activeTx entry
synchronized(activeTxLock)
{
for (int i=0; i < activeTx.length; ++i)
{
tx = activeTx[i];
if (tx == null) continue;
long key = tx.getLogKey();
if (key < newMark) newMark = key;
}
if (newMark < Long.MAX_VALUE)
{
try {
this.mark(newMark, true);
} catch (InvalidLogKeyException e) {
// will not happen
} catch (LogClosedException e) {
// will not happen
}
}
}
super.close();
}
/**
* Used by TM and test cases to obtain the
* number of entries in the activeTx table.
*
TIP: if value does not agree with expected
* value in TM or test case, we probably have
* a bug somewhere.
*
* @return current number of used entries in activeTx table
*/
public int getActiveTxUsed()
{
return this.atxUsed;
}
/**
* displays entries in the activeTx table.
*
useful for debug.
*/
public void activeTxDisplay()
{
for (int i=0; i < activeTx.length; ++i)
{
if (activeTx[i] == null) continue;
synchronized(activeTx)
{
XACommittingTx tx = activeTx[i];
byte[][] record = tx.getRecord();
System.out.println("activeTx[" + i + "] key=" + Long.toHexString(tx.getLogKey()) +
"\n Fields: " + record.length
);
for (int j = 0; j < record.length; ++j)
{
byte[] field = record[j];
System.out.println(" [" + j + "] len=" + field.length + ": " + new String(field));
}
}
}
}
/**
* Wrapp Logger#replay(ReplayListener) so we can
* intercept onRecord() notifications to process
* XACOMMIT and XACOMMITMOVED records.
*/
public void replay(ReplayListener listener)
throws LogConfigurationException
{
try {
this.replay(listener, getActiveMark());
} catch (InvalidLogKeyException e) {
// should not happen
assert false : "Unhandled InvalidLogKeyException" + e.toString();
}
}
/**
* Wrapp Logger#replay(ReplayListener, long) so we can
* intercept onRecord() notifications to process
* XACOMMIT and XACOMMITMOVED records.
*/
public void replay(ReplayListener listener, long key)
throws InvalidLogKeyException, LogConfigurationException
{
XAReplayListener replayListener = new XAReplayListener(listener);
super.replay(replayListener, key, true);
}
/**
* Called by the TM to receive copies of the
* active transaction entries.
*
*
TMs can use this method as an alternative
* to passing a ReplayListener to open. The
* advantage is that only active transaction
* entries are returned to the ReplayListener.onRecord()
* method.
*
* @param listener The activeTx entries are passed
* to the TM through this ReplayListener.
*/
public void replayActiveTx(ReplayListener listener)
{
XACommittingTx tx = null;
XALogRecord lr = null;
// scan activeTx[] for non-null entries
for (int i=0; i < activeTx.length; ++i)
{
tx = activeTx[i];
if (tx == null) continue;
// found an active entry -- rebuild the XALogRecord entries
byte[][] record = tx.getRecord();
short recordSize = 0;
for(int j=0; j < record.length; ++j)
{
// calculate size of byte[] needed for current entry
recordSize += (2 + record[j].length);
}
lr = new XALogRecord(recordSize);
// populate the LogRecord
lr.length = recordSize;
lr.dataBuffer.clear();
for (int j=0; j < record.length; ++j)
{
lr.dataBuffer.putShort((short)record[j].length);
lr.dataBuffer.put(record[j]);
}
lr.key = tx.getLogKey();
lr.tod = 0L;
lr.setTx(tx);
lr.type = LogRecordType.XACOMMIT;
// give the LogRecord to TM for processing
listener.onRecord(lr);
}
// signal end of table
lr = new XALogRecord(0);
lr.type = LogRecordType.END_OF_LOG;
listener.onRecord(lr);
}
/**
* private class used by XALogger to replay the log during
* log open processing.
*
*
As log records are replayed through onRecord method,
* the HashMap activeTxHashMap is updated. XACOMMIT type
* records are added to the activeTxHashMap, and XADONE type records
* remove an entry.
*
*
When the END_OF_LOG record is encountered, the
* activeTx table is up to date and ready for
* new entries to be added by the TM.
*
* @author Michael Giroux
*/
private class OpenReplayListener implements ReplayListener
{
LogRecord lr = new XALogRecord(80);
final XALogger parent = XALogger.this;
// set by onError()
LogException replayException = null;
/**
* ReplayListener registered by TM that instantiated
* this XALogger.
*
*
During replay, non-CTRL records are returned
* to the TM's replayListener.
*/
final ReplayListener tmListener;
/**
* Used to keep track of XACOMMIT records encountered
* during replay. An entry is added to the activeTxHashMap when
* XACOMMIT type record is replayed, and removed
* when XADONE type record is replayed.
*/
final HashMap activeTxHashMap;
// counters that might be interesting to a test case
public int unmatchedDoneCount = 0;
public int commitCount = 0;
public int doneCount = 0;
public int movedCount = 0;
OpenReplayListener(ReplayListener tmListener)
{
// FEATURE 300768 - allow null ReplayListener during open()
this.tmListener = tmListener;
activeTxHashMap = new HashMap(256);
activeTxHashMap.clear();
}
public void onRecord(LogRecord lr)
{
XACommittingTx tx = null;
int fldSize = 0;
long xacommitKey = 0L; // see XACOMMITMOVED and XADONE
((XALogRecord)lr).setTx(tx);
// pass all non-CTRL records onto TM
if (!lr.isCTRL() && tmListener != null) {
tmListener.onRecord(lr);
return;
}
ByteBuffer b = lr.dataBuffer;
// process XACOMMIT and XADONE CTRL records
switch(lr.type)
{
case LogRecordType.END_OF_LOG:
// signal that we are done
synchronized(this) {
parent.replayNeeded = false;
notifyAll();
}
// let TM look at this LogRecord
if (tmListener != null) tmListener.onRecord(lr);
break;
case LogRecordType.XACOMMITMOVED:
++movedCount;
int sz = b.getShort();
if (sz != 8) {
throw new IllegalArgumentException("Expected 8 found " + sz);
}
// QUESTION: is there a better way to handle this here?
// get log key for the record that was moved
xacommitKey = b.getLong();
// get existing XACommitingTx entry from HashMap if it exists
tx = (XACommittingTx)activeTxHashMap.remove(new Long(xacommitKey));
if (tx != null)
{
// update existing entry
tx.setLogKey(lr.key);
// TM already has seen this entry, so we do not pass this record
break;
}
/*
* This is the first time we have seen this XACOMMIT
* record, so we remove the original xacommitKey
* from the data[] buffer and drop through into
* normal XACOMMIT processing.
*/
int len = b.remaining();
int start = b.position();
System.arraycopy(lr.data, start, lr.data, 0, len);
b.rewind();
b.limit(len);
// FALL THROUGH and process as XACOMMIT
case LogRecordType.XACOMMIT:
++commitCount;
tx = activeTxAdd(lr.key, lr.getFields());
// remember this entry in the HashMap
activeTxHashMap.put(new Long(lr.key), tx);
// give XACommittingTx to TM so it can be passed to putDone
((XALogRecord)lr).setTx(tx);
// pass commit record on to calling TM
if (tmListener != null) tmListener.onRecord(lr);
break;
/*
* Remove corresponding XACOMMIT from the activeTx
* table and return.
*
* The record is not passed on to the TM.
*/
case LogRecordType.XADONE:
++doneCount;
fldSize = b.getShort();
if (fldSize != 8)
throw new IllegalArgumentException("expected 8 found " + fldSize + " at record " + Long.toHexString(lr.key));
// QUESTION: is there a better way to handle this here?
xacommitKey = b.getLong();
// HOWL_0_1_10 and later generate an extra bit of data for JOTM
// Journal files created by older versions will not have this field.
if (b.remaining() > 0) {
fldSize = b.getShort(); // BUG 303907 added index to XADONE for diagnostics
if (fldSize != 4)
throw new IllegalArgumentException("expected 4 found " + fldSize + " at record " + Long.toHexString(lr.key));
b.getInt(); // discard index
}
assert b.remaining() == 0 : "Unexpected data in XADONE record";
/*
* If the XACOMMIT record was recorded to a different file
* it is possible we will not see the XACOMMIT, but we
* may see the XADONE. This is not an error, so just
* ignore this XADONE if it occurs.
*/
tx = (XACommittingTx)activeTxHashMap.remove(new Long(xacommitKey));
if (tx == null) {
++unmatchedDoneCount;
break;
}
// remove this entry from the activeTx table
synchronized(activeTxLock)
{
int index = tx.getIndex();
if (activeTx[index] != tx) throw new IllegalArgumentException();
activeTx[index] = null;
availableTx[atxPut] = tx;
atxPut = (atxPut + 1) % activeTx.length;
--atxUsed;
assert atxUsed >= 0 : "Negative atxUsed (" + atxUsed + ")";
}
// this is an XALogger private record, so no need to pass it on to TM
break;
}
}
public void onError(LogException e)
{
System.err.println("onError: " + e);
replayException = e;
// QUESTION - mark log unusable?
// pass the error onto the TM
if (tmListener != null) tmListener.onError(e);
}
public LogRecord getLogRecord()
{
return lr;
}
}
/**
* private class used by XALogger.replay() methods.
*
* Used by replay(ReplayListener) and replay(ReplayListener, long) wrapper
* methods to intercept XACOMMIT and XACOMMITMOVED records
* so they can be passed to caller.
*
* During TM invoked replay, log records are returned to the
* caller, but the activeTx table is not updated.
*
* @author Michael Giroux
*/
private static class XAReplayListener implements ReplayListener
{
final LogRecord lr;
/**
* ReplayListener registered by TM that instantiated
* this XALogger.
*
*
During replay, non-CTRL records are returned
* to the TM's replayListener.
*/
final ReplayListener tmListener;
XAReplayListener(ReplayListener tmListener)
{
assert tmListener != null: "ReplayListener must be non-null";
this.tmListener = tmListener;
lr = tmListener.getLogRecord();
}
public void onRecord(LogRecord lr)
{
// set LogRecord.tx = null for TM invoked replay.
((XALogRecord)lr).setTx(null);
// pass all non-CTRL records onto TM
if (! lr.isCTRL())
{
tmListener.onRecord(lr);
return;
}
// process CTRL records
switch(lr.type)
{
case LogRecordType.END_OF_LOG:
tmListener.onRecord(lr);
break;
case LogRecordType.XACOMMITMOVED:
ByteBuffer b = lr.dataBuffer;
if (b.getShort() != 8)
throw new IllegalArgumentException();
// QUESTION: is there a better way to handle this here?
// discard the log key for the record that was moved
b.getLong();
// during a TM invoked replay(), all XACOMMIT and XACOMMITMOVED
// records are returned to the TM after removing the xacommitKey
// that was inserted by logOverflowNotification.
int len = b.remaining();
int pos = b.position();
System.arraycopy(lr.data, pos, lr.data, 0, len);
b.rewind();
b.limit(len);
// FALL THROUGH and process as XACOMMIT
case LogRecordType.XACOMMIT:
// pass commit record on to calling TM
tmListener.onRecord(lr);
break;
// All other control records, including XADONE are discarded
default:
break;
}
}
public void onError(LogException e)
{
// pass the error onto the TM
tmListener.onError(e);
}
public LogRecord getLogRecord()
{
return lr;
}
}
}