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/**
* Copyright Terracotta, Inc.
*
* 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.
*/
package net.sf.ehcache.transaction.local;
import net.sf.ehcache.transaction.SoftLock;
import net.sf.ehcache.transaction.TransactionException;
import net.sf.ehcache.transaction.TransactionID;
import net.sf.ehcache.transaction.TransactionIDFactory;
import net.sf.ehcache.transaction.TransactionTimeoutException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
/**
* A local transaction's thread context
*
* @author Ludovic Orban
*/
public class LocalTransactionContext {
private static final Logger LOG = LoggerFactory.getLogger(LocalTransactionContext.class.getName());
private boolean rollbackOnly;
private final long expirationTimestamp;
private final TransactionIDFactory transactionIdFactory;
private final TransactionID transactionId;
private final Map> softLockMap = new HashMap>();
private final Map storeMap = new HashMap();
private final List listeners = new ArrayList();
/**
* Create a new LocalTransactionContext
* @param transactionTimeout the timeout before the context expires
* @param transactionIdFactory the transaction ID factory to retrieve a new transaction id from
*/
public LocalTransactionContext(int transactionTimeout, TransactionIDFactory transactionIdFactory) {
this.expirationTimestamp = MILLISECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS) +
MILLISECONDS.convert(transactionTimeout, TimeUnit.SECONDS);
this.transactionIdFactory = transactionIdFactory;
this.transactionId = transactionIdFactory.createTransactionID();
}
/**
* Check if the context timed out
* @return true if the context timed out, false otherwise
*/
public boolean timedOut() {
return timeBeforeTimeout() <= 0;
}
/**
* Get the time until this context will expire
* @return the time in milliseconds after which this context will expire
*/
public long timeBeforeTimeout() {
return Math.max(0, expirationTimestamp - MILLISECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS));
}
/**
* Mark the context for rollback
*/
public void setRollbackOnly() {
this.rollbackOnly = true;
}
/**
* Register a soft lock in the context
* @param cacheName the name of the cache this soft lock is in
* @param store the LocalTransactionStore this soft lock is in
* @param softLock the soft lock
*/
public void registerSoftLock(String cacheName, LocalTransactionStore store, SoftLock softLock) {
List softLocks = softLockMap.get(cacheName);
if (softLocks == null) {
softLocks = new ArrayList();
softLockMap.put(cacheName, softLocks);
storeMap.put(cacheName, store);
}
softLocks.add(softLock);
}
//todo this method isn't needed if there is no copy on read/write in the underlying store
/**
* Update a soft lock already registered in the context
* @param cacheName the name of the cache this soft lock is in
* @param softLock the soft lock
*/
public void updateSoftLock(String cacheName, SoftLock softLock) {
List softLocks = softLockMap.get(cacheName);
softLocks.remove(softLock);
softLocks.add(softLock);
}
/**
* Get all soft locks registered in this context for a specific cache
* @param cacheName the name of the cache
* @return a List of registered soft locks for this cache
*/
public List getSoftLocksForCache(String cacheName) {
List softLocks = softLockMap.get(cacheName);
if (softLocks == null) {
return Collections.emptyList();
}
return Collections.unmodifiableList(softLocks);
}
/**
* Check if anything was locked in this transaction's context
* @return true if at least one soft lock got registered, false otherwise
*/
public boolean hasLockedAnything() {
return !softLockMap.isEmpty();
}
/**
* Commit all work done in the context and release all registered soft locks
* @param ignoreTimeout true if commit should proceed no matter the timeout
*/
public void commit(boolean ignoreTimeout) {
if (!ignoreTimeout && timedOut()) {
rollback();
throw new TransactionTimeoutException("transaction timed out, rolled back on commit");
}
if (rollbackOnly) {
rollback();
throw new TransactionException("transaction was marked as rollback only, rolled back on commit");
}
try {
fireBeforeCommitEvent();
if (LOG.isDebugEnabled()) {
LOG.debug("{} participating cache(s), committing transaction {}", softLockMap.keySet().size(), transactionId);
}
freeze();
transactionIdFactory.markForCommit(transactionId);
for (Map.Entry> stringListEntry : softLockMap.entrySet()) {
String cacheName = stringListEntry.getKey();
LocalTransactionStore store = storeMap.get(cacheName);
List softLocks = stringListEntry.getValue();
LOG.debug("committing soft locked values of cache {}", cacheName);
store.commit(softLocks);
}
LOG.debug("committed transaction {}", transactionId);
} finally {
unfreezeAndUnlock();
softLockMap.clear();
storeMap.clear();
fireAfterCommitEvent();
}
}
/**
* Rollback all work done in the context and release all registered soft locks
*/
public void rollback() {
try {
if (LOG.isDebugEnabled()) {
LOG.debug("{} participating cache(s), rolling back transaction {}", softLockMap.keySet().size(), transactionId);
}
freeze();
for (Map.Entry> stringListEntry : softLockMap.entrySet()) {
String cacheName = stringListEntry.getKey();
LocalTransactionStore store = storeMap.get(cacheName);
List softLocks = stringListEntry.getValue();
LOG.debug("rolling back soft locked values of cache {}", cacheName);
store.rollback(softLocks);
}
LOG.debug("rolled back transaction {}", transactionId);
} finally {
unfreezeAndUnlock();
softLockMap.clear();
storeMap.clear();
fireAfterRollbackEvent();
}
}
/**
* Get the transaction ID of the context
* @return the transaction ID
*/
public TransactionID getTransactionId() {
return transactionId;
}
/**
* Add a TransactionListener to this context
* @param listener the listener
*/
public void addListener(TransactionListener listener) {
this.listeners.add(listener);
}
private void fireBeforeCommitEvent() {
for (TransactionListener listener : listeners) {
try {
listener.beforeCommit();
} catch (Exception e) {
LOG.error("beforeCommit error", e);
}
}
}
private void fireAfterCommitEvent() {
for (TransactionListener listener : listeners) {
try {
listener.afterCommit();
} catch (Exception e) {
LOG.error("afterCommit error", e);
}
}
}
private void fireAfterRollbackEvent() {
for (TransactionListener listener : listeners) {
try {
listener.afterRollback();
} catch (Exception e) {
LOG.error("afterRollback error", e);
}
}
}
private void unfreezeAndUnlock() {
LOG.debug("unfreezing and unlocking {} soft lock(s)", softLockMap.size());
for (Map.Entry> stringListEntry : softLockMap.entrySet()) {
List softLocks = stringListEntry.getValue();
for (SoftLock softLock : softLocks) {
try {
softLock.unfreeze();
LOG.debug("unfroze {}", softLock);
} catch (Exception e) {
LOG.error("error unfreezing " + softLock, e);
}
try {
softLock.unlock();
LOG.debug("unlocked {}", softLock);
} catch (Exception e) {
LOG.error("error unlocking " + softLock, e);
}
}
}
}
private void freeze() {
for (Map.Entry> stringListEntry : softLockMap.entrySet()) {
List softLocks = stringListEntry.getValue();
for (SoftLock softLock : softLocks) {
softLock.freeze();
}
}
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return transactionId.hashCode();
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (obj instanceof LocalTransactionContext) {
LocalTransactionContext otherCtx = (LocalTransactionContext) obj;
return transactionId.equals(otherCtx.transactionId);
}
return false;
}
}
