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*
* Copyright (c) 2014-2016 Oracle and/or its affiliates. All rights reserved.
*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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*/
package org.glassfish.hk2.configuration.hub.internal;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import javax.inject.Inject;
import org.glassfish.hk2.api.DescriptorVisibility;
import org.glassfish.hk2.api.IterableProvider;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.Visibility;
import org.glassfish.hk2.configuration.hub.api.BeanDatabase;
import org.glassfish.hk2.configuration.hub.api.BeanDatabaseUpdateListener;
import org.glassfish.hk2.configuration.hub.api.Change;
import org.glassfish.hk2.configuration.hub.api.CommitFailedException;
import org.glassfish.hk2.configuration.hub.api.Hub;
import org.glassfish.hk2.configuration.hub.api.PrepareFailedException;
import org.glassfish.hk2.configuration.hub.api.RollbackFailedException;
import org.glassfish.hk2.configuration.hub.api.WriteableBeanDatabase;
import org.jvnet.hk2.annotations.ContractsProvided;
import org.jvnet.hk2.annotations.Service;
/**
* @author jwells
*
*/
@Service
@ContractsProvided(Hub.class)
@Visibility(DescriptorVisibility.LOCAL)
public class HubImpl implements Hub {
private static final AtomicLong revisionCounter = new AtomicLong(1);
private final Object lock = new Object();
private BeanDatabaseImpl currentDatabase = new BeanDatabaseImpl(revisionCounter.getAndIncrement());
@Inject
private IterableProvider listeners;
/* (non-Javadoc)
* @see org.glassfish.hk2.configuration.hub.api.Hub#getCurrentDatabase()
*/
@Override
public BeanDatabase getCurrentDatabase() {
synchronized (lock) {
return currentDatabase;
}
}
/* (non-Javadoc)
* @see org.glassfish.hk2.configuration.hub.api.Hub#getWriteableDatabaseCopy()
*/
@Override
public WriteableBeanDatabase getWriteableDatabaseCopy() {
synchronized (lock) {
return new WriteableBeanDatabaseImpl(this, currentDatabase);
}
}
private int inTransaction = 0;
/* package */ LinkedList prepareCurrentDatabase(WriteableBeanDatabaseImpl writeableDatabase, Object commitMessage, List changes) {
synchronized (lock) {
if (inTransaction > 0) {
throw new IllegalStateException("This Hub is already in a transaction");
}
long currentRevision = currentDatabase.getRevision();
long writeRevision = writeableDatabase.getBaseRevision();
if (currentRevision != writeRevision) {
throw new IllegalStateException("commit was called on a WriteableDatabase but the current database has changed after that copy was made");
}
LinkedList completedListeners = new LinkedList();
for (BeanDatabaseUpdateListener listener : listeners) {
try {
listener.prepareDatabaseChange(currentDatabase, writeableDatabase, commitMessage, changes);
completedListeners.add(listener);
}
catch (Throwable th) {
// Rollback time
MultiException throwMe = new MultiException(new PrepareFailedException(th));
for (BeanDatabaseUpdateListener completedListener : completedListeners) {
try {
completedListener.rollbackDatabaseChange(currentDatabase, writeableDatabase, commitMessage, changes);
}
catch (Throwable rollTh) {
throwMe.addError(new RollbackFailedException(rollTh));
}
}
throw throwMe;
}
}
inTransaction++;
return completedListeners;
}
}
/* package */ void activateCurrentDatabase(WriteableBeanDatabaseImpl writeableDatabase, Object commitMessage, List changes,
LinkedList completedListeners) {
synchronized (lock) {
inTransaction--;
if (inTransaction < 0) inTransaction = 0;
List completed = completedListeners;
completedListeners = null;
if (completed == null) completed = Collections.emptyList();
// success!
BeanDatabaseImpl oldDatabase = currentDatabase;
currentDatabase = new BeanDatabaseImpl(revisionCounter.getAndIncrement(), writeableDatabase);
MultiException commitError = null;
for (BeanDatabaseUpdateListener completedListener : completed) {
try {
completedListener.commitDatabaseChange(oldDatabase, currentDatabase, commitMessage, changes);
}
catch (Throwable th) {
if (commitError == null) {
commitError = new MultiException(new CommitFailedException(th));
}
else {
commitError.addError(new CommitFailedException(th));
}
}
}
if (commitError != null) throw commitError;
}
}
/* package */ void rollbackCurrentDatabase(WriteableBeanDatabaseImpl writeableDatabase, Object commitMessage, List changes,
LinkedList completedListeners) {
synchronized (lock) {
inTransaction--;
if (inTransaction < 0) inTransaction = 0;
List completed = completedListeners;
completedListeners = null;
if (completed == null) completed = Collections.emptyList();
MultiException rollbackError = null;
for (BeanDatabaseUpdateListener completedListener : completed) {
try {
completedListener.rollbackDatabaseChange(currentDatabase, writeableDatabase, commitMessage, changes);
}
catch (Throwable th) {
if (rollbackError == null) {
rollbackError = new MultiException(new RollbackFailedException(th));
}
else {
rollbackError.addError(new RollbackFailedException(th));
}
}
}
if (rollbackError != null) throw rollbackError;
}
}
/* package */ void setCurrentDatabase(WriteableBeanDatabaseImpl writeableDatabase, Object commitMessage, List changes) {
LinkedList completedListeners = prepareCurrentDatabase(writeableDatabase, commitMessage, changes);
activateCurrentDatabase(writeableDatabase, commitMessage, changes, completedListeners);
}
}
