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jetbrains.exodus.entitystore.EventsMultiplexer Maven / Gradle / Ivy
/**
* Copyright 2006 - 2017 JetBrains s.r.o.
*
* 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 jetbrains.exodus.entitystore;
import jetbrains.exodus.core.dataStructures.hash.HashMap;
import jetbrains.exodus.core.execution.Job;
import jetbrains.exodus.core.execution.JobProcessor;
import jetbrains.exodus.database.*;
import jetbrains.exodus.database.exceptions.DataIntegrityViolationException;
import jetbrains.exodus.query.metadata.EntityMetaData;
import jetbrains.exodus.query.metadata.ModelMetaData;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class EventsMultiplexer implements TransientStoreSessionListener, IEventsMultiplexer {
private static final ExceptionHandlerImpl EX_HANDLER = new ExceptionHandlerImpl();
private static Logger logger = LoggerFactory.getLogger(EventsMultiplexer.class);
private Map> instanceToListeners = new HashMap<>();
private Map> typeToListeners = new HashMap<>();
private ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
private boolean open = true;
@Nullable
private final JobProcessor eventsMultiplexerJobProcessor;
public EventsMultiplexer() {
this(null);
}
public EventsMultiplexer(@Nullable JobProcessor eventsMultiplexerJobProcessor) {
this.eventsMultiplexerJobProcessor = eventsMultiplexerJobProcessor;
}
public void flushed(@NotNull TransientStoreSession session, @Nullable Set changes) {
// do nothing. actual job is in flushed(changesTracker)
}
/**
* Called directly by transient session
*
* @param changesTracker changes tracker to dispose after async job
*/
public void flushed(@NotNull TransientStoreSession session, @NotNull TransientChangesTracker changesTracker, @Nullable Set changes) {
this.fire(session.getStore(), Where.SYNC_AFTER_FLUSH, changes);
this.asyncFire(session, changes, changesTracker);
}
public void beforeFlush(@NotNull TransientStoreSession session, @Nullable Set changes) {
this.fire(session.getStore(), Where.SYNC_BEFORE_CONSTRAINTS, changes);
}
public void beforeFlushAfterConstraintsCheck(@NotNull TransientStoreSession session, @Nullable Set changes) {
this.fire(session.getStore(), Where.SYNC_BEFORE_FLUSH, changes);
}
public void afterConstraintsFail(@NotNull TransientStoreSession session, @NotNull Set exceptions) {
}
private void asyncFire(@NotNull TransientStoreSession session, final Set changes, TransientChangesTracker changesTracker) {
JobProcessor asyncJobProcessor = getAsyncJobProcessor();
if (asyncJobProcessor == null) {
changesTracker.dispose();
} else {
asyncJobProcessor.queue(new EventsMultiplexer.JobImpl(session.getStore(), this, changes, changesTracker));
}
}
private void fire(TransientEntityStore store, Where where, Set changes) {
for (TransientEntityChange c : changes) {
this.handlePerEntityChanges(where, c);
this.handlePerEntityTypeChanges(store, where, c);
}
}
public void addListener(@NotNull Entity e, @NotNull IEntityListener listener) {
if (((TransientEntity) e).isNew()) {
throw new IllegalStateException("Entity is not saved into database - you can't listern to it.");
}
final EventsMultiplexer.FullEntityId id = new EventsMultiplexer.FullEntityId(e.getStore(), e.getId());
this.rwl.writeLock().lock();
try {
if (open) {
Queue listeners = this.instanceToListeners.get(id);
if (listeners == null) {
listeners = new ConcurrentLinkedQueue<>();
this.instanceToListeners.put(id, listeners);
}
listeners.add(listener);
}
} finally {
this.rwl.writeLock().unlock();
}
}
public void removeListener(@NotNull Entity e, @NotNull IEntityListener listener) {
final EventsMultiplexer.FullEntityId id = new EventsMultiplexer.FullEntityId(e.getStore(), e.getId());
this.rwl.writeLock().lock();
try {
final Queue listeners = this.instanceToListeners.get(id);
if (listeners != null) {
listeners.remove(listener);
if (listeners.size() == 0) {
this.instanceToListeners.remove(id);
}
}
} finally {
this.rwl.writeLock().unlock();
}
}
public void addListener(@NotNull String entityType, @NotNull IEntityListener listener) {
// ensure that this code will be executed outside of transaction
this.rwl.writeLock().lock();
try {
if (open) {
Queue listeners = this.typeToListeners.get(entityType);
if (listeners == null) {
listeners = new ConcurrentLinkedQueue<>();
this.typeToListeners.put(entityType, listeners);
}
listeners.add(listener);
}
} finally {
this.rwl.writeLock().unlock();
}
}
public void removeListener(@NotNull String entityType, @NotNull IEntityListener listener) {
this.rwl.writeLock().lock();
try {
if (open) {
Queue listeners = this.typeToListeners.get(entityType);
if (listeners != null) {
listeners.remove(listener);
if (listeners.size() == 0) {
this.typeToListeners.remove(entityType);
}
}
}
} finally {
this.rwl.writeLock().unlock();
}
}
public void close() {
if (logger.isInfoEnabled()) {
logger.info("Cleaning EventsMultiplexer listeners");
}
this.rwl.writeLock().lock();
open = false;
final Map> notClosedListeners;
// clear listeners
try {
this.typeToListeners.clear();
// copy set
notClosedListeners = new java.util.HashMap<>(this.instanceToListeners);
instanceToListeners.clear();
} finally {
this.rwl.writeLock().unlock();
}
for (final EventsMultiplexer.FullEntityId id : notClosedListeners.keySet()) {
if (logger.isErrorEnabled()) {
logger.error(listenerToString(id, notClosedListeners.get(id)));
}
}
}
public void onClose(@NotNull TransientEntityStore store) {
}
public boolean hasEntityListeners() {
this.rwl.readLock().lock();
try {
return !(instanceToListeners.isEmpty());
} finally {
this.rwl.readLock().unlock();
}
}
public boolean hasEntityListener(TransientEntity entity) {
this.rwl.readLock().lock();
try {
return instanceToListeners.containsKey(new EventsMultiplexer.FullEntityId(entity.getStore(), entity.getId()));
} finally {
this.rwl.readLock().unlock();
}
}
private String listenerToString(final EventsMultiplexer.FullEntityId id, Queue listeners) {
final StringBuilder builder = new StringBuilder(40);
builder.append("Unregistered entity to listener class: ");
id.toString(builder);
builder.append(" ->");
for (IEntityListener listener : listeners) {
builder.append(' ');
builder.append(listener.getClass().getName());
}
return builder.toString();
}
private void handlePerEntityChanges(Where where, TransientEntityChange c) {
final Queue listeners;
final TransientEntity e = c.getTransientEntity();
final EventsMultiplexer.FullEntityId id = new EventsMultiplexer.FullEntityId(e.getStore(), e.getId());
if (where == Where.ASYNC_AFTER_FLUSH && c.getChangeType() == EntityChangeType.REMOVE) {
// unsubscribe all entity listeners, but fire them anyway
this.rwl.writeLock().lock();
try {
listeners = this.instanceToListeners.remove(id);
} finally {
this.rwl.writeLock().unlock();
}
} else {
this.rwl.readLock().lock();
try {
listeners = this.instanceToListeners.get(id);
} finally {
this.rwl.readLock().unlock();
}
}
this.handleChange(where, c, listeners);
}
private void handlePerEntityTypeChanges(TransientEntityStore store, Where where, TransientEntityChange c) {
ModelMetaData modelMedatData = store.getModelMetaData();
if (modelMedatData != null) {
EntityMetaData emd = modelMedatData.getEntityMetaData(c.getTransientEntity().getType());
if (emd != null) {
for (String type : emd.getThisAndSuperTypes()) {
Queue listeners;
this.rwl.readLock().lock();
try {
listeners = this.typeToListeners.get(type);
} finally {
this.rwl.readLock().unlock();
}
this.handleChange(where, c, listeners);
}
}
}
}
@SuppressWarnings("unchecked")
private void handleChange(Where where, TransientEntityChange c, Queue listeners) {
if (listeners != null) {
for (IEntityListener l : listeners) {
try {
switch (where) {
case SYNC_BEFORE_CONSTRAINTS:
switch (c.getChangeType()) {
case ADD:
l.addedSyncBeforeConstraints(c.getTransientEntity());
break;
case UPDATE:
l.updatedSyncBeforeConstraints(c.getSnaphotEntity(), c.getTransientEntity());
break;
case REMOVE:
l.removedSyncBeforeConstraints(c.getSnaphotEntity());
break;
default:
throw new IllegalArgumentException("Illegal arguments " + where + ":" + c.getChangeType());
}
break;
case SYNC_BEFORE_FLUSH:
switch (c.getChangeType()) {
case ADD:
l.addedSyncBeforeFlush(c.getTransientEntity());
break;
case UPDATE:
l.updatedSyncBeforeFlush(c.getSnaphotEntity(), c.getTransientEntity());
break;
case REMOVE:
l.removedSyncBeforeFlush(c.getSnaphotEntity());
break;
default:
throw new IllegalArgumentException("Illegal arguments " + where + ":" + c.getChangeType());
}
break;
case SYNC_AFTER_FLUSH:
switch (c.getChangeType()) {
case ADD:
l.addedSync(c.getTransientEntity());
break;
case UPDATE:
l.updatedSync(c.getSnaphotEntity(), c.getTransientEntity());
break;
case REMOVE:
l.removedSync(c.getSnaphotEntity());
break;
default:
throw new IllegalArgumentException("Illegal arguments " + where + ":" + c.getChangeType());
}
break;
case ASYNC_AFTER_FLUSH:
switch (c.getChangeType()) {
case ADD:
l.addedAsync(c.getTransientEntity());
break;
case UPDATE:
l.updatedAsync(c.getSnaphotEntity(), c.getTransientEntity());
break;
case REMOVE:
l.removedAsync(c.getSnaphotEntity());
break;
default:
throw new IllegalArgumentException("Illegal arguments " + where + ":" + c.getChangeType());
}
break;
default:
throw new IllegalArgumentException("Illegal arguments " + where + ":" + c.getChangeType());
}
} catch (Exception e) {
// rethrow exception only for beforeFlush listeners
if (where == Where.SYNC_BEFORE_CONSTRAINTS) {
if (e instanceof RuntimeException) {
throw (RuntimeException) e;
}
throw new RuntimeException(e);
} else {
if (logger.isErrorEnabled()) {
logger.error("Exception while notifying entity listener.", e);
}
}
}
}
}
}
@Nullable
public JobProcessor getAsyncJobProcessor() {
return this.eventsMultiplexerJobProcessor;
}
private static class JobImpl extends Job {
@NotNull
private TransientEntityStore store;
private Set changes;
private TransientChangesTracker changesTracker;
private EventsMultiplexer eventsMultiplexer;
JobImpl(@NotNull TransientEntityStore store, EventsMultiplexer eventsMultiplexer, Set changes, TransientChangesTracker changesTracker) {
this.eventsMultiplexer = eventsMultiplexer;
this.changes = changes;
this.changesTracker = changesTracker;
this.store = store;
}
public void execute() throws Throwable {
try {
EntityStoreExtensions.run(store, new Runnable() {
@Override
public void run() {
JobImpl.this.eventsMultiplexer.fire(store, Where.ASYNC_AFTER_FLUSH, JobImpl.this.changes);
}
});
} finally {
changesTracker.dispose();
}
}
@Override
public String getName() {
return "Async events from EventMultiplexer";
}
@Override
public String getGroup() {
return changesTracker.getSnapshot().getStore().getLocation();
}
}
private class FullEntityId {
private final int storeHashCode;
private final int entityTypeId;
private final long entityLocalId;
private FullEntityId(final EntityStore store, final EntityId id) {
storeHashCode = System.identityHashCode(store);
entityTypeId = id.getTypeId();
entityLocalId = id.getLocalId();
}
@Override
public boolean equals(Object object) {
if (this == object) {
return true;
}
EventsMultiplexer.FullEntityId that = (EventsMultiplexer.FullEntityId) object;
if (storeHashCode != that.storeHashCode) {
return false;
}
if (entityLocalId != that.entityLocalId) {
return false;
}
return entityTypeId == that.entityTypeId;
}
@Override
public int hashCode() {
int result = storeHashCode;
result = 31 * result + entityTypeId;
result = 31 * result + (int) (entityLocalId ^ (entityLocalId >> 32));
return result;
}
@Override
public String toString() {
final StringBuilder builder = new StringBuilder(10);
toString(builder);
return builder.toString();
}
public void toString(final StringBuilder builder) {
builder.append(entityTypeId);
builder.append('-');
builder.append(entityLocalId);
builder.append('@');
builder.append(storeHashCode);
}
}
}
