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ARTEMIS-1356 Avoid allocations and atomic operations to recognize handler's thread

This commit is contained in:
Francesco Nigro 2017-08-21 15:03:17 +02:00 committed by Clebert Suconic
parent ce01faeac7
commit e0881448c1
1 changed files with 25 additions and 5 deletions
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30
artemis-server/src/main/java/org/apache/activemq/artemis/core/protocol/core/ServerSessionPacketHandler.java
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@ -19,7 +19,6 @@ package org.apache.activemq.artemis.core.protocol.core;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.activemq.artemis.api.core.ActiveMQException;
import org.apache.activemq.artemis.api.core.ActiveMQExceptionType;
@ -159,7 +158,11 @@ public class ServerSessionPacketHandler implements ChannelHandler {
private final boolean direct;
private static final ThreadLocal<AtomicBoolean> inHandler = ThreadLocal.withInitial(AtomicBoolean::new);
//marker instance used to recognize if a thread is performing a packet handling
private static final Object DUMMY = Boolean.TRUE;
//a thread that has its thread-local map populated with DUMMY is performing a packet handling
private static final ThreadLocal<Object> inHandler = new ThreadLocal<>();
public ServerSessionPacketHandler(final ActiveMQServer server,
final CoreProtocolManager manager,
@ -227,8 +230,25 @@ public class ServerSessionPacketHandler implements ChannelHandler {
ActiveMQServerLogger.LOGGER.clearingUpSession(session.getName());
}
private static void onStartMessagePacketHandler() {
assert inHandler.get() != null : "recursion on packet handling is not supported";
inHandler.set(DUMMY);
}
private static boolean inHandler() {
final Object dummy = inHandler.get();
//sanity check: can't exist a thread using a marker different from DUMMY
assert ((dummy != null && dummy == DUMMY) || dummy == null) : "wrong marker";
return dummy != null;
}
private static void onExitMessagePacketHandler() {
assert inHandler.get() == null : "marker not set";
inHandler.set(null);
}
public void flushExecutor() {
if (!inHandler.get().get()) {
if (!inHandler()) {
packetActor.flush();
callExecutor.flush();
}
@ -261,7 +281,7 @@ public class ServerSessionPacketHandler implements ChannelHandler {
if (logger.isTraceEnabled()) {
logger.trace("ServerSessionPacketHandler::handlePacket," + packet);
}
inHandler.get().set(true);
onStartMessagePacketHandler();
try {
final byte type = packet.getType();
switch (type) {
@ -287,7 +307,7 @@ public class ServerSessionPacketHandler implements ChannelHandler {
break;
}
} finally {
inHandler.get().set(false);
onExitMessagePacketHandler();
}
}