/*
* Galaxy
* Copyright (c) 2012-2014, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
*/
package co.paralleluniverse.galaxy.core;
import co.paralleluniverse.common.MonitoringType;
import co.paralleluniverse.common.io.Persistables;
import static co.paralleluniverse.common.logging.LoggingUtils.hex;
import co.paralleluniverse.common.util.DegenerateInvocationHandler;
import co.paralleluniverse.galaxy.Cluster;
import co.paralleluniverse.galaxy.cluster.NodeChangeListener;
import static co.paralleluniverse.galaxy.core.Cache.isReserved;
import co.paralleluniverse.galaxy.core.Message.BACKUP;
import co.paralleluniverse.galaxy.core.Message.BACKUP_PACKET;
import co.paralleluniverse.galaxy.core.Message.LineMessage;
import co.paralleluniverse.galaxy.server.MainMemoryDB;
import co.paralleluniverse.galaxy.server.MainMemoryEntry;
import com.google.common.base.Throwables;
import java.beans.ConstructorProperties;
import java.lang.reflect.Proxy;
import java.nio.ByteBuffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* @author pron
*/
public class MainMemory extends ClusterService implements MessageReceiver, NodeChangeListener {
private static final Logger LOG = LoggerFactory.getLogger(MainMemory.class);
private static final short SERVER = 0;
private final Comm comm;
private final MainMemoryDB store;
private final MainMemoryMonitor monitor;
@ConstructorProperties({"name", "cluster", "store", "comm", "monitoringType"})
public MainMemory(String name, Cluster cluster, MainMemoryDB store, Comm comm, MonitoringType monitoringType) {
this(name, cluster, store, comm, createMonitor(monitoringType, name));
}
MainMemory(String name, Cluster cluster, MainMemoryDB store, Comm comm, MainMemoryMonitor monitor) {
super(name, cluster);
this.comm = comm;
this.store = store;
this.monitor = monitor;
monitor.setMonitoredObject(this);
cluster.addNodeChangeListener(this);
comm.setReceiver(this);
}
@Override
protected void start(boolean master) {
if (master) {
if (LOG.isDebugEnabled()) {
LOG.debug("Performing store dump:");
store.dump(System.err);
}
((RefAllocator) getCluster()).setCounter(store.getMaxId() + 1);
}
setReady(true);
}
@Override
public void switchToMaster() {
super.switchToMaster();
}
@Override
protected void shutdown() {
store.close();
}
private static MainMemoryMonitor createMonitor(MonitoringType monitoringType, String name) {
if (monitoringType == null)
return (MainMemoryMonitor) Proxy.newProxyInstance(MainMemory.class.getClassLoader(), new Class<?>[]{MainMemoryMonitor.class}, DegenerateInvocationHandler.INSTANCE);
else
switch (monitoringType) {
case JMX:
return new JMXMainMemoryMonitor(name);
case METRICS:
return new MetricsMainMemoryMonitor();
}
throw new IllegalArgumentException("Unknown MonitoringType " + monitoringType);
}
@Override
public void receive(Message message) {
// if (!getCluster().isMaster()) {
// LOG.debug("Ignoring message {} 'cause I'm just a slave.");
// return;
// }
LOG.debug("Received: {}", message);
switch (message.getType()) {
case GET:
case GETX:
handleMessageGet((Message.GET) message);
break;
case INV:
handleMessageInvalidate((Message.INV) message);
break;
case DEL:
handleMessageDelete((LineMessage) message);
break;
case MSG:
handleMessageMsg((Message.MSG) message);
break;
case BACKUP_PACKET:
handleMessageBackup((BACKUP_PACKET) message);
break;
case INVOKE:
handleMessageGet((LineMessage) message); // Server cant invoke, return putx, chnged_owner or notFound.
break;
}
}
void send(Message message) {
LOG.debug("Sending: {}", message);
try {
comm.send(message);
} catch (NodeNotFoundException e) {
}
}
private boolean handleMessageGet(LineMessage msg) {
final long id = msg.getLine();
for (;;) {
short owner;
if (isReserved(id) && store.casOwner(id, (short) -1, msg.getNode()) == msg.getNode()) { // if nonexistent root - create it
if (LOG.isDebugEnabled())
LOG.debug("Owner of reserved line {} is now node {} (CAS)", hex(id), msg.getNode());
monitor.addOwnerWrite();
monitor.addObjectServed();
store.write(id, msg.getNode(), 1, new byte[0], null);
send(Message.PUTX(msg, id, new short[0], 1, null));
return true;
} else if ((owner = store.casOwner(id, SERVER, msg.getNode())) == msg.getNode()) { // if owner is server, then transfer ownership
MainMemoryEntry entry = store.read(id);
if (LOG.isDebugEnabled())
LOG.debug("Owner of line {} is now node {} (previously owned by server)", hex(id), msg.getNode());
monitor.addOwnerWrite();
monitor.addObjectServed();
send(Message.PUTX(msg, id, new short[0], entry.version, ByteBuffer.wrap(entry.data)));
return true;
}
if (owner == -1 && !isReserved(id)) {
send(Message.NOT_FOUND(msg));
return false;
} else if (owner > SERVER) {
// if (owner == msg.getNode()) {// probably a slave turned master
// MainMemoryEntry entry = store.read(id);
// send(Message.PUTX(msg, id, new short[0], entry.version, ByteBuffer.wrap(entry.data)));
// monitor.addObjectServed();
// } else
send(Message.CHNGD_OWNR(msg, id, owner, true));
monitor.addOwnerServed();
return false;
}
LOG.debug("casOwner returned {}", owner);
}
}
private void handleMessageInvalidate(Message.INV msg) {
final long id = msg.getLine();
final short owner = msg.getNode();
final short previousOwner = msg.getPreviousOwner();
// if mesages are sent to server instead of broadcast, node B may get a putx from node A, then node A would die (before B INVs the server)
// then node C gets the line from the server, and then node B INVs the server, we must INV B (in this case, B will wait for our response. See Cache.transitionToE())
// so, we check to see where A got the line from (previous owner). Since it's B but we already have C as the owner, we INV instead of INVACK.
short currentOwner;
if ((currentOwner = store.casOwner(id, previousOwner, owner)) == owner) {
if (LOG.isDebugEnabled())
LOG.debug("Got INV: Owner of line {} is now node {}", hex(id), msg.getNode());
monitor.addOwnerWrite();
send(Message.INVACK(msg));
} else {
if (LOG.isDebugEnabled())
LOG.debug("Got INV of line {} from {}, but different owner ({}) listed so replying INV", new Object[]{hex(id), msg.getNode(), currentOwner});
monitor.addOwnerServed();
send(Message.INV(msg, id, currentOwner));
}
}
private void handleMessageDelete(LineMessage msg) {
final long id = msg.getLine();
final short owner = msg.getNode();
if (LOG.isDebugEnabled())
LOG.debug("Line {} deleted.", hex(id));
final Object txn = store.beginTransaction();
try {
store.delete(id, txn);
store.commit(txn);
send(Message.INVACK(msg));
} catch (Exception e) {
LOG.error("Exception during delete. Aborting transaction.", e);
store.abort(txn);
throw Throwables.propagate(e);
}
}
private void handleMessageMsg(Message.MSG msg) {
final long id = msg.getLine();
if (handleMessageGet(msg))
send(Message.MSG(msg.getNode(), id, msg.getData())); // return to sender, immediately following a PUTX
}
private void handleMessageBackup(BACKUP_PACKET msg) {
final Object txn = store.beginTransaction();
try {
monitor.addTransaction(msg.getBackups().size());
for (BACKUP backup : msg.getBackups()) {
if (LOG.isDebugEnabled())
LOG.debug("Backing up version {} of line {} data: {}", new Object[]{backup.getVersion(), hex(backup.getLine()), backup.getData() != null ? "(" + backup.getData().remaining() + " bytes)" : "null"});
store.write(backup.getLine(), msg.getNode(), backup.getVersion(), Persistables.toByteArray(backup.getData()), txn);
}
store.commit(txn);
send(Message.BACKUP_PACKETACK(msg));
} catch (Exception e) {
LOG.error("Exception during DB operation. Aborting transaction.", e);
store.abort(txn);
throw Throwables.propagate(e);
}
}
@Override
public void nodeRemoved(short node) {
LOG.info("Node {} removed. Server now owns its lines.", node);
store.removeOwner(node);
}
@Override
public void nodeAdded(short id) {
}
@Override
public void nodeSwitched(short id) {
}
}