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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal.cache;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Collections;
import java.util.Set;
import com.gemstone.gemfire.DataSerializer;
import com.gemstone.gemfire.InternalGemFireError;
import com.gemstone.gemfire.cache.CacheException;
import com.gemstone.gemfire.cache.EntryNotFoundException;
import com.gemstone.gemfire.cache.Region;
import com.gemstone.gemfire.cache.RegionDestroyedException;
import com.gemstone.gemfire.cache.TransactionException;
import com.gemstone.gemfire.distributed.internal.DM;
import com.gemstone.gemfire.distributed.internal.DistributionManager;
import com.gemstone.gemfire.distributed.internal.DistributionMessage;
import com.gemstone.gemfire.distributed.internal.InternalDistributedSystem;
import com.gemstone.gemfire.distributed.internal.ReplyException;
import com.gemstone.gemfire.distributed.internal.ReplyMessage;
import com.gemstone.gemfire.distributed.internal.ReplyProcessor21;
import com.gemstone.gemfire.distributed.internal.membership.InternalDistributedMember;
import com.gemstone.gemfire.i18n.LogWriterI18n;
import com.gemstone.gemfire.internal.Assert;
import com.gemstone.gemfire.internal.InternalDataSerializer;
import com.gemstone.gemfire.internal.NanoTimer;
import com.gemstone.gemfire.internal.cache.versions.VersionTag;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
/**
* This message is used as the request for a
* {@link com.gemstone.gemfire.cache.Region#getEntry(Object)}operation. The
* reply is sent in a {@link
* com.gemstone.gemfire.internal.cache.RemoteFetchEntryMessage.FetchEntryReplyMessage}.
*
* @author bruce
* @since 5.1
*/
public final class RemoteFetchEntryMessage extends RemoteOperationMessage
{
private Object key;
/**
* Empty constructor to satisfy {@link DataSerializer} requirements
*/
public RemoteFetchEntryMessage() {
}
private RemoteFetchEntryMessage(InternalDistributedMember recipient,
LocalRegion r, ReplyProcessor21 processor, final TXStateInterface tx,
final Object key) {
super(recipient, r, processor, tx);
this.key = key;
}
/**
* Sends a LocalRegion
* {@link com.gemstone.gemfire.cache.Region#getEntry(Object)} message
*
* @param recipient
* the member that the getEntry message is sent to
* @param r
* the Region for which getEntry was performed upon
* @param tx
* the current TX state
* @param key
* the object to which the value should be feteched
* @return the processor used to fetch the returned value associated with the
* key
* @throws RemoteOperationException if the peer is no longer available
*/
public static FetchEntryResponse send(InternalDistributedMember recipient,
LocalRegion r, final TXStateInterface tx, final Object key)
throws RemoteOperationException
{
Assert.assertTrue(recipient != null, "RemoteFetchEntryMessage NULL recipient");
FetchEntryResponse p = new FetchEntryResponse(r.getSystem(), Collections
.singleton(recipient), r, key);
RemoteFetchEntryMessage m = new RemoteFetchEntryMessage(recipient, r, p,
tx, key);
Set failures = r.getDistributionManager().putOutgoing(m);
if (failures != null && failures.size() > 0) {
throw new RemoteOperationException(
LocalizedStrings.RemoteFetchEntryMessage_FAILED_SENDING_0
.toLocalizedString(m));
}
return p;
}
// final public int getProcessorType()
// {
// return DistributionManager.PARTITIONED_REGION_EXECUTOR;
// }
@Override
public final int getMessageProcessorType() {
// don't use SERIAL_EXECUTOR if we may have to wait for a pending TX
// else if may deadlock as the p2p msg reader thread will be blocked
// don't use SERIAL_EXECUTOR for RepeatableRead isolation level else
// it can block P2P reader thread thus blocking any possible commits
// which could have released the SH lock this thread is waiting on
if (this.pendingTXId == null && !canStartRemoteTransaction()) {
// Make this serial so that it will be processed in the p2p msg reader
// which gives it better performance.
return DistributionManager.SERIAL_EXECUTOR;
}
else {
return DistributionManager.PARTITIONED_REGION_EXECUTOR;
}
}
@Override
public boolean isSevereAlertCompatible() {
// allow forced-disconnect processing for all cache op messages
return true;
}
@Override
protected final boolean operateOnRegion(DistributionManager dm,
LocalRegion r, long startTime) throws RemoteOperationException
{
// RemoteFetchEntryMessage is used in refreshing client caches during interest list recovery,
// so don't be too verbose or hydra tasks may time out
// LogWriterI18n l = r.getCache().getLogger();
// if (DistributionManager.VERBOSE) {
// l.fine(this.toString() + "operateOnRegion: " + r.getFullPath());
// }
if (!(r instanceof PartitionedRegion)) {
r.waitOnInitialization(); // bug #43371 - accessing a region before it's initialized
}
VersionTag versionTag = null;
try {
final TXStateInterface tx = getTXState(r);
if (r.keyRequiresRegionContext()) {
((KeyWithRegionContext)this.key).setRegionContext(r);
}
final Region.Entry re = r.getDataView(tx).getEntry(key, null, r,
true);
if (re == null) {
r.checkEntryNotFound(key);
}
//r.getPrStats().endRemoteOperationMessagesProcessing(startTime);
if (re instanceof EntrySnapshot) {
versionTag = ((EntrySnapshot)re).getVersionTag();
}
FetchEntryReplyMessage.send(getSender(), getProcessorId(), re.getValue(),
versionTag, dm, null, this);
} catch (TransactionException tex) {
FetchEntryReplyMessage.send(getSender(), getProcessorId(), null,
versionTag, dm, new ReplyException(tex), null);
} catch (EntryNotFoundException enfe) {
FetchEntryReplyMessage.send(getSender(), getProcessorId(), null,
versionTag, dm, new ReplyException(LocalizedStrings
.RemoteFetchEntryMessage_ENTRY_NOT_FOUND.toLocalizedString(),
enfe), null);
} catch (PrimaryBucketException pbe) {
FetchEntryReplyMessage.send(getSender(), getProcessorId(), null,
versionTag, dm, new ReplyException(pbe), null);
}
// Unless there was an exception thrown, this message handles sending the
// response
return false;
}
@Override
public final boolean canStartRemoteTransaction() {
return getLockingPolicy().readCanStartTX();
}
@Override
protected void appendFields(StringBuilder buff) {
super.appendFields(buff);
buff.append("; key=").append(this.key);
}
public int getDSFID() {
return R_FETCH_ENTRY_MESSAGE;
}
@Override
public void fromData(DataInput in)
throws IOException, ClassNotFoundException {
super.fromData(in);
this.key = DataSerializer.readObject(in);
}
@Override
public void toData(DataOutput out)
throws IOException {
super.toData(out);
DataSerializer.writeObject(this.key, out);
}
@Override
protected short computeCompressedShort(short flags) {
return flags;
}
public void setKey(Object key)
{
this.key = key;
}
/**
* This message is used for the reply to a {@link RemoteFetchEntryMessage}.
*
* @author mthomas
* @since 5.0
*/
public static final class FetchEntryReplyMessage extends ReplyMessage {
/** Propagated value from remote node to operation initiator */
private Object value;
private VersionTag versionTag;
/**
* Empty constructor to conform to DataSerializable interface
*/
public FetchEntryReplyMessage() {
}
private FetchEntryReplyMessage(int processorId, Object value,
VersionTag versionTag, ReplyException re,
RemoteFetchEntryMessage sourceMessage) {
super(sourceMessage, true, true);
this.processorId = processorId;
this.value = value;
this.versionTag = versionTag;
setException(re);
}
/** Send an ack */
public static void send(InternalDistributedMember recipient,
int processorId, Object value, VersionTag versionTag, DM dm,
ReplyException re, RemoteFetchEntryMessage sourceMessage) {
Assert.assertTrue(recipient != null,
"FetchEntryReplyMessage NULL recipient");
FetchEntryReplyMessage m = new FetchEntryReplyMessage(processorId, value,
versionTag, re, sourceMessage);
m.setRecipient(recipient);
dm.putOutgoing(m);
}
/**
* Processes this message. This method is invoked by the receiver of the
* message.
*
* @param dm
* the distribution manager that is processing the message.
*/
@Override
public void process(final DM dm, final ReplyProcessor21 processor)
{
final long startTime = getTimestamp();
LogWriterI18n l = dm.getLoggerI18n();
if (DistributionManager.VERBOSE) {
l
.fine("FetchEntryReplyMessage process invoking reply processor with processorId:"
+ this.processorId);
}
if (processor == null) {
if (DistributionManager.VERBOSE) {
l.fine("FetchEntryReplyMessage processor not found");
}
return;
}
processor.process(this);
if (DistributionManager.VERBOSE) {
LogWriterI18n logger = dm.getLoggerI18n();
logger.info(LocalizedStrings.RemoteFetchEntryMessage_0__PROCESSED__1, new Object[] {processor, this});
}
dm.getStats().incReplyMessageTime(NanoTimer.getTime() - startTime);
}
public Object getValue() {
return this.value;
}
@Override
public void toData(DataOutput out) throws IOException {
super.toData(out);
byte flags = 0x0;
if (this.value == null) flags = 0x1; // null entry
if (this.versionTag == null) flags |= 0x2; // no version
out.writeByte(flags);
if (this.value != null) {
DataSerializer.writeObject(this.value, out);
}
if (this.versionTag != null) {
InternalDataSerializer.writeObject(this.versionTag, out);
}
}
@Override
public int getDSFID() {
return R_FETCH_ENTRY_REPLY_MESSAGE;
}
@Override
public void fromData(DataInput in) throws IOException,
ClassNotFoundException
{
super.fromData(in);
final byte flags = in.readByte();
if ((flags & 0x1) == 0) {
// since the Entry object shares state with the PartitionedRegion,
// we have to find the region and ask it to create a new Entry instance
// to be populated from the DataInput
FetchEntryResponse processor = (FetchEntryResponse)ReplyProcessor21
.getProcessor(this.processorId);
if (processor == null) {
throw new InternalGemFireError(
"FetchEntryReplyMessage had null processor");
}
this.value = DataSerializer.readObject(in);
}
if ((flags & 0x2) == 0) {
this.versionTag = DataSerializer.readObject(in);
}
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("FetchEntryReplyMessage ").append("processorid=")
.append(this.processorId).append(" reply to sender ")
.append(this.getSender()).append(" returning value=")
.append(this.value).append(", version=").append(this.versionTag);
return sb.toString();
}
}
/**
* A processor to capture the value returned by {@link
* com.gemstone.gemfire.internal.cache.RemoteFetchEntryMessage.FetchEntryReplyMessage}
*
*/
public static class FetchEntryResponse extends RemoteOperationResponse {
private volatile NonLocalRegionEntry returnValue;
final LocalRegion region;
final Object key;
public FetchEntryResponse(InternalDistributedSystem ds, Set recipients,
LocalRegion theRegion, Object key) {
super(ds, recipients);
this.region = theRegion;
this.key = key;
}
@Override
public void process(DistributionMessage msg)
{
try {
if (msg instanceof FetchEntryReplyMessage) {
FetchEntryReplyMessage reply = (FetchEntryReplyMessage)msg;
final Object value = reply.getValue();
if (value != null) {
this.returnValue = NonLocalRegionEntry.newEntry(this.key, value,
this.region, reply.versionTag);
}
if (DistributionManager.VERBOSE) {
getDistributionManager().getLoggerI18n().fine(
"FetchEntryResponse return value is " + this.returnValue);
}
}
}
finally {
super.process(msg);
}
}
/**
* @return Object associated with the key that was sent in the get message
* @throws EntryNotFoundException
* @throws RemoteOperationException if the peer is no longer available
* @throws EntryNotFoundException
*/
public NonLocalRegionEntry waitForResponse()
throws EntryNotFoundException, RemoteOperationException {
try {
// waitForRepliesUninterruptibly();
waitForCacheException();
}
catch (RemoteOperationException e) {
e.checkKey(key);
final String msg = "FetchEntryResponse got remote RemoteOperationException; rethrowing";
getDistributionManager().getLoggerI18n().fine(msg, e);
throw e;
}
catch (EntryNotFoundException e) {
throw e;
}
catch (TransactionException e) {
throw e;
}
catch (RegionDestroyedException e) {
throw e;
}
catch (CacheException ce) {
getDistributionManager().getLoggerI18n().fine("FetchEntryResponse got remote CacheException; forcing reattempt.", ce);
throw new RemoteOperationException(LocalizedStrings.RemoteFetchEntryMessage_FETCHENTRYRESPONSE_GOT_REMOTE_CACHEEXCEPTION_FORCING_REATTEMPT.toLocalizedString(), ce);
}
return this.returnValue;
}
}
}
