-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
ReplicatedTransactionSerializer.java
221 lines (202 loc) · 7.88 KB
/
ReplicatedTransactionSerializer.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.core.state.machines.tx;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.stream.ChunkedInput;
import io.netty.util.ReferenceCountUtil;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.LinkedList;
import java.util.Queue;
import org.neo4j.causalclustering.helper.ErrorHandler;
import org.neo4j.causalclustering.messaging.BoundedNetworkChannel;
import org.neo4j.causalclustering.messaging.marshalling.ByteArrayChunkedEncoder;
import org.neo4j.causalclustering.messaging.marshalling.OutputStreamWritableChannel;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.storageengine.api.ReadableChannel;
import org.neo4j.storageengine.api.WritableChannel;
import static org.neo4j.causalclustering.core.state.machines.tx.ReplicatedTransactionFactory.transactionalRepresentationWriter;
public class ReplicatedTransactionSerializer
{
private ReplicatedTransactionSerializer()
{
}
public static ReplicatedTransaction unmarshal( ByteBuf byteBuf )
{
int length = byteBuf.readInt();
if ( length == -1 )
{
length = byteBuf.readableBytes();
}
byte[] bytes = new byte[length];
byteBuf.readBytes( bytes );
return ReplicatedTransaction.from( bytes );
}
public static ReplicatedTransaction unmarshal( ReadableChannel channel ) throws IOException
{
int txBytesLength = channel.getInt();
byte[] txBytes = new byte[txBytesLength];
channel.get( txBytes, txBytesLength );
return ReplicatedTransaction.from( txBytes );
}
public static void marshal( WritableChannel writableChannel, ByteArrayReplicatedTransaction replicatedTransaction ) throws IOException
{
int length = replicatedTransaction.getTxBytes().length;
writableChannel.putInt( length );
writableChannel.put( replicatedTransaction.getTxBytes(), length );
}
public static void marshal( WritableChannel writableChannel, TransactionRepresentationReplicatedTransaction replicatedTransaction ) throws IOException
{
/*
Unknown length. This method will never be used in production. When a ReplicatedTransaction is serialized it has already passed over the network
and a more efficient marshalling is used in ByteArrayReplicatedTransaction.
*/
ReplicatedTransactionFactory.TransactionRepresentationWriter txWriter = transactionalRepresentationWriter( replicatedTransaction.tx() );
ByteArrayOutputStream outputStream = new ByteArrayOutputStream( 1024 );
OutputStreamWritableChannel outputStreamWritableChannel = new OutputStreamWritableChannel( outputStream );
while ( txWriter.canWrite() )
{
txWriter.write( outputStreamWritableChannel );
}
int length = outputStream.size();
writableChannel.putInt( length );
writableChannel.put( outputStream.toByteArray(), length );
}
public static ChunkedInput<ByteBuf> encode( TransactionRepresentationReplicatedTransaction representationReplicatedTransaction )
{
return new TxRepresentationMarshal( representationReplicatedTransaction.tx() );
}
public static ChunkedInput<ByteBuf> encode( ByteArrayReplicatedTransaction byteArrayReplicatedTransaction )
{
return new ByteArrayChunkedEncoder( byteArrayReplicatedTransaction.getTxBytes() );
}
private static class TxRepresentationMarshal implements ChunkedInput<ByteBuf>
{
private static final int CHUNK_SIZE = 32 * 1024;
private final ReplicatedTransactionFactory.TransactionRepresentationWriter txWriter;
private BoundedNetworkChannel channel;
private Queue<ByteBuf> chunks = new LinkedList<>();
private TxRepresentationMarshal( TransactionRepresentation replicatedTransaction )
{
txWriter = ReplicatedTransactionFactory.transactionalRepresentationWriter( replicatedTransaction );
}
@Override
public boolean isEndOfInput()
{
return channel != null && channel.closed() && chunks.isEmpty();
}
@Override
public void close()
{
try ( ErrorHandler errorHandler = new ErrorHandler( "Closing TxRepresentationMarshal" ) )
{
if ( channel != null )
{
try
{
channel.close();
}
catch ( Throwable t )
{
errorHandler.add( t );
}
}
if ( !chunks.isEmpty() )
{
for ( ByteBuf byteBuf : chunks )
{
try
{
ReferenceCountUtil.release( byteBuf );
}
catch ( Throwable t )
{
errorHandler.add( t );
}
}
}
}
}
@Override
public ByteBuf readChunk( ChannelHandlerContext ctx ) throws Exception
{
return readChunk( ctx.alloc() );
}
@Override
public ByteBuf readChunk( ByteBufAllocator allocator ) throws Exception
{
if ( isEndOfInput() )
{
return null;
}
if ( channel == null )
{
// Ensure that the written buffers does not overflow the allocators chunk size.
channel = new BoundedNetworkChannel( allocator, CHUNK_SIZE, chunks );
/*
Unknown length. The reason for sending this int is to avoid conflicts with Raft V1.
This way, the serialized result of this object is identical to a serialized byte array. Which is the only type in Raft V1.
*/
channel.putInt( -1 );
}
try
{
// write to chunks if empty and there is more to write
while ( txWriter.canWrite() && chunks.isEmpty() )
{
txWriter.write( channel );
}
// nothing more to write, close the channel to get the potential last buffer
if ( chunks.isEmpty() )
{
channel.close();
}
return chunks.poll();
}
catch ( Throwable t )
{
try
{
close();
}
catch ( Exception e )
{
t.addSuppressed( e );
}
throw t;
}
}
@Override
public long length()
{
return -1;
}
@Override
public long progress()
{
return 0;
}
}
}