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Neo4j kernel is a lightweight, embedded Java database designed to
store data structured as graphs rather than tables. For more
information, see http://neo4j.org.
/**
* Copyright (c) 2002-2013 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see keyRecords = record.getNameRecords();
buffer.putInt( keyRecords.size() );
for ( DynamicRecord keyRecord : keyRecords )
{
writeDynamicRecord( buffer, keyRecord );
}
}
}
public static Command readCommand( NeoStore neoStore, ReadableByteChannel byteChannel,
ByteBuffer buffer ) throws IOException
{
// id+in_use(byte)+count(int)+key_blockId(int)+nr_key_records(int)
buffer.clear();
buffer.limit( 17 );
if ( byteChannel.read( buffer ) != buffer.limit() )
{
return null;
}
buffer.flip();
int id = buffer.getInt();
byte inUseFlag = buffer.get();
boolean inUse = false;
if ( (inUseFlag & Record.IN_USE.byteValue()) == Record.IN_USE
.byteValue() )
{
inUse = true;
}
else if ( inUseFlag != Record.NOT_IN_USE.byteValue() )
{
throw new IOException( "Illegal in use flag: " + inUseFlag );
}
PropertyIndexRecord record = new PropertyIndexRecord( id );
record.setInUse( inUse );
record.setPropertyCount( buffer.getInt() );
record.setNameId( buffer.getInt() );
int nrKeyRecords = buffer.getInt();
for ( int i = 0; i < nrKeyRecords; i++ )
{
DynamicRecord dr = readDynamicRecord( byteChannel, buffer );
if ( dr == null )
{
return null;
}
record.addNameRecord( dr );
}
return new PropertyIndexCommand( neoStore == null ? null : neoStore.getPropertyStore()
.getIndexStore(), record );
}
@Override
public boolean equals( Object o )
{
if ( !(o instanceof PropertyIndexCommand) )
{
return false;
}
return getKey() == ((Command) o).getKey();
}
}
static class PropertyCommand extends Command
{
private final PropertyRecord record;
private final PropertyStore store;
PropertyCommand( PropertyStore store, PropertyRecord record )
{
super( record.getId() );
this.record = record;
this.store = store;
}
@Override
public void accept( CommandRecordVisitor visitor )
{
visitor.visitProperty( record );
}
@Override
void removeFromCache( TransactionState state )
{
long nodeId = this.getNodeId();
long relId = this.getRelId();
if ( nodeId != -1 )
{
state.removeNodeFromCache( nodeId );
}
else if ( relId != -1 )
{
state.removeRelationshipFromCache( relId );
}
}
@Override
boolean isCreated()
{
return record.isCreated();
}
@Override
boolean isDeleted()
{
return !record.inUse();
}
@Override
public void execute()
{
if ( isRecovered() )
{
store.updateRecord( record, true );
}
else
{
store.updateRecord( record );
}
}
public long getNodeId()
{
return record.getNodeId();
}
public long getRelId()
{
return record.getRelId();
}
@Override
public String toString()
{
return record.toString();
}
@Override
public void writeToFile( LogBuffer buffer ) throws IOException
{
byte inUse = record.inUse() ? Record.IN_USE.byteValue()
: Record.NOT_IN_USE.byteValue();
if ( record.getRelId() != -1 )
{
inUse += Record.REL_PROPERTY.byteValue();
}
buffer.put( PROP_COMMAND );
buffer.putLong( record.getId() ); // 8
buffer.put( inUse ); // 1
buffer.putLong( record.getNextProp() ).putLong(
record.getPrevProp() ); // 8 + 8
long nodeId = record.getNodeId();
long relId = record.getRelId();
if ( nodeId != -1 )
{
buffer.putLong( nodeId ); // 8 or
}
else if ( relId != -1 )
{
buffer.putLong( relId ); // 8 or
}
else
{
// means this records value has not changed, only place in
// prop chain
buffer.putLong( -1 ); // 8
}
buffer.put( (byte) record.getPropertyBlocks().size() ); // 1
for ( int i = 0; i < record.getPropertyBlocks().size(); i++ )
{
PropertyBlock block = record.getPropertyBlocks().get( i );
assert block.getSize() > 0 : record + " seems kinda broken";
writePropertyBlock( buffer, block );
}
buffer.putInt( record.getDeletedRecords().size() ); // 4
for ( int i = 0; i < record.getDeletedRecords().size(); i++ )
{
DynamicRecord dynRec = record.getDeletedRecords().get( i );
writeDynamicRecord( buffer, dynRec );
}
}
public static Command readCommand( NeoStore neoStore,
ReadableByteChannel byteChannel, ByteBuffer buffer )
throws IOException
{
// id+in_use(byte)+type(int)+key_indexId(int)+prop_blockId(long)+
// prev_prop_id(long)+next_prop_id(long)
buffer.clear();
buffer.limit( 8 + 1 + 8 + 8 + 8 );
if ( byteChannel.read( buffer ) != buffer.limit() )
{
return null;
}
buffer.flip();
long id = buffer.getLong(); // 8
PropertyRecord record = new PropertyRecord( id );
byte inUseFlag = buffer.get(); // 1
long nextProp = buffer.getLong(); // 8
long prevProp = buffer.getLong(); // 8
record.setNextProp( nextProp );
record.setPrevProp( prevProp );
boolean inUse = false;
if ( ( inUseFlag & Record.IN_USE.byteValue() ) == Record.IN_USE.byteValue() )
{
inUse = true;
}
boolean nodeProperty = true;
if ( ( inUseFlag & Record.REL_PROPERTY.byteValue() ) == Record.REL_PROPERTY.byteValue() )
{
nodeProperty = false;
}
long primitiveId = buffer.getLong(); // 8
if ( primitiveId != -1 && nodeProperty )
{
record.setNodeId( primitiveId );
}
else if ( primitiveId != -1 )
{
record.setRelId( primitiveId );
}
buffer.clear();
buffer.limit( 1 );
if ( byteChannel.read( buffer ) != buffer.limit() )
{
return null;
}
buffer.flip();
int nrPropBlocks = buffer.get(); // 1
assert nrPropBlocks >= 0;
if ( nrPropBlocks > 0 )
{
record.setInUse( true );
}
while ( nrPropBlocks-- > 0 )
{
PropertyBlock block = readPropertyBlock( byteChannel, buffer );
if ( block == null )
{
return null;
}
record.addPropertyBlock( block );
}
// Time to read in the deleted dynamic records
buffer.clear();
buffer.limit( 4 );
if ( byteChannel.read( buffer ) != buffer.limit() )
{
return null;
}
buffer.flip();
int deletedRecords = buffer.getInt(); // 4
assert deletedRecords >= 0;
while ( deletedRecords-- > 0 )
{
DynamicRecord read = readDynamicRecord( byteChannel, buffer );
if ( read == null )
{
return null;
}
assert !read.inUse() : read + " is kinda weird";
record.addDeletedRecord( read );
}
if ( ( inUse && !record.inUse() ) || ( !inUse && record.inUse() ) )
{
throw new IllegalStateException( "Weird, inUse was read in as "
+ inUse
+ " but the record is "
+ record );
}
return new PropertyCommand( neoStore == null ? null
: neoStore.getPropertyStore(), record );
}
@Override
public boolean equals( Object o )
{
if ( !(o instanceof PropertyCommand) )
{
return false;
}
return getKey() == ((Command) o).getKey();
}
}
static class RelationshipTypeCommand extends Command
{
private final RelationshipTypeRecord record;
private final RelationshipTypeStore store;
RelationshipTypeCommand( RelationshipTypeStore store,
RelationshipTypeRecord record )
{
super( record.getId() );
this.record = record;
this.store = store;
}
@Override
public void accept( CommandRecordVisitor visitor )
{
visitor.visitRelationshipType( record );
}
@Override
void removeFromCache( TransactionState state )
{
// no-op
}
@Override
boolean isCreated()
{
return record.isCreated();
}
@Override
boolean isDeleted()
{
return !record.inUse();
}
@Override
public void execute()
{
if ( isRecovered() )
{
store.updateRecord( record, true );
}
else
{
store.updateRecord( record );
}
}
@Override
public String toString()
{
return record.toString();
}
@Override
public void writeToFile( LogBuffer buffer ) throws IOException
{
// id+in_use(byte)+type_blockId(int)+nr_type_records(int)
byte inUse = record.inUse() ? Record.IN_USE.byteValue()
: Record.NOT_IN_USE.byteValue();
buffer.put( REL_TYPE_COMMAND );
buffer.putInt( record.getId() ).put( inUse ).putInt( record.getNameId() );
Collection typeRecords = record.getNameRecords();
buffer.putInt( typeRecords.size() );
for ( DynamicRecord typeRecord : typeRecords )
{
writeDynamicRecord( buffer, typeRecord );
}
}
public static Command readCommand( NeoStore neoStore,
ReadableByteChannel byteChannel, ByteBuffer buffer )
throws IOException
{
// id+in_use(byte)+type_blockId(int)+nr_type_records(int)
buffer.clear();
buffer.limit( 13 );
if ( byteChannel.read( buffer ) != buffer.limit() )
{
return null;
}
buffer.flip();
int id = buffer.getInt();
byte inUseFlag = buffer.get();
boolean inUse = false;
if ( (inUseFlag & Record.IN_USE.byteValue()) ==
Record.IN_USE.byteValue() )
{
inUse = true;
}
else if ( inUseFlag != Record.NOT_IN_USE.byteValue() )
{
throw new IOException( "Illegal in use flag: " + inUseFlag );
}
RelationshipTypeRecord record = new RelationshipTypeRecord( id );
record.setInUse( inUse );
record.setNameId( buffer.getInt() );
int nrTypeRecords = buffer.getInt();
for ( int i = 0; i < nrTypeRecords; i++ )
{
DynamicRecord dr = readDynamicRecord( byteChannel, buffer );
if ( dr == null )
{
return null;
}
record.addNameRecord( dr );
}
return new RelationshipTypeCommand(
neoStore == null ? null : neoStore.getRelationshipTypeStore(), record );
}
@Override
public boolean equals( Object o )
{
if ( !(o instanceof RelationshipTypeCommand) )
{
return false;
}
return getKey() == ((Command) o).getKey();
}
}
public static Command readCommand( NeoStore neoStore, ReadableByteChannel byteChannel,
ByteBuffer buffer ) throws IOException
{
buffer.clear();
buffer.limit( 1 );
if ( byteChannel.read( buffer ) != buffer.limit() )
{
return null;
}
buffer.flip();
byte commandType = buffer.get();
switch ( commandType )
{
case NODE_COMMAND:
return NodeCommand.readCommand( neoStore, byteChannel, buffer );
case PROP_COMMAND:
return PropertyCommand.readCommand( neoStore, byteChannel,
buffer );
case PROP_INDEX_COMMAND:
return PropertyIndexCommand.readCommand( neoStore, byteChannel,
buffer );
case REL_COMMAND:
return RelationshipCommand.readCommand( neoStore, byteChannel,
buffer );
case REL_TYPE_COMMAND:
return RelationshipTypeCommand.readCommand( neoStore,
byteChannel, buffer );
case NEOSTORE_COMMAND:
return NeoStoreCommand.readCommand( neoStore, byteChannel, buffer );
case NONE: return null;
default:
throw new IOException( "Unknown command type[" + commandType
+ "]" );
}
}
abstract boolean isCreated();
abstract boolean isDeleted();
}
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