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Renaming to follow the same 'state' naming convention as the IdAlloca…
…tionState and RaftMembershipState.
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99 changes: 99 additions & 0 deletions
99
enterprise/core-edge/src/main/java/org/neo4j/coreedge/raft/state/term/OnDiskTermState.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| * Copyright (c) 2002-2016 "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 Affero 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 Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.coreedge.raft.state.term; | ||
|
|
||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
|
|
||
| import org.neo4j.coreedge.raft.log.RaftStorageException; | ||
| import org.neo4j.io.fs.FileSystemAbstraction; | ||
| import org.neo4j.io.fs.StoreChannel; | ||
| import org.neo4j.kernel.lifecycle.LifecycleAdapter; | ||
|
|
||
| public class OnDiskTermState extends LifecycleAdapter implements TermState | ||
| { | ||
| public static final int TERM_BYTES = 8; | ||
|
|
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| private final StoreChannel channel; | ||
| private long term; | ||
|
|
||
| public OnDiskTermState( FileSystemAbstraction fileSystem, File directory ) | ||
| { | ||
| try | ||
| { | ||
| channel = fileSystem.open( new File( directory, "term.state" ), "rw" ); | ||
| term = readTerm(); | ||
| } | ||
| catch ( IOException e ) | ||
| { | ||
| throw new RuntimeException( e ); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void shutdown() throws Throwable | ||
| { | ||
| channel.force( false ); | ||
| channel.close(); | ||
| } | ||
|
|
||
| @Override | ||
| public long currentTerm() | ||
| { | ||
| return term; | ||
| } | ||
|
|
||
| @Override | ||
| public void update( long newTerm ) throws RaftStorageException | ||
| { | ||
| if ( newTerm < term ) | ||
| { | ||
| throw new IllegalArgumentException( "Cannot move to a lower term" ); | ||
| } | ||
|
|
||
| try | ||
| { | ||
| ByteBuffer buffer = ByteBuffer.allocate( TERM_BYTES ); | ||
| buffer.putLong( newTerm ); | ||
| buffer.flip(); | ||
|
|
||
| channel.writeAll( buffer, 0 ); | ||
| channel.force( false ); | ||
| } | ||
| catch ( IOException e ) | ||
| { | ||
| throw new RaftStorageException( "Failed to update term", e ); | ||
| } | ||
| term = newTerm; | ||
| } | ||
|
|
||
| private long readTerm() throws IOException | ||
| { | ||
| if ( channel.size() < TERM_BYTES ) | ||
| { | ||
| return 0; | ||
| } | ||
| ByteBuffer buffer = ByteBuffer.allocate( TERM_BYTES ); | ||
| channel.read( buffer, 0 ); | ||
| buffer.flip(); | ||
| return buffer.getLong(); | ||
| } | ||
| } |
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107 changes: 107 additions & 0 deletions
107
enterprise/core-edge/src/main/java/org/neo4j/coreedge/raft/state/vote/OnDiskVoteState.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * Copyright (c) 2002-2016 "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 Affero 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 Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.coreedge.raft.state.vote; | ||
|
|
||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
|
|
||
| import io.netty.buffer.ByteBuf; | ||
| import io.netty.buffer.Unpooled; | ||
|
|
||
| import org.neo4j.coreedge.server.CoreMember; | ||
| import org.neo4j.coreedge.raft.log.RaftStorageException; | ||
| import org.neo4j.coreedge.raft.membership.CoreMarshal; | ||
| import org.neo4j.io.fs.FileSystemAbstraction; | ||
| import org.neo4j.io.fs.StoreChannel; | ||
| import org.neo4j.kernel.lifecycle.LifecycleAdapter; | ||
|
|
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| public class OnDiskVoteState extends LifecycleAdapter implements VoteState<CoreMember> | ||
| { | ||
| private final StoreChannel channel; | ||
| private final CoreMarshal coreMemberMarshal = new CoreMarshal(); | ||
| private CoreMember votedFor; | ||
|
|
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| public OnDiskVoteState( FileSystemAbstraction fileSystem, File directory ) | ||
| { | ||
| try | ||
| { | ||
| channel = fileSystem.open( new File( directory, "vote.state" ), "rw" ); | ||
| votedFor = readVote(); | ||
| } | ||
| catch ( IOException e ) | ||
| { | ||
| throw new RuntimeException( e ); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void shutdown() throws Throwable | ||
| { | ||
| channel.force( false ); | ||
| channel.close(); | ||
| } | ||
|
|
||
| @Override | ||
| public CoreMember votedFor() | ||
| { | ||
| return votedFor; | ||
| } | ||
|
|
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| @Override | ||
| public void update( CoreMember votedFor ) throws RaftStorageException | ||
| { | ||
| try | ||
| { | ||
| if ( votedFor == null ) | ||
| { | ||
| channel.truncate( 0 ); | ||
| } | ||
| else | ||
| { | ||
| ByteBuf byteBuf = Unpooled.buffer(); | ||
| coreMemberMarshal.marshal( votedFor, byteBuf ); | ||
| ByteBuffer buffer = byteBuf.nioBuffer(); | ||
|
|
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| channel.writeAll( buffer, 0 ); | ||
| } | ||
| channel.force( false ); | ||
| } | ||
| catch ( IOException e ) | ||
| { | ||
| throw new RaftStorageException( "Failed to update votedFor", e ); | ||
| } | ||
| this.votedFor = votedFor; | ||
| } | ||
|
|
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| private CoreMember readVote() throws IOException | ||
| { | ||
| if ( channel.size() == 0 ) | ||
| { | ||
| return null; | ||
| } | ||
|
|
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| ByteBuffer buffer = ByteBuffer.allocate( (int) channel.size() ); | ||
| channel.read( buffer, 0 ); | ||
| buffer.flip(); | ||
|
|
||
| return coreMemberMarshal.unmarshal( Unpooled.wrappedBuffer( buffer ) ); | ||
| } | ||
| } |
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