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Add RaftEntry to wrap Raft-specific type/term entry metadata.
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153 changes: 153 additions & 0 deletions
153
raft/src/main/java/net/kuujo/copycat/raft/log/RaftEntry.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,153 @@ | ||
| /* | ||
| * Copyright 2015 the original author or authors. | ||
| * | ||
| * 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. | ||
| */ | ||
| package net.kuujo.copycat.raft.log; | ||
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| import net.kuujo.copycat.util.internal.Assert; | ||
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| import java.nio.ByteBuffer; | ||
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| /** | ||
| * Raft log entry. | ||
| * | ||
| * @author <a href="http://github.com/kuujo">Jordan Halterman</a> | ||
| */ | ||
| public class RaftEntry { | ||
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| /** | ||
| * Raft entry type. | ||
| */ | ||
| public static enum Type { | ||
| CONFIGURATION((byte) 0), | ||
| COMMAND((byte) 1), | ||
| SNAPSHOT((byte) 2); | ||
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| private final byte id; | ||
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| private Type(byte id) { | ||
| this.id = id; | ||
| } | ||
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| /** | ||
| * Returns the entry type ID. | ||
| * | ||
| * @return The entry type ID. | ||
| */ | ||
| public byte id() { | ||
| return id; | ||
| } | ||
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| /** | ||
| * Looks up the type for the given type ID. | ||
| * | ||
| * @param type The type ID for the type to look up. | ||
| * @return The related type. | ||
| */ | ||
| public static Type lookup(byte type) { | ||
| switch (type) { | ||
| case 0: | ||
| return CONFIGURATION; | ||
| case 1: | ||
| return COMMAND; | ||
| default: | ||
| throw new IllegalStateException(); | ||
| } | ||
| } | ||
| } | ||
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| private ByteBuffer buffer; | ||
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| public RaftEntry() { | ||
| } | ||
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| public RaftEntry(ByteBuffer buffer) { | ||
| this.buffer = Assert.notNull(buffer, "buffer"); | ||
| } | ||
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| public RaftEntry(Type type, long term, ByteBuffer entry) { | ||
| buffer = ByteBuffer.allocate(9 + entry.remaining()); | ||
| buffer.put(type.id); | ||
| buffer.putLong(term); | ||
| buffer.put(entry); | ||
| buffer.flip(); | ||
| } | ||
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| /** | ||
| * Returns the entry type. | ||
| * | ||
| * @return The entry type. | ||
| */ | ||
| public Type type() { | ||
| buffer.rewind(); | ||
| return Type.lookup(buffer.get()); | ||
| } | ||
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| /** | ||
| * Returns the entry term. | ||
| * | ||
| * @return The entry term. | ||
| */ | ||
| public long term() { | ||
| buffer.position(1); | ||
| return buffer.getLong(); | ||
| } | ||
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| /** | ||
| * Returns the entry buffer. | ||
| * | ||
| * @return The entry buffer. | ||
| */ | ||
| public ByteBuffer entry() { | ||
| buffer.position(9); | ||
| return buffer.slice(); | ||
| } | ||
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| /** | ||
| * Returns the complete entry buffer size. | ||
| * | ||
| * @return The complete entry buffer size. | ||
| */ | ||
| public int size() { | ||
| return buffer.limit(); | ||
| } | ||
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| /** | ||
| * Returns the entry buffer. | ||
| * | ||
| * @return The entry buffer. | ||
| */ | ||
| public ByteBuffer buffer() { | ||
| buffer.rewind(); | ||
| return buffer; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object object) { | ||
| return object instanceof RaftEntry && ((RaftEntry) object).buffer.equals(buffer); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| int hashCode = 17; | ||
| hashCode = 37 * hashCode + buffer.hashCode(); | ||
| return hashCode; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return String.format("RaftEntry[type=%s, term=%d, entry=%s]", type(), term(), entry()); | ||
| } | ||
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| } |
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