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Refactor Raft command requests to ensure consistency across requests …
…by sharing a base type.
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167 changes: 167 additions & 0 deletions
167
raft/src/main/java/net/kuujo/copycat/protocol/raft/rpc/CommandRequest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| /* | ||
| * 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.protocol.raft.rpc; | ||
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| import net.kuujo.copycat.io.Buffer; | ||
| import net.kuujo.copycat.io.util.ReferenceManager; | ||
|
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| import java.util.Objects; | ||
| import java.util.function.Function; | ||
|
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| /** | ||
| * Protocol command request. | ||
| * | ||
| * @author <a href="http://github.com/kuujo">Jordan Halterman</a> | ||
| */ | ||
| public abstract class CommandRequest<REQUEST extends CommandRequest<REQUEST>> extends AbstractRequest<REQUEST> { | ||
| protected Buffer key; | ||
| protected Buffer entry; | ||
|
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| public CommandRequest(ReferenceManager<REQUEST> referenceManager) { | ||
| super(referenceManager); | ||
| } | ||
|
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| /** | ||
| * Returns the command key. | ||
| * | ||
| * @return The command key. | ||
| */ | ||
| public Buffer key() { | ||
| return key; | ||
| } | ||
|
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| /** | ||
| * Returns the command entry. | ||
| * | ||
| * @return The command entry. | ||
| */ | ||
| public Buffer entry() { | ||
| return entry; | ||
| } | ||
|
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| @Override | ||
| public void readObject(Buffer buffer) { | ||
| int keySize = buffer.readInt(); | ||
| if (keySize > -1) { | ||
| key = buffer.slice(keySize); | ||
| buffer.skip(keySize); | ||
| } | ||
| int entrySize = buffer.readInt(); | ||
| entry = buffer.slice(entrySize); | ||
| } | ||
|
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| @Override | ||
| public void writeObject(Buffer buffer) { | ||
| if (key != null) { | ||
| buffer.writeInt((int) key.limit()).write(key); | ||
| } else { | ||
| buffer.writeInt(-1); | ||
| } | ||
| buffer.writeInt((int) entry.limit()).write(entry); | ||
| } | ||
|
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| @Override | ||
| public void close() { | ||
| if (key != null) | ||
| key.release(); | ||
| if (entry != null) | ||
| entry.release(); | ||
| super.close(); | ||
| } | ||
|
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(entry); | ||
| } | ||
|
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| @Override | ||
| public boolean equals(Object object) { | ||
| if (object instanceof CommandRequest) { | ||
| CommandRequest request = (CommandRequest) object; | ||
| return ((request.key == null && key == null) || (request.key != null && key != null && request.key.equals(key))) | ||
| && request.entry.equals(entry); | ||
| } | ||
| return false; | ||
| } | ||
|
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| @Override | ||
| public String toString() { | ||
| return String.format("%s[entry=%s]", getClass().getSimpleName(), entry.toString()); | ||
| } | ||
|
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| /** | ||
| * Write request builder. | ||
| */ | ||
| public static abstract class Builder<BUILDER extends Builder<BUILDER, REQUEST>, REQUEST extends CommandRequest<REQUEST>> extends AbstractRequest.Builder<BUILDER, REQUEST> { | ||
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| protected Builder(Function<ReferenceManager<REQUEST>, REQUEST> factory) { | ||
| super(factory); | ||
| } | ||
|
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| /** | ||
| * Sets the request key. | ||
| * | ||
| * @param key The request key. | ||
| * @return The request builder. | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public BUILDER withKey(Buffer key) { | ||
| request.key = key; | ||
| return (BUILDER) this; | ||
| } | ||
|
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| /** | ||
| * Sets the request entry. | ||
| * | ||
| * @param entry The request entry. | ||
| * @return The request builder. | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public BUILDER withEntry(Buffer entry) { | ||
| if (entry == null) | ||
| throw new NullPointerException("entry cannot be null"); | ||
| request.entry = entry; | ||
| return (BUILDER) this; | ||
| } | ||
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| @Override | ||
| public REQUEST build() { | ||
| super.build(); | ||
| if (request.key != null) | ||
| request.key.acquire(); | ||
| if (request.entry != null) | ||
| request.entry.acquire(); | ||
| return request; | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(request); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object object) { | ||
| return object instanceof Builder && ((Builder) object).request.equals(request); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return String.format("%s[request=%s]", getClass().getCanonicalName(), request); | ||
| } | ||
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| } | ||
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| } |
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