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(feat) counter example (sofastack#318)
* (feat) counter example * Add final to fields * (feat) catch exception in GetValueRequestProcessor * (feat)async GetValueRequestProcessor
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jraft-example/src/main/java/com/alipay/sofa/jraft/example/counter/CounterClosure.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You 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 com.alipay.sofa.jraft.example.counter; | ||
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| import com.alipay.sofa.jraft.Closure; | ||
| import com.alipay.sofa.jraft.example.counter.rpc.ValueResponse; | ||
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| /** | ||
| * @author likun ([email protected]) | ||
| */ | ||
| public abstract class CounterClosure implements Closure { | ||
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| private ValueResponse valueResponse; | ||
| private CounterOperation counterOperation; | ||
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| public void setCounterOperation(CounterOperation counterOperation) { | ||
| this.counterOperation = counterOperation; | ||
| } | ||
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| public CounterOperation getCounterOperation() { | ||
| return counterOperation; | ||
| } | ||
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| public ValueResponse getValueResponse() { | ||
| return valueResponse; | ||
| } | ||
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| public void setValueResponse(ValueResponse valueResponse) { | ||
| this.valueResponse = valueResponse; | ||
| } | ||
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| protected void failure(final String errorMsg, final String redirect) { | ||
| final ValueResponse response = new ValueResponse(); | ||
| response.setSuccess(false); | ||
| response.setErrorMsg(errorMsg); | ||
| response.setRedirect(redirect); | ||
| setValueResponse(response); | ||
| } | ||
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| protected void success(final long value) { | ||
| final ValueResponse response = new ValueResponse(); | ||
| response.setValue(value); | ||
| response.setSuccess(true); | ||
| setValueResponse(response); | ||
| } | ||
| } |
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jraft-example/src/main/java/com/alipay/sofa/jraft/example/counter/CounterOperation.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You 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 com.alipay.sofa.jraft.example.counter; | ||
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| import java.io.Serializable; | ||
|
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| /** | ||
| * The counter operation | ||
| * | ||
| * @author likun ([email protected]) | ||
| */ | ||
| public class CounterOperation implements Serializable { | ||
|
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| private static final long serialVersionUID = -6597003954824547294L; | ||
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| /** Get value */ | ||
| public static final byte GET = 0x01; | ||
| /** Increment and get value */ | ||
| public static final byte INCREMENT = 0x02; | ||
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| private byte op; | ||
| private long delta; | ||
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| public static CounterOperation createGet() { | ||
| return new CounterOperation(GET); | ||
| } | ||
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| public static CounterOperation createIncrement(final long delta) { | ||
| return new CounterOperation(INCREMENT, delta); | ||
| } | ||
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| public CounterOperation(byte op) { | ||
| this(op, 0); | ||
| } | ||
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| public CounterOperation(byte op, long delta) { | ||
| this.op = op; | ||
| this.delta = delta; | ||
| } | ||
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| public byte getOp() { | ||
| return op; | ||
| } | ||
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| public long getDelta() { | ||
| return delta; | ||
| } | ||
| } |
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jraft-example/src/main/java/com/alipay/sofa/jraft/example/counter/CounterService.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You 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 com.alipay.sofa.jraft.example.counter; | ||
|
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| /** | ||
| * The counter service supporting query and count function. | ||
| * | ||
| * @author likun ([email protected]) | ||
| */ | ||
| public interface CounterService { | ||
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| /** | ||
| * Get current value from counter | ||
| * | ||
| * Provide consistent reading if {@code readOnlySafe} is true. | ||
| */ | ||
| void get(final boolean readOnlySafe, final CounterClosure closure); | ||
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| /** | ||
| * Add delta to counter then get value | ||
| */ | ||
| void incrementAndGet(final long delta, final CounterClosure closure); | ||
| } |
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jraft-example/src/main/java/com/alipay/sofa/jraft/example/counter/CounterServiceImpl.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You 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 com.alipay.sofa.jraft.example.counter; | ||
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| import java.nio.ByteBuffer; | ||
| import java.util.concurrent.Executor; | ||
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| import org.apache.commons.lang.StringUtils; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import com.alipay.remoting.exception.CodecException; | ||
| import com.alipay.remoting.serialization.SerializerManager; | ||
| import com.alipay.sofa.jraft.Status; | ||
| import com.alipay.sofa.jraft.closure.ReadIndexClosure; | ||
| import com.alipay.sofa.jraft.entity.Task; | ||
| import com.alipay.sofa.jraft.error.RaftError; | ||
| import com.alipay.sofa.jraft.rhea.StoreEngineHelper; | ||
| import com.alipay.sofa.jraft.rhea.options.StoreEngineOptions; | ||
| import com.alipay.sofa.jraft.util.BytesUtil; | ||
|
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| /** | ||
| * @author likun ([email protected]) | ||
| */ | ||
| public class CounterServiceImpl implements CounterService { | ||
| private static final Logger LOG = LoggerFactory.getLogger(CounterServiceImpl.class); | ||
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| private final CounterServer counterServer; | ||
| private final Executor readIndexExecutor; | ||
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| public CounterServiceImpl(CounterServer counterServer) { | ||
| this.counterServer = counterServer; | ||
| this.readIndexExecutor = createReadIndexExecutor(); | ||
| } | ||
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| private Executor createReadIndexExecutor() { | ||
| final StoreEngineOptions opts = new StoreEngineOptions(); | ||
| return StoreEngineHelper.createReadIndexExecutor(opts.getReadIndexCoreThreads()); | ||
| } | ||
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| @Override | ||
| public void get(final boolean readOnlySafe, final CounterClosure closure) { | ||
| if(!readOnlySafe){ | ||
| closure.success(getValue()); | ||
| closure.run(Status.OK()); | ||
| return; | ||
| } | ||
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| this.counterServer.getNode().readIndex(BytesUtil.EMPTY_BYTES, new ReadIndexClosure() { | ||
| @Override | ||
| public void run(Status status, long index, byte[] reqCtx) { | ||
| if(status.isOk()){ | ||
| closure.success(getValue()); | ||
| closure.run(Status.OK()); | ||
| return; | ||
| } | ||
| CounterServiceImpl.this.readIndexExecutor.execute(() -> { | ||
| if(isLeader()){ | ||
| LOG.debug("Fail to get value with 'ReadIndex': {}, try to applying to the state machine.", status); | ||
| applyOperation(CounterOperation.createGet(), closure); | ||
| }else { | ||
| handlerNotLeaderError(closure); | ||
| } | ||
| }); | ||
| } | ||
| }); | ||
| } | ||
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| private boolean isLeader() { | ||
| return this.counterServer.getFsm().isLeader(); | ||
| } | ||
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| private long getValue() { | ||
| return this.counterServer.getFsm().getValue(); | ||
| } | ||
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| private String getRedirect() { | ||
| return this.counterServer.redirect().getRedirect(); | ||
| } | ||
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| @Override | ||
| public void incrementAndGet(final long delta, final CounterClosure closure) { | ||
| applyOperation(CounterOperation.createIncrement(delta), closure); | ||
| } | ||
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| private void applyOperation(final CounterOperation op, final CounterClosure closure) { | ||
| if (!isLeader()) { | ||
| handlerNotLeaderError(closure); | ||
| return; | ||
| } | ||
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| try { | ||
| closure.setCounterOperation(op); | ||
| final Task task = new Task(); | ||
| task.setData(ByteBuffer.wrap(SerializerManager.getSerializer(SerializerManager.Hessian2).serialize(op))); | ||
| task.setDone(closure); | ||
| this.counterServer.getNode().apply(task); | ||
| } catch (CodecException e) { | ||
| String errorMsg = "Fail to encode CounterOperation"; | ||
| LOG.error(errorMsg, e); | ||
| closure.failure(errorMsg, StringUtils.EMPTY); | ||
| closure.run(new Status(RaftError.EINTERNAL, errorMsg)); | ||
| } | ||
| } | ||
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| private void handlerNotLeaderError(final CounterClosure closure) { | ||
| closure.failure("Not leader.", getRedirect()); | ||
| closure.run(new Status(RaftError.EPERM, "Not leader")); | ||
| } | ||
| } |
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