kafka ForwardingDisabledProcessorContext 源码
kafka ForwardingDisabledProcessorContext 代码
文件路径:/streams/src/main/java/org/apache/kafka/streams/processor/internals/ForwardingDisabledProcessorContext.java
/*
* 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 org.apache.kafka.streams.processor.internals;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.streams.StreamsMetrics;
import org.apache.kafka.streams.errors.StreamsException;
import org.apache.kafka.streams.processor.Cancellable;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.PunctuationType;
import org.apache.kafka.streams.processor.Punctuator;
import org.apache.kafka.streams.processor.StateRestoreCallback;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.processor.TaskId;
import org.apache.kafka.streams.processor.To;
import java.io.File;
import java.time.Duration;
import java.util.Map;
import java.util.Objects;
/**
* {@code ProcessorContext} implementation that will throw on any forward call.
*/
public final class ForwardingDisabledProcessorContext implements ProcessorContext {
private final ProcessorContext delegate;
private static final String EXPLANATION = "ProcessorContext#forward() is not supported from this context, "
+ "as the framework must ensure the key is not changed (#forward allows changing the key on "
+ "messages which are sent). Try another function, which doesn't allow the key to be changed "
+ "(for example - #tranformValues).";
public ForwardingDisabledProcessorContext(final ProcessorContext delegate) {
this.delegate = Objects.requireNonNull(delegate, "delegate");
}
@Override
public String applicationId() {
return delegate.applicationId();
}
@Override
public TaskId taskId() {
return delegate.taskId();
}
@Override
public Serde<?> keySerde() {
return delegate.keySerde();
}
@Override
public Serde<?> valueSerde() {
return delegate.valueSerde();
}
@Override
public File stateDir() {
return delegate.stateDir();
}
@Override
public StreamsMetrics metrics() {
return delegate.metrics();
}
@Override
public void register(final StateStore store,
final StateRestoreCallback stateRestoreCallback) {
delegate.register(store, stateRestoreCallback);
}
@Override
public <S extends StateStore> S getStateStore(final String name) {
return delegate.getStateStore(name);
}
@Override
public Cancellable schedule(final Duration interval,
final PunctuationType type,
final Punctuator callback) throws IllegalArgumentException {
return delegate.schedule(interval, type, callback);
}
@Override
public <K, V> void forward(final K key, final V value) {
throw new StreamsException(EXPLANATION);
}
@Override
public <K, V> void forward(final K key, final V value, final To to) {
throw new StreamsException(EXPLANATION);
}
@Override
public void commit() {
delegate.commit();
}
@Override
public String topic() {
return delegate.topic();
}
@Override
public int partition() {
return delegate.partition();
}
@Override
public long offset() {
return delegate.offset();
}
@Override
public Headers headers() {
return delegate.headers();
}
@Override
public long timestamp() {
return delegate.timestamp();
}
@Override
public Map<String, Object> appConfigs() {
return delegate.appConfigs();
}
@Override
public Map<String, Object> appConfigsWithPrefix(final String prefix) {
return delegate.appConfigsWithPrefix(prefix);
}
@Override
public long currentSystemTimeMs() {
return delegate.currentSystemTimeMs();
}
@Override
public long currentStreamTimeMs() {
return delegate.currentStreamTimeMs();
}
}
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