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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 org.apache.pulsar.client.impl;
import java.io.Closeable;
import java.io.IOException;
import java.util.List;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageId;
import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.interceptor.ProducerInterceptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A container that holds the list{@link ProducerInterceptor}
* and wraps calls to the chain of custom interceptors.
*/
public class ProducerInterceptors implements Closeable {
private static final Logger log = LoggerFactory.getLogger(ProducerInterceptors.class);
private final List interceptors;
public ProducerInterceptors(List interceptors) {
this.interceptors = interceptors;
}
/**
* This is called when client sends message to pulsar broker, before key and value gets serialized.
* The method calls {@link ProducerInterceptor#beforeSend(Producer,Message)} method. Message returned from
* first interceptor's beforeSend() is passed to the second interceptor beforeSend(), and so on in the
* interceptor chain. The message returned from the last interceptor is returned from this method.
*
* This method does not throw exceptions. Exceptions thrown by any interceptor methods are caught and ignored.
* If a interceptor in the middle of the chain, that normally modifies the message, throws an exception,
* the next interceptor in the chain will be called with a message returned by the previous interceptor that did
* not throw an exception.
*
* @param producer the producer which contains the interceptor.
* @param message the message from client
* @return the message to send to topic/partition
*/
public Message beforeSend(Producer producer, Message message) {
Message interceptorMessage = message;
for (ProducerInterceptor interceptor : interceptors) {
if (!interceptor.eligible(message)) {
continue;
}
try {
interceptorMessage = interceptor.beforeSend(producer, interceptorMessage);
} catch (Throwable e) {
if (producer != null) {
log.warn("Error executing interceptor beforeSend callback for topicName:{} ",
producer.getTopic(), e);
} else {
log.warn("Error Error executing interceptor beforeSend callback ", e);
}
}
}
return interceptorMessage;
}
/**
* This method is called when the message send to the broker has been acknowledged, or when sending the record fails
* before it gets send to the broker.
* This method calls {@link ProducerInterceptor#onSendAcknowledgement(Producer, Message, MessageId, Throwable)}
* method for each interceptor.
*
* This method does not throw exceptions. Exceptions thrown by any of interceptor methods are caught and ignored.
*
* @param producer the producer which contains the interceptor.
* @param message The message returned from the last interceptor is returned from
* {@link ProducerInterceptor#beforeSend(Producer, Message)}
* @param msgId The message id that broker returned. Null if has error occurred.
* @param exception The exception thrown during processing of this message. Null if no error occurred.
*/
public void onSendAcknowledgement(Producer producer, Message message, MessageId msgId, Throwable exception) {
for (ProducerInterceptor interceptor : interceptors) {
if (!interceptor.eligible(message)) {
continue;
}
try {
interceptor.onSendAcknowledgement(producer, message, msgId, exception);
} catch (Throwable e) {
log.warn("Error executing interceptor onSendAcknowledgement callback ", e);
}
}
}
public void onPartitionsChange(String topicName, int partitions) {
for (ProducerInterceptor interceptor : interceptors) {
try {
interceptor.onPartitionsChange(topicName, partitions);
} catch (Throwable e) {
log.warn("Error executing interceptor onPartitionsChange callback ", e);
}
}
}
@Override
public void close() throws IOException {
for (ProducerInterceptor interceptor : interceptors) {
try {
interceptor.close();
} catch (Throwable e) {
log.error("Fail to close producer interceptor ", e);
}
}
}
}
