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/*
* Copyright 2018-2020 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
*
* https://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.springframework.data.redis.stream;
import lombok.EqualsAndHashCode;
import lombok.RequiredArgsConstructor;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.function.BiFunction;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.stream.Consumer;
import org.springframework.data.redis.connection.stream.ReadOffset;
import org.springframework.data.redis.connection.stream.Record;
import org.springframework.data.redis.connection.stream.StreamOffset;
import org.springframework.data.redis.connection.stream.StreamReadOptions;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StreamOperations;
import org.springframework.util.Assert;
import org.springframework.util.ErrorHandler;
/**
* Simple {@link Executor} based {@link StreamMessageListenerContainer} implementation for running {@link Task tasks} to
* poll on Redis Streams.
*
* This message container creates long-running tasks that are executed on {@link Executor}.
*
* @author Mark Paluch
* @author Christoph Strobl
* @since 2.2
*/
class DefaultStreamMessageListenerContainer> implements StreamMessageListenerContainer {
private final Object lifecycleMonitor = new Object();
private final Executor taskExecutor;
private final ErrorHandler errorHandler;
private final StreamReadOptions readOptions;
private final RedisTemplate template;
private final StreamOperations streamOperations;
private final StreamMessageListenerContainerOptions containerOptions;
private final List subscriptions = new ArrayList<>();
private boolean running = false;
/**
* Create a new {@link DefaultStreamMessageListenerContainer}.
*
* @param connectionFactory must not be {@literal null}.
* @param containerOptions must not be {@literal null}.
*/
DefaultStreamMessageListenerContainer(RedisConnectionFactory connectionFactory,
StreamMessageListenerContainerOptions containerOptions) {
Assert.notNull(connectionFactory, "RedisConnectionFactory must not be null!");
Assert.notNull(containerOptions, "StreamMessageListenerContainerOptions must not be null!");
this.taskExecutor = containerOptions.getExecutor();
this.errorHandler = containerOptions.getErrorHandler();
this.readOptions = getStreamReadOptions(containerOptions);
this.template = createRedisTemplate(connectionFactory, containerOptions);
this.containerOptions = containerOptions;
if (containerOptions.getHashMapper() != null) {
this.streamOperations = this.template.opsForStream(containerOptions.getHashMapper());
} else {
this.streamOperations = this.template.opsForStream();
}
}
private static StreamReadOptions getStreamReadOptions(StreamMessageListenerContainerOptions options) {
StreamReadOptions readOptions = StreamReadOptions.empty();
if (options.getBatchSize().isPresent()) {
readOptions = readOptions.count(options.getBatchSize().getAsInt());
}
if (!options.getPollTimeout().isZero()) {
readOptions = readOptions.block(options.getPollTimeout());
}
return readOptions;
}
private RedisTemplate createRedisTemplate(RedisConnectionFactory connectionFactory,
StreamMessageListenerContainerOptions containerOptions) {
RedisTemplate template = new RedisTemplate<>();
template.setKeySerializer(containerOptions.getKeySerializer());
template.setValueSerializer(containerOptions.getKeySerializer());
template.setHashKeySerializer(containerOptions.getHashKeySerializer());
template.setHashValueSerializer(containerOptions.getHashValueSerializer());
template.setConnectionFactory(connectionFactory);
template.afterPropertiesSet();
return template;
}
/*
* (non-Javadoc)
* @see org.springframework.context.SmartLifecycle#isAutoStartup()
*/
@Override
public boolean isAutoStartup() {
return false;
}
/*
* (non-Javadoc)
* @see org.springframework.context.SmartLifecycle#stop(java.lang.Runnable)
*/
@Override
public void stop(Runnable callback) {
stop();
callback.run();
}
/*
* (non-Javadoc)
* @see org.springframework.context.Lifecycle#start()
*/
@Override
public void start() {
synchronized (lifecycleMonitor) {
if (this.running) {
return;
}
subscriptions.stream() //
.filter(it -> !it.isActive()) //
.filter(it -> it instanceof TaskSubscription) //
.map(TaskSubscription.class::cast) //
.map(TaskSubscription::getTask) //
.forEach(taskExecutor::execute);
running = true;
}
}
/*
* (non-Javadoc)
* @see org.springframework.context.Lifecycle#stop()
*/
@Override
public void stop() {
synchronized (lifecycleMonitor) {
if (this.running) {
subscriptions.forEach(Cancelable::cancel);
running = false;
}
}
}
/*
* (non-Javadoc)
* @see org.springframework.context.Lifecycle#isRunning()
*/
@Override
public boolean isRunning() {
synchronized (this.lifecycleMonitor) {
return running;
}
}
/*
* (non-Javadoc)
* @see org.springframework.context.Phased#getPhase()
*/
@Override
public int getPhase() {
return Integer.MAX_VALUE;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.stream.StreamMessageListenerContainer#register(org.springframework.data.redis.stream.StreamMessageListenerContainer.StreamReadRequest, org.springframework.data.redis.stream.StreamListener)
*/
@Override
public Subscription register(StreamReadRequest streamRequest, StreamListener listener) {
return doRegister(getReadTask(streamRequest, listener));
}
@SuppressWarnings("unchecked")
private StreamPollTask getReadTask(StreamReadRequest streamRequest, StreamListener listener) {
BiFunction>> readFunction = getReadFunction(streamRequest);
return new StreamPollTask<>(streamRequest, listener, errorHandler, (BiFunction) readFunction);
}
@SuppressWarnings("unchecked")
private BiFunction>> getReadFunction(StreamReadRequest streamRequest) {
if (streamRequest instanceof StreamMessageListenerContainer.ConsumerStreamReadRequest) {
ConsumerStreamReadRequest consumerStreamRequest = (ConsumerStreamReadRequest) streamRequest;
StreamReadOptions readOptions = consumerStreamRequest.isAutoAcknowledge() ? this.readOptions.autoAcknowledge()
: this.readOptions;
Consumer consumer = consumerStreamRequest.getConsumer();
if (this.containerOptions.getHashMapper() != null) {
return (key, offset) -> streamOperations.read(this.containerOptions.getTargetType(), consumer, readOptions,
StreamOffset.create(key, offset));
}
return (key, offset) -> streamOperations.read(consumer, readOptions, StreamOffset.create(key, offset));
}
if (this.containerOptions.getHashMapper() != null) {
return (key, offset) -> streamOperations.read(this.containerOptions.getTargetType(), readOptions,
StreamOffset.create(key, offset));
}
return (key, offset) -> streamOperations.read(readOptions, StreamOffset.create(key, offset));
}
private Subscription doRegister(Task task) {
Subscription subscription = new TaskSubscription(task);
synchronized (lifecycleMonitor) {
this.subscriptions.add(subscription);
if (this.running) {
taskExecutor.execute(task);
}
}
return subscription;
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.monitor.MessageListenerContainer#remove(org.springframework.data.mongodb.monitor.Subscription)
*/
@Override
public void remove(Subscription subscription) {
synchronized (lifecycleMonitor) {
if (subscriptions.contains(subscription)) {
if (subscription.isActive()) {
subscription.cancel();
}
subscriptions.remove(subscription);
}
}
}
/**
* {@link Subscription} wrapping a {@link Task}.
*
* @author Mark Paluch
* @since 2.2
*/
@EqualsAndHashCode
@RequiredArgsConstructor
static class TaskSubscription implements Subscription {
private final Task task;
Task getTask() {
return task;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.stream.Subscription#isActive()
*/
@Override
public boolean isActive() {
return task.isActive();
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.stream.Subscription#await(java.time.Duration)
*/
@Override
public boolean await(Duration timeout) throws InterruptedException {
return task.awaitStart(timeout);
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.stream.Cancelable#cancel()
*/
@Override
public void cancel() throws DataAccessResourceFailureException {
task.cancel();
}
}
/**
* Logging {@link ErrorHandler}.
*
* @author Mark Paluch
* @since 2.2
*/
enum LoggingErrorHandler implements ErrorHandler {
INSTANCE;
private final Log logger;
LoggingErrorHandler() {
this.logger = LogFactory.getLog(LoggingErrorHandler.class);
}
/*
* (non-Javadoc)
* @see org.springframework.util.ErrorHandler#handleError(java.lang.Throwable)
*/
public void handleError(Throwable t) {
if (this.logger.isErrorEnabled()) {
this.logger.error("Unexpected error occurred in scheduled task.", t);
}
}
}
}