SpringKafka生产端配置类ProducerConfig.java源码

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  * 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
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  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
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 package org.apache.kafka.clients.producer;

 import org.apache.kafka.clients.CommonClientConfigs;
 import org.apache.kafka.clients.producer.internals.DefaultPartitioner;
 import org.apache.kafka.common.config.AbstractConfig;
 import org.apache.kafka.common.config.ConfigDef;
 import org.apache.kafka.common.config.ConfigDef.Importance;
 import org.apache.kafka.common.config.ConfigDef.Type;
 import org.apache.kafka.common.serialization.Serializer;

 import java.util.HashMap;
 import java.util.Map;
 import java.util.Properties;

 import static org.apache.kafka.common.config.ConfigDef.Range.atLeast;
 import static org.apache.kafka.common.config.ConfigDef.Range.between;
 import static org.apache.kafka.common.config.ConfigDef.ValidString.in;

 /**
  * Configuration for the Kafka Producer. Documentation for these configurations can be found in the <a
  * href="http://kafka.apache.org/documentation.html#newproducerconfigs">Kafka documentation</a>
  */
 public class ProducerConfig extends AbstractConfig {

     /*
      * NOTE: DO NOT CHANGE EITHER CONFIG STRINGS OR THEIR JAVA VARIABLE NAMES AS THESE ARE PART OF THE PUBLIC API AND
      * CHANGE WILL BREAK USER CODE.
      */

     private static final ConfigDef CONFIG;

     /** <code>bootstrap.servers</code> */
     public static final String BOOTSTRAP_SERVERS_CONFIG = CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG;

     /** <code>metadata.fetch.timeout.ms</code> */
     /**
      * @deprecated This config will be removed in a future release. Please use {@link #MAX_BLOCK_MS_CONFIG}
      */
     @Deprecated
     public static final String METADATA_FETCH_TIMEOUT_CONFIG = "metadata.fetch.timeout.ms";
     private static final String METADATA_FETCH_TIMEOUT_DOC = "The first time data is sent to a topic we must fetch metadata about that topic to know which servers host the topic's partitions. This "
                                                              + "fetch to succeed before throwing an exception back to the client.";

     /** <code>metadata.max.age.ms</code> */
     public static final String METADATA_MAX_AGE_CONFIG = CommonClientConfigs.METADATA_MAX_AGE_CONFIG;
     private static final String METADATA_MAX_AGE_DOC = CommonClientConfigs.METADATA_MAX_AGE_DOC;

     /** <code>batch.size</code> */
     public static final String BATCH_SIZE_CONFIG = "batch.size";
     private static final String BATCH_SIZE_DOC = "The producer will attempt to batch records together into fewer requests whenever multiple records are being sent" + " to the same partition. This helps performance on both the client and the server. This configuration controls the "
                                                  + "default batch size in bytes. "
                                                  + "<p>"
                                                  + "No attempt will be made to batch records larger than this size. "
                                                  + "<p>"
                                                  + "Requests sent to brokers will contain multiple batches, one for each partition with data available to be sent. "
                                                  + "<p>"
                                                  + "A small batch size will make batching less common and may reduce throughput (a batch size of zero will disable "
                                                  + "batching entirely). A very large batch size may use memory a bit more wastefully as we will always allocate a "
                                                  + "buffer of the specified batch size in anticipation of additional records.";

     /** <code>buffer.memory</code> */
     public static final String BUFFER_MEMORY_CONFIG = "buffer.memory";
     private static final String BUFFER_MEMORY_DOC = "The total bytes of memory the producer can use to buffer records waiting to be sent to the server. If records are " + "sent faster than they can be delivered to the server the producer will either block or throw an exception based "
                                                     + "on the preference specified by <code>block.on.buffer.full</code>. "
                                                     + "<p>"
                                                     + "This setting should correspond roughly to the total memory the producer will use, but is not a hard bound since "
                                                     + "not all memory the producer uses is used for buffering. Some additional memory will be used for compression (if "
                                                     + "compression is enabled) as well as for maintaining in-flight requests.";

     /** <code>acks</code> */
     public static final String ACKS_CONFIG = "acks";
     private static final String ACKS_DOC = "The number of acknowledgments the producer requires the leader to have received before considering a request complete. This controls the "
                                            + " durability of records that are sent. The following settings are common: "
                                            + " <ul>"
                                            + " <li><code>acks=0</code> If set to zero then the producer will not wait for any acknowledgment from the"
                                            + " server at all. The record will be immediately added to the socket buffer and considered sent. No guarantee can be"
                                            + " made that the server has received the record in this case, and the <code>retries</code> configuration will not"
                                            + " take effect (as the client won't generally know of any failures). The offset given back for each record will"
                                            + " always be set to -1."
                                            + " <li><code>acks=1</code> This will mean the leader will write the record to its local log but will respond"
                                            + " without awaiting full acknowledgement from all followers. In this case should the leader fail immediately after"
                                            + " acknowledging the record but before the followers have replicated it then the record will be lost."
                                            + " <li><code>acks=all</code> This means the leader will wait for the full set of in-sync replicas to"
                                            + " acknowledge the record. This guarantees that the record will not be lost as long as at least one in-sync replica"
                                            + " remains alive. This is the strongest available guarantee.";

     /** <code>timeout.ms</code> */

     /**
      * @deprecated This config will be removed in a future release. Please use {@link #REQUEST_TIMEOUT_MS_CONFIG}
      */
     @Deprecated
     public static final String TIMEOUT_CONFIG = "timeout.ms";
     private static final String TIMEOUT_DOC = "The configuration controls the maximum amount of time the server will wait for acknowledgments from followers to " + "meet the acknowledgment requirements the producer has specified with the <code>acks</code> configuration. If the "
                                               + "requested number of acknowledgments are not met when the timeout elapses an error will be returned. This timeout "
                                               + "is measured on the server side and does not include the network latency of the request.";

     /** <code>linger.ms</code> */
     public static final String LINGER_MS_CONFIG = "linger.ms";
     private static final String LINGER_MS_DOC = "The producer groups together any records that arrive in between request transmissions into a single batched request. " + "Normally this occurs only under load when records arrive faster than they can be sent out. However in some circumstances the client may want to "
                                                 + "reduce the number of requests even under moderate load. This setting accomplishes this by adding a small amount "
                                                 + "of artificial delay&mdash;that is, rather than immediately sending out a record the producer will wait for up to "
                                                 + "the given delay to allow other records to be sent so that the sends can be batched together. This can be thought "
                                                 + "of as analogous to Nagle's algorithm in TCP. This setting gives the upper bound on the delay for batching: once "
                                                 + "we get <code>batch.size</code> worth of records for a partition it will be sent immediately regardless of this "
                                                 + "setting, however if we have fewer than this many bytes accumulated for this partition we will 'linger' for the "
                                                 + "specified time waiting for more records to show up. This setting defaults to 0 (i.e. no delay). Setting <code>linger.ms=5</code>, "
                                                 + "for example, would have the effect of reducing the number of requests sent but would add up to 5ms of latency to records sent in the absense of load.";

     /** <code>client.id</code> */
     public static final String CLIENT_ID_CONFIG = CommonClientConfigs.CLIENT_ID_CONFIG;

     /** <code>send.buffer.bytes</code> */
     public static final String SEND_BUFFER_CONFIG = CommonClientConfigs.SEND_BUFFER_CONFIG;

     /** <code>receive.buffer.bytes</code> */
     public static final String RECEIVE_BUFFER_CONFIG = CommonClientConfigs.RECEIVE_BUFFER_CONFIG;

     /** <code>max.request.size</code> */
     public static final String MAX_REQUEST_SIZE_CONFIG = "max.request.size";
     private static final String MAX_REQUEST_SIZE_DOC = "The maximum size of a request. This is also effectively a cap on the maximum record size. Note that the server " + "has its own cap on record size which may be different from this. This setting will limit the number of record "
                                                        + "batches the producer will send in a single request to avoid sending huge requests.";

     /** <code>reconnect.backoff.ms</code> */
     public static final String RECONNECT_BACKOFF_MS_CONFIG = CommonClientConfigs.RECONNECT_BACKOFF_MS_CONFIG;

     /** <code>block.on.buffer.full</code> */
     /**
      * @deprecated This config will be removed in a future release. Also, the {@link #METADATA_FETCH_TIMEOUT_CONFIG} is no longer honored when this property is set to true.
      */
     @Deprecated
     public static final String BLOCK_ON_BUFFER_FULL_CONFIG = "block.on.buffer.full";
     private static final String BLOCK_ON_BUFFER_FULL_DOC = "When our memory buffer is exhausted we must either stop accepting new records (block) or throw errors. By default " + "this setting is true and we block, however in some scenarios blocking is not desirable and it is better to "
                                                            + "immediately give an error. Setting this to <code>false</code> will accomplish that: the producer will throw a BufferExhaustedException if a recrord is sent and the buffer space is full.";

     /** <code>retries</code> */
     public static final String RETRIES_CONFIG = "retries";
     private static final String RETRIES_DOC = "Setting a value greater than zero will cause the client to resend any record whose send fails with a potentially transient error." + " Note that this retry is no different than if the client resent the record upon receiving the "
                                               + "error. Allowing retries will potentially change the ordering of records because if two records are "
                                               + "sent to a single partition, and the first fails and is retried but the second succeeds, then the second record "
                                               + "may appear first.";

     /** <code>retry.backoff.ms</code> */
     public static final String RETRY_BACKOFF_MS_CONFIG = CommonClientConfigs.RETRY_BACKOFF_MS_CONFIG;

     /** <code>compression.type</code> */
     public static final String COMPRESSION_TYPE_CONFIG = "compression.type";
     private static final String COMPRESSION_TYPE_DOC = "The compression type for all data generated by the producer. The default is none (i.e. no compression). Valid " + " values are <code>none</code>, <code>gzip</code>, <code>snappy</code>, or <code>lz4</code>. "
                                                        + "Compression is of full batches of data, so the efficacy of batching will also impact the compression ratio (more batching means better compression).";

     /** <code>metrics.sample.window.ms</code> */
     public static final String METRICS_SAMPLE_WINDOW_MS_CONFIG = CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_CONFIG;

     /** <code>metrics.num.samples</code> */
     public static final String METRICS_NUM_SAMPLES_CONFIG = CommonClientConfigs.METRICS_NUM_SAMPLES_CONFIG;

     /** <code>metric.reporters</code> */
     public static final String METRIC_REPORTER_CLASSES_CONFIG = CommonClientConfigs.METRIC_REPORTER_CLASSES_CONFIG;

     /** <code>max.in.flight.requests.per.connection</code> */
     public static final String MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION = "max.in.flight.requests.per.connection";
     private static final String MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION_DOC = "The maximum number of unacknowledged requests the client will send on a single connection before blocking."
                                                                             + " Note that if this setting is set to be greater than 1 and there are failed sends, there is a risk of"
                                                                             + " message re-ordering due to retries (i.e., if retries are enabled).";

     /** <code>key.serializer</code> */
     public static final String KEY_SERIALIZER_CLASS_CONFIG = "key.serializer";
     public static final String KEY_SERIALIZER_CLASS_DOC = "Serializer class for key that implements the <code>Serializer</code> interface.";

     /** <code>value.serializer</code> */
     public static final String VALUE_SERIALIZER_CLASS_CONFIG = "value.serializer";
     public static final String VALUE_SERIALIZER_CLASS_DOC = "Serializer class for value that implements the <code>Serializer</code> interface.";

     /** <code>connections.max.idle.ms</code> */
     public static final String CONNECTIONS_MAX_IDLE_MS_CONFIG = CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_CONFIG;

     /** <code>partitioner.class</code> */
     public static final String PARTITIONER_CLASS_CONFIG = "partitioner.class";
     private static final String PARTITIONER_CLASS_DOC = "Partitioner class that implements the <code>Partitioner</code> interface.";

     /** <code>max.block.ms</code> */
     public static final String MAX_BLOCK_MS_CONFIG = "max.block.ms";
     private static final String MAX_BLOCK_MS_DOC = "The configuration controls how long {@link KafkaProducer#send()} and {@link KafkaProducer#partitionsFor} will block."
                                                     + "These methods can be blocked either because the buffer is full or metadata unavailable."
                                                     + "Blocking in the user-supplied serializers or partitioner will not be counted against this timeout.";

     /** <code>request.timeout.ms</code> */
     public static final String REQUEST_TIMEOUT_MS_CONFIG = CommonClientConfigs.REQUEST_TIMEOUT_MS_CONFIG;
     private static final String REQUEST_TIMEOUT_MS_DOC = CommonClientConfigs.REQUEST_TIMEOUT_MS_DOC;

     static {
         CONFIG = new ConfigDef().define(BOOTSTRAP_SERVERS_CONFIG, Type.LIST, Importance.HIGH, CommonClientConfigs.BOOSTRAP_SERVERS_DOC)
                                 .define(BUFFER_MEMORY_CONFIG, Type.LONG, 32 * 1024 * 1024L, atLeast(0L), Importance.HIGH, BUFFER_MEMORY_DOC)
                                 .define(RETRIES_CONFIG, Type.INT, 0, between(0, Integer.MAX_VALUE), Importance.HIGH, RETRIES_DOC)
                                 .define(ACKS_CONFIG,
                                         Type.STRING,
                                         "1",
                                         in("all", "-1", "0", "1"),
                                         Importance.HIGH,
                                         ACKS_DOC)
                                 .define(COMPRESSION_TYPE_CONFIG, Type.STRING, "none", Importance.HIGH, COMPRESSION_TYPE_DOC)
                                 .define(BATCH_SIZE_CONFIG, Type.INT, 16384, atLeast(0), Importance.MEDIUM, BATCH_SIZE_DOC)
                                 .define(TIMEOUT_CONFIG, Type.INT, 30 * 1000, atLeast(0), Importance.MEDIUM, TIMEOUT_DOC)
                                 .define(LINGER_MS_CONFIG, Type.LONG, 0, atLeast(0L), Importance.MEDIUM, LINGER_MS_DOC)
                                 .define(CLIENT_ID_CONFIG, Type.STRING, "", Importance.MEDIUM, CommonClientConfigs.CLIENT_ID_DOC)
                                 .define(SEND_BUFFER_CONFIG, Type.INT, 128 * 1024, atLeast(0), Importance.MEDIUM, CommonClientConfigs.SEND_BUFFER_DOC)
                                 .define(RECEIVE_BUFFER_CONFIG, Type.INT, 32 * 1024, atLeast(0), Importance.MEDIUM, CommonClientConfigs.RECEIVE_BUFFER_DOC)
                                 .define(MAX_REQUEST_SIZE_CONFIG,
                                         Type.INT,
                                         1 * 1024 * 1024,
                                         atLeast(0),
                                         Importance.MEDIUM,
                                         MAX_REQUEST_SIZE_DOC)
                                 .define(BLOCK_ON_BUFFER_FULL_CONFIG, Type.BOOLEAN, false, Importance.LOW, BLOCK_ON_BUFFER_FULL_DOC)
                                 .define(RECONNECT_BACKOFF_MS_CONFIG, Type.LONG, 50L, atLeast(0L), Importance.LOW, CommonClientConfigs.RECONNECT_BACKOFF_MS_DOC)
                                 .define(METRIC_REPORTER_CLASSES_CONFIG, Type.LIST, "", Importance.LOW, CommonClientConfigs.METRIC_REPORTER_CLASSES_DOC)
                                 .define(RETRY_BACKOFF_MS_CONFIG, Type.LONG, 100L, atLeast(0L), Importance.LOW, CommonClientConfigs.RETRY_BACKOFF_MS_DOC)
                                 .define(METADATA_FETCH_TIMEOUT_CONFIG,
                                         Type.LONG,
                                         60 * 1000,
                                         atLeast(0),
                                         Importance.LOW,
                                         METADATA_FETCH_TIMEOUT_DOC)
                                 .define(MAX_BLOCK_MS_CONFIG,
                                         Type.LONG,
                                         60 * 1000,
                                         atLeast(0),
                                         Importance.MEDIUM,
                                         MAX_BLOCK_MS_DOC)
                                 .define(REQUEST_TIMEOUT_MS_CONFIG,
                                         Type.INT,
                                         30 * 1000,
                                         atLeast(0),
                                         Importance.MEDIUM,
                                         REQUEST_TIMEOUT_MS_DOC)
                                 .define(METADATA_MAX_AGE_CONFIG, Type.LONG, 5 * 60 * 1000, atLeast(0), Importance.LOW, METADATA_MAX_AGE_DOC)
                                 .define(METRICS_SAMPLE_WINDOW_MS_CONFIG,
                                         Type.LONG,
                                         30000,
                                         atLeast(0),
                                         Importance.LOW,
                                         CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_DOC)
                                 .define(METRICS_NUM_SAMPLES_CONFIG, Type.INT, 2, atLeast(1), Importance.LOW, CommonClientConfigs.METRICS_NUM_SAMPLES_DOC)
                                 .define(MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION,
                                         Type.INT,
                                         5,
                                         atLeast(1),
                                         Importance.LOW,
                                         MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION_DOC)
                                 .define(KEY_SERIALIZER_CLASS_CONFIG,
                                         Type.CLASS,
                                         Importance.HIGH,
                                         KEY_SERIALIZER_CLASS_DOC)
                                 .define(VALUE_SERIALIZER_CLASS_CONFIG,
                                         Type.CLASS,
                                         Importance.HIGH,
                                         VALUE_SERIALIZER_CLASS_DOC)
                                 /* default is set to be a bit lower than the server default (10 min), to avoid both client and server closing connection at same time */
                                 .define(CONNECTIONS_MAX_IDLE_MS_CONFIG,
                                         Type.LONG,
                                         9 * 60 * 1000,
                                         Importance.MEDIUM,
                                         CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_DOC)
                                 .define(PARTITIONER_CLASS_CONFIG,
                                         Type.CLASS,
                                         DefaultPartitioner.class.getName(),
                                         Importance.MEDIUM, PARTITIONER_CLASS_DOC)

                                 // security support
                                 .define(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,
                                         Type.STRING,
                                         CommonClientConfigs.DEFAULT_SECURITY_PROTOCOL,
                                         Importance.MEDIUM,
                                         CommonClientConfigs.SECURITY_PROTOCOL_DOC)
                                 .withClientSslSupport()
                                 .withClientSaslSupport();

     }

     public static Map<String, Object> addSerializerToConfig(Map<String, Object> configs,
                                                             Serializer<?> keySerializer, Serializer<?> valueSerializer) {
         Map<String, Object> newConfigs = new HashMap<String, Object>();
         newConfigs.putAll(configs);
         if (keySerializer != null)
             newConfigs.put(KEY_SERIALIZER_CLASS_CONFIG, keySerializer.getClass());
         if (valueSerializer != null)
             newConfigs.put(VALUE_SERIALIZER_CLASS_CONFIG, valueSerializer.getClass());
         return newConfigs;
     }

     public static Properties addSerializerToConfig(Properties properties,
                                                    Serializer<?> keySerializer, Serializer<?> valueSerializer) {
         Properties newProperties = new Properties();
         newProperties.putAll(properties);
         if (keySerializer != null)
             newProperties.put(KEY_SERIALIZER_CLASS_CONFIG, keySerializer.getClass().getName());
         if (valueSerializer != null)
             newProperties.put(VALUE_SERIALIZER_CLASS_CONFIG, valueSerializer.getClass().getName());
         return newProperties;
     }

     ProducerConfig(Map<?, ?> props) {
         super(CONFIG, props);
     }

     public static void main(String[] args) {
         System.out.println(CONFIG.toHtmlTable());
     }

 }