提交 622bbbf0 编写于 作者: qq_28453127's avatar qq_28453127

add some doc of the API_Reference_DefaultMQProducer of English.

上级 df1d93fc
## DefaultMQProducer
---
### Class introduction
`public class DefaultMQProducer
extends ClientConfig
implements MQProducer`
>`DefaultMQProducer` is the entry point for an application to post messages, out of the box,ca quickly create a producer with a no-argument construction. it is mainly responsible for message sending, support synchronous、asynchronous、one-way send. All of these send methods support batch send. The parameters of the sender can be adjusted through the getter/setter methods , provided by this class. `DefaultMQProducer` has multi send method and each method is slightly different. Make sure you know the usage before you use it . Blow is a producer example . [see more examples](https://github.com/apache/rocketmq/blob/master/example/src/main/java/org/apache/rocketmq/example/)。
``` java
public class Producer {
public static void main(String[] args) throws MQClientException {
// create a produce with producer_group_name
DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");
// start the producer
producer.start();
for (int i = 0; i < 128; i++)
try {
// construct the msg
Message msg = new Message("TopicTest",
"TagA",
"OrderID188",
"Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
// send sync
SendResult sendResult = producer.send(msg);
// print the result
System.out.printf("%s%n", sendResult);
} catch (Exception e) {
e.printStackTrace();
}
producer.shutdown();
}
}
```
**Note** : This class is thread safe. It can be safely shared between multiple threads after configuration and startup is complete.
### Variable
|Type|Name| description |
|------|-------|-------|
|DefaultMQProducerImpl|defaultMQProducerImpl|The producer's internal default implementation|
|String|producerGroup|The producer's group|
|String|createTopicKey| Topics that do not exist on the server are automatically created when the message is sent |
|int|defaultTopicQueueNums|The default number of queues to create a topic|
|int|sendMsgTimeout|The timeout for the message to be sent|
|int|compressMsgBodyOverHowmuch|the threshold of the compress of message body|
|int|retryTimesWhenSendFailed|Maximum number of internal attempts to send a message in synchronous mode|
|int|retryTimesWhenSendAsyncFailed|Maximum number of internal attempts to send a message in asynchronous mode|
|boolean|retryAnotherBrokerWhenNotStoreOK|Whether to retry another broker if an internal send fails|
|int|maxMessageSize| Maximum length of message |
|TraceDispatcher|traceDispatcher| Message trackers. Use rcpHook to track messages |
### construction method
|方法名称|方法描述|
|-------|------------|
|DefaultMQProducer()| creates a producer with default parameter values |
|DefaultMQProducer(final String producerGroup)| creates a producer with producer group name. |
|DefaultMQProducer(final String producerGroup, boolean enableMsgTrace)|creates a producer with producer group name and set whether to enable message tracking|
|DefaultMQProducer(final String producerGroup, boolean enableMsgTrace, final String customizedTraceTopic)|creates a producer with producer group name and set whether to enable message tracking、the trace topic.|
|DefaultMQProducer(RPCHook rpcHook)|creates a producer with a rpc hook.|
|DefaultMQProducer(final String producerGroup, RPCHook rpcHook)|creates a producer with a rpc hook and producer group.|
|DefaultMQProducer(final String producerGroup, RPCHook rpcHook, boolean enableMsgTrace,final String customizedTraceTopic)|all of above.|
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