LogAppender (Nuxeo 2021.64.6 API Documentation)

All Known Subinterfaces:

CloseableLogAppender<M>

All Known Implementing Classes:

ChronicleLogAppender, KafkaLogAppender
```
public interface LogAppender<M extends Externalizable>
```
An appender is used to append message into a Log. Implementations must be thread safe.

Since:

9.3

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`LogOffset`	`append(int partition, M message)`	Append a message into a partition, returns `LogOffset` position of the message.
`default LogOffset`	`append(String key, M message)`	Same as `append(int, Externalizable)`, the queue is chosen using a hash of parameters "key".
`boolean`	`closed()`	Returns `true` if the appender has been closed by the manager.
`Codec<M>`	`getCodec()`	Returns the codec used to write record.
`Name`	`name()`	Returns the Log's name.
`int`	`size()`	Returns the number of partitions in the Log.
`boolean`	`waitFor(LogOffset offset, Name group, Duration timeout)`	Wait for consumer to process a message up to the offset.

- Method Detail
  - name
```
Name name()
```
    Returns the Log's name.
  - size
```
int size()
```
    Returns the number of partitions in the Log.
  - append
```
LogOffset append(int partition,
                 M message)
```
    Append a message into a partition, returns LogOffset position of the message. This method is thread safe, a queue can be shared by multiple producers.
    
    Parameters:
    
    partition - index lower than size()
  - append
```
default LogOffset append(String key,
                         M message)
```
    Same as append(int, Externalizable), the queue is chosen using a hash of parameters "key".
  - waitFor
```
boolean waitFor(LogOffset offset,
                Name group,
                Duration timeout)
         throws InterruptedException
```
    Wait for consumer to process a message up to the offset. The message is processed if a consumer of the group commits a greater or equals offset. Return true if the message has been consumed, false in case of timeout.
    
    Throws:
    
    InterruptedException
  - closed
```
boolean closed()
```
    Returns true if the appender has been closed by the manager.
  - getCodec
```
Codec<M> getCodec()
```
    Returns the codec used to write record. A null codec is the default legacy encoding.
    
    Since:
    
    10.2