KafkaTridentSpoutBatchMetadata (Storm 2.7.1 API)

java.lang.Object
- org.apache.storm.kafka.spout.trident.KafkaTridentSpoutBatchMetadata

All Implemented Interfaces:

Serializable
```
public class KafkaTridentSpoutBatchMetadata
extends Object
implements Serializable
```
Wraps transaction batch information.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static String FIRST_OFFSET_KEY

static String LAST_OFFSET_KEY

static String TOPOLOGY_ID_KEY

Constructor Summary

Constructors
Constructor	Description
`KafkaTridentSpoutBatchMetadata(long firstOffset, long lastOffset, String topologyId)`	Builds a metadata object.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static KafkaTridentSpoutBatchMetadata`	`fromMap(Map<String,Object> map)`	Constructs a metadata object from a Map in the format produced by `toMap()`.
`long`	`getFirstOffset()`
`long`	`getLastOffset()`
`String`	`getTopologyId()`
`Map<String,Object>`	`toMap()`	Writes this metadata object to a Map so Trident can read/write it to Zookeeper.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - FIRST_OFFSET_KEY
```
public static final String FIRST_OFFSET_KEY
```
    See Also:
    
    Constant Field Values
  - LAST_OFFSET_KEY
```
public static final String LAST_OFFSET_KEY
```
    See Also:
    
    Constant Field Values
  - TOPOLOGY_ID_KEY
```
public static final String TOPOLOGY_ID_KEY
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - KafkaTridentSpoutBatchMetadata
```
public KafkaTridentSpoutBatchMetadata(long firstOffset,
                                      long lastOffset,
                                      String topologyId)
```
    Builds a metadata object.
    
    Parameters:
    
    firstOffset - The first offset for the batch
    
    lastOffset - The last offset for the batch
- Method Detail
  - getFirstOffset
```
public long getFirstOffset()
```
  - getLastOffset
```
public long getLastOffset()
```
  - getTopologyId
```
public String getTopologyId()
```
  - fromMap
```
public static KafkaTridentSpoutBatchMetadata fromMap(Map<String,Object> map)
```
    Constructs a metadata object from a Map in the format produced by toMap().
    
    Parameters:
    
    map - The source map
    
    Returns:
    
    A new metadata object
  - toMap
```
public Map<String,Object> toMap()
```
    Writes this metadata object to a Map so Trident can read/write it to Zookeeper.
  - toString
```
public final String toString()
```
    Overrides:
    
    toString in class Object