DIHWriter (Solr 7.7.0 API)

All Known Implementing Classes:

DIHWriterBase, SolrWriter
```
public interface DIHWriter
```
WARNING: This API is experimental and might change in incompatible ways in the next release.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`close()`	Release resources used by this writer.
`void`	`commit(boolean optimize)`	If this writer supports transactions or commit points, then commit any changes, optionally optimizing the data for read/write performance
`void`	`deleteByQuery(String q)`	Delete from the writer's underlying data store based the passed-in writer-specific query.
`void`	`deleteDoc(Object key)`	Delete from the writer's underlying data store based on the passed-in Primary Key
`void`	`doDeleteAll()`	Delete everything from the writer's underlying data store
`void`	`init(Context context)`	Provide context information for this writer.
`void`	`rollback()`	If this writer supports transactions or commit points, then roll back any uncommitted changes.
`void`	`setDeltaKeys(Set<Map<String,Object>> deltaKeys)`	Specify the keys to be modified by a delta update (required by writers that can store duplicate keys)
`boolean`	`upload(SolrInputDocument doc)`	Add a document to this writer's underlying data store.

- Method Detail
  - commit
```
void commit(boolean optimize)
```
    If this writer supports transactions or commit points, then commit any changes, optionally optimizing the data for read/write performance
  - close
```
void close()
```
    Release resources used by this writer. After calling close, reads & updates will throw exceptions.
  - rollback
```
void rollback()
```
    If this writer supports transactions or commit points, then roll back any uncommitted changes.
  - deleteByQuery
```
void deleteByQuery(String q)
```
    Delete from the writer's underlying data store based the passed-in writer-specific query. (Optional Operation)
  - doDeleteAll
```
void doDeleteAll()
```
    Delete everything from the writer's underlying data store
  - deleteDoc
```
void deleteDoc(Object key)
```
    Delete from the writer's underlying data store based on the passed-in Primary Key
  - upload
```
boolean upload(SolrInputDocument doc)
```
    Add a document to this writer's underlying data store.
    
    Returns:
    
    true on success, false on failure
  - init
```
void init(Context context)
```
    Provide context information for this writer. init() should be called before using the writer.
  - setDeltaKeys
```
void setDeltaKeys(Set<Map<String,Object>> deltaKeys)
```
    Specify the keys to be modified by a delta update (required by writers that can store duplicate keys)