Package org.apache.accumulo.core.client

Interface PluginEnvironment

All Known Subinterfaces:

BalancerEnvironment, ServiceEnvironment

public interface PluginEnvironment

This interface exposes Accumulo system level information to plugins in a stable manner. The purpose of this interface is to insulate plugins from internal refactorings and changes to Accumulo.

Since:

2.1.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	PluginEnvironment.Configuration

Method Summary

Modifier and Type	Method	Description
PluginEnvironment.Configuration	getConfiguration()
PluginEnvironment.Configuration	getConfiguration(TableId tableId)
String	getTableName(TableId tableId)	Many Accumulo plugins are given table IDs as this is what Accumulo uses internally to identify tables.
<T> T	instantiate(String className, Class<T> base)	Instantiate a class using Accumulo's system classloader.
<T> T	instantiate(TableId tableId, String className, Class<T> base)	Instantiate a class using Accumulo's per table classloader.

Method Details

getConfiguration

PluginEnvironment.Configuration getConfiguration()

Returns:

A view of Accumulo's system level configuration. This is backed by system level config in zookeeper, which falls back to site configuration, which falls back to the default configuration.

getConfiguration

PluginEnvironment.Configuration getConfiguration(TableId tableId)

Returns:

a view of a table's configuration. When requesting properties that start with table. the returned configuration may give different values for different tables. For other properties the returned configuration will return the same value as getConfiguration().

getTableName

String getTableName(TableId tableId)
             throws TableNotFoundException

Many Accumulo plugins are given table IDs as this is what Accumulo uses internally to identify tables. If a plugin needs to log debugging information it can call this method to get the table name.

Throws:

TableNotFoundException

instantiate

<T> T instantiate(String className,
 Class<T> base)
           throws ReflectiveOperationException

Instantiate a class using Accumulo's system classloader. The class must have a no argument constructor.

Parameters:

className - Fully qualified name of the class.

base - The expected super type of the class.

Throws:

ReflectiveOperationException

instantiate

<T> T instantiate(TableId tableId,
 String className,
 Class<T> base)
           throws ReflectiveOperationException

Instantiate a class using Accumulo's per table classloader. The class must have a no argument constructor.

Parameters:

className - Fully qualified name of the class.

base - The expected super type of the class.

Throws:

ReflectiveOperationException