org.apache.flume.api
Class AbstractRpcClient

java.lang.Object
  org.apache.flume.api.AbstractRpcClient

All Implemented Interfaces:

RpcClient

Direct Known Subclasses:

FailoverRpcClient, LoadBalancingRpcClient, NettyAvroRpcClient

public abstract class AbstractRpcClient
extends Object
implements RpcClient

Field Summary

protected int	batchSize
protected long	connectTimeout
protected long	requestTimeout

Constructor Summary

AbstractRpcClient()

Method Summary

abstract void	append(Event event) Send a single Event to the associated Flume source.
abstract void	appendBatch(List<Event> events) Send a list of events to the associated Flume source.
abstract void	close() Immediately closes the client so that it may no longer be used.
protected abstract void	configure(Properties properties) Configure the client using the given properties object.
int	getBatchSize() Returns the maximum number of events that may be batched at once by appendBatch().
abstract boolean	isActive() Returns true if this object appears to be in a usable state, and it returns false if this object is permanently disabled.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

batchSize

protected int batchSize

connectTimeout

protected long connectTimeout

requestTimeout

protected long requestTimeout

Constructor Detail

AbstractRpcClient

public AbstractRpcClient()

Method Detail

getBatchSize

public int getBatchSize()

Description copied from interface: RpcClient

Returns the maximum number of events that may be batched at once by appendBatch().

Specified by:

getBatchSize in interface RpcClient

append

public abstract void append(Event event)
                     throws EventDeliveryException

Description copied from interface: RpcClient

Send a single Event to the associated Flume source.

This method blocks until the RPC returns or until the request times out.

Note: If this method throws an EventDeliveryException, there is no way to recover and the application must invoke RpcClient.close() on this object to clean up system resources.

Specified by:

append in interface RpcClient

Throws:

EventDeliveryException - when an error prevents event delivery.

appendBatch

public abstract void appendBatch(List<Event> events)
                          throws EventDeliveryException

Description copied from interface: RpcClient

Send a list of events to the associated Flume source.

This method blocks until the RPC returns or until the request times out.

It is strongly recommended that the number of events in the List be no more than RpcClient.getBatchSize(). If it is more, multiple RPC calls will be required, and the likelihood of duplicate Events being stored will increase.

Note: If this method throws an EventDeliveryException, there is no way to recover and the application must invoke RpcClient.close() on this object to clean up system resources.

Specified by:

appendBatch in interface RpcClient

Parameters:

events - List of events to send

Throws:

EventDeliveryException - when an error prevents event delivery.

isActive

public abstract boolean isActive()

Description copied from interface: RpcClient

Returns true if this object appears to be in a usable state, and it returns false if this object is permanently disabled.

If this method returns false, an application must call RpcClient.close() on this object to clean up system resources.

Specified by:

isActive in interface RpcClient

close

public abstract void close()
                    throws FlumeException

Description copied from interface: RpcClient

Immediately closes the client so that it may no longer be used.

Note: This method MUST be called by applications when they are done using the RPC client in order to clean up resources.

Multi-threaded applications may want to gracefully stop making RPC calls before calling close(). Otherwise, they risk getting EventDeliveryException thrown from their in-flight calls when the underlying connection is disabled.

Specified by:

close in interface RpcClient

Throws:

FlumeException

configure

protected abstract void configure(Properties properties)
                           throws FlumeException

Configure the client using the given properties object.

Parameters:

properties -

Throws:

FlumeException - if the client can not be configured using this method, or if the client was already configured once.