com.netflix.astyanax.connectionpool.impl
Class AbstractExecuteWithFailoverImpl<CL,R>

java.lang.Object
  com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl<CL,R>

Type Parameters:

CL -

R -

All Implemented Interfaces:

ExecuteWithFailover<CL,R>

Direct Known Subclasses:

LeastOutstandingExecuteWithFailover, RoundRobinExecuteWithFailover

public abstract class AbstractExecuteWithFailoverImpl<CL,R>
extends java.lang.Object
implements ExecuteWithFailover<CL,R>

Abstract class that provides a basic impl of ExecuteWithFailover. This is used within the context of a AbstractHostPartitionConnectionPool implementation, where the abstract failover class repeatedly attempts to borrow a connection from the implementing ConnectionPool and also releases the connection as cleanup. It also maintains stats about the attempts and informs latency metrics on the exceptions when executing Operations or borrowing Connections from the pool.

Note that extending classes need to implement functionality to borrowConnection(Operation) that must be used to execute the operation. They also need to implement canRetry() to tell this class when to stop borrowing connections on failed attempts.

See Also:

AbstractHostPartitionConnectionPool#executeWithFailover(Operation, com.netflix.astyanax.retry.RetryPolicy)} for references to this., RoundRobinExecuteWithFailover} as an example class that extends the functionality., RoundRobinConnectionPoolImpl} as an example of a {@link ConnectionPool} that employs the {@link RoundRobinExecuteWithFailover} for it's failover impl

Field Summary

protected ConnectionPoolConfiguration	config
protected Connection<CL>	connection

Constructor Summary

AbstractExecuteWithFailoverImpl(ConnectionPoolConfiguration config, ConnectionPoolMonitor monitor)
Public constructor

Method Summary

abstract Connection<CL>	borrowConnection(Operation<CL,R> operation)
abstract boolean	canRetry()
Host	getCurrentHost()
abstract HostConnectionPool<CL>	getCurrentHostConnectionPool()
protected void	releaseConnection()
OperationResult<R>	tryOperation(Operation<CL,R> operation) Basic impl that repeatedly borrows a conn and tries to execute the operation while maintaining metrics for success, conn attempts, failures and latencies for operation executions

Methods inherited from class java.lang.Object

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

Field Detail

connection

protected Connection<CL> connection

config

protected final ConnectionPoolConfiguration config

Constructor Detail

AbstractExecuteWithFailoverImpl

public AbstractExecuteWithFailoverImpl(ConnectionPoolConfiguration config,
                                       ConnectionPoolMonitor monitor)
                                throws ConnectionException

Public constructor

Parameters:

config -

monitor -

Throws:

ConnectionException

Method Detail

getCurrentHost

public final Host getCurrentHost()

Returns:

Host

getCurrentHostConnectionPool

public abstract HostConnectionPool<CL> getCurrentHostConnectionPool()

Returns:

HostConnectionPool

borrowConnection

public abstract Connection<CL> borrowConnection(Operation<CL,R> operation)
                                         throws ConnectionException

Parameters:

operation -

Returns:

Connection

Throws:

ConnectionException

canRetry

public abstract boolean canRetry()

Returns:

boolean

tryOperation

public OperationResult<R> tryOperation(Operation<CL,R> operation)
                                throws ConnectionException

Basic impl that repeatedly borrows a conn and tries to execute the operation while maintaining metrics for success, conn attempts, failures and latencies for operation executions

Specified by:

tryOperation in interface ExecuteWithFailover<CL,R>

Parameters:

operation -

Returns:

OperationResult

Throws:

ConnectionException

releaseConnection

protected void releaseConnection()