com.netflix.turbine.data.meta

Class MetaInformation<K extends TurbineData>

java.lang.Object

com.netflix.turbine.data.meta.MetaInformation<K>

Type Parameters:

K -

public class MetaInformation<K extends TurbineData>
extends java.lang.Object

Simple class that tracks the metadata about a cluster monitor. For now we simply track the no of hosts that the cluster monitor is actively receiving data from in the last 10 seconds. The meta data is periodically streamed to downstream listeners using a dedicated thread. This helps keep the meta info reliability independent of the actual data streaming from upstream InstanceMonitor(s) An e.g of meta info is data: {type:meta, name:meta, reportingHostsLast10Seconds:30} See MetaInfoUpdator for details on how and when the meta info is updated and sent downstream. See MetaInfoAdaptor for details on how data from the MetaInfo is converted to the right data format in order to be streamed to interested listeners.

Field Summary

Fields

Modifier and Type	Field and Description
protected ClusterMonitor<K>	clusterMonitor
protected java.util.concurrent.atomic.AtomicLong	lastUpdateTime
static java.lang.String	Meta
protected MetaInfoAdaptor<K>	metaInfoAdaptor
protected java.util.concurrent.atomic.AtomicLong	numReportingHosts
static java.lang.String	ReportingHostsLast10Seconds
static java.lang.String	Timestamp

Constructor Summary

Constructors

Constructor and Description
MetaInformation(ClusterMonitor<K> monitor, MetaInfoAdaptor<K> adaptor) Public constructor

Method Summary

Methods

Modifier and Type	Method and Description
long	getLastUpdateTime() Timestamp when the meta info was last updated
long	getReportingHosts() Return hosts that received data in the last 10 seconds
boolean	shouldStream() Used to determine whether we should send the data downstream.
void	streamDataToListeners() Send data to downstream listeners.
void	update() Update the meta info using the custom biz logic.

Methods inherited from class java.lang.Object

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

Field Detail

clusterMonitor

protected final ClusterMonitor<K extends TurbineData> clusterMonitor

metaInfoAdaptor

protected final MetaInfoAdaptor<K extends TurbineData> metaInfoAdaptor

lastUpdateTime

protected final java.util.concurrent.atomic.AtomicLong lastUpdateTime

numReportingHosts

protected final java.util.concurrent.atomic.AtomicLong numReportingHosts

Meta

public static final java.lang.String Meta

See Also:

Constant Field Values

ReportingHostsLast10Seconds

public static final java.lang.String ReportingHostsLast10Seconds

See Also:

Constant Field Values

Timestamp

public static final java.lang.String Timestamp

See Also:

Constant Field Values

Constructor Detail

MetaInformation

public MetaInformation(ClusterMonitor<K> monitor,
               MetaInfoAdaptor<K> adaptor)

Public constructor

Parameters:

monitor -

adaptor -

Method Detail

shouldStream

public boolean shouldStream()

Used to determine whether we should send the data downstream.

Returns:

update

public void update()

Update the meta info using the custom biz logic. One can extend and/or override this method to add their own meta information Note that you will also need an adaptor to translate the meta data state to a streamable data format.

streamDataToListeners

public void streamDataToListeners()

Send data to downstream listeners.

getReportingHosts

public long getReportingHosts()

Return hosts that received data in the last 10 seconds

Returns:

long

getLastUpdateTime

public long getLastUpdateTime()

Timestamp when the meta info was last updated

Returns:

long