org.glassfish.grizzly.connectionpool

Class MultiEndpointPool<E>

java.lang.Object

org.glassfish.grizzly.connectionpool.MultiEndpointPool<E>

Type Parameters:

E - the address type, for example for TCP transport it's SocketAddress

public class MultiEndpointPool<E>
extends Object

The multi endpoint Connection pool implementation where each endpoint sub-pool is represented by SingleEndpointPool and referenced by an Endpoint. There are number of configuration options supported by the MultiEndpointPool: - maxConnectionsPerEndpoint: the maximum number of Connections each SingleEndpointPool sub-pool is allowed to have; - maxConnectionsTotal: the total maximum number of Connections to be kept by the pool; - keepAliveTimeoutMillis: the maximum number of milliseconds an idle Connection will be kept in the pool. The idle Connections will be closed until the pool size is greater than the corePoolSize; - keepAliveCheckIntervalMillis: the interval, which specifies how often the pool will perform idle Connections check; - reconnectDelayMillis: the delay to be used before the pool will repeat the attempt to connect to the endpoint after previous connect had failed. - asyncPollTimeoutMillis: maximum amount of time, after which the async connection poll operation will be failed with a timeout exception - connectionTTLMillis: the maximum amount of time, a Connection could be associated with the pool

Author:

Alexey Stashok

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MultiEndpointPool.Builder<E> The Builder class responsible for constructing SingleEndpointPool.
static class	MultiEndpointPool.EndpointPoolBuilder<E>
static interface	MultiEndpointPool.EndpointPoolCustomizer<E> The customizer, which could be used to modify an endpoint pool setting before it will be created.

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<Endpoint<E>,SingleEndpointPool<E>>	endpointToPoolMap Maps endpoint -to- SingleEndpointPool
protected Object	poolSync Sync for endpointToPoolMap updates

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MultiEndpointPool(org.glassfish.grizzly.ConnectorHandler<E> defaultConnectorHandler, int maxConnectionsPerEndpoint, int maxConnectionsTotal, org.glassfish.grizzly.utils.DelayedExecutor delayedExecutor, long connectTimeoutMillis, long keepAliveTimeoutMillis, long keepAliveCheckIntervalMillis, long reconnectDelayMillis, int maxReconnectAttempts, long asyncPollTimeoutMillis, long connectionTTLMillis, boolean failFastWhenMaxSizeReached, MultiEndpointPool.EndpointPoolCustomizer<E> endpointPoolCustomizer) Deprecated. defaultConnectorHandler is deprecated
protected	MultiEndpointPool(int maxConnectionsPerEndpoint, int maxConnectionsTotal, org.glassfish.grizzly.utils.DelayedExecutor delayedExecutor, long connectTimeoutMillis, long keepAliveTimeoutMillis, long keepAliveCheckIntervalMillis, long reconnectDelayMillis, int maxReconnectAttempts, long asyncPollTimeoutMillis, long connectionTTLMillis, boolean failFastWhenMaxSizeReached, MultiEndpointPool.EndpointPoolCustomizer<E> endpointPoolCustomizer) Constructs MultiEndpointPool instance.

Method Summary

Modifier and Type	Method and Description
boolean	attach(Endpoint<E> endpoint, org.glassfish.grizzly.Connection connection) Attaches "foreign" Connection to the pool.
static <T> MultiEndpointPool.Builder<T>	builder(Class<T> endpointType) Returns single endpoint pool SingleEndpointPool.Builder.
protected void	checkNotClosed() Method throws IOException if the pool has been closed.
void	close() Closes the pool and releases associated resources.
void	close(Endpoint<E> endpoint) Closes specific endpoint associated pool and releases its resources.
protected SingleEndpointPool<E>	createSingleEndpointPool(Endpoint<E> endpoint) Creates SingleEndpointPool instance.
boolean	detach(org.glassfish.grizzly.Connection connection) Detaches a Connection from the pool.
long	getAsyncPollTimeout(TimeUnit timeUnit)
ConnectionInfo<E>	getConnectionInfo(org.glassfish.grizzly.Connection connection) Returns pooled ConnectionInfo, that might be used for monitoring reasons, or null if the Connection does not belong to this pool.
long	getConnectionTTL(TimeUnit timeUnit) Return the maximum amount of time, a Connection could be associated with the pool.
long	getConnectTimeout(TimeUnit timeUnit)
long	getKeepAliveCheckInterval(TimeUnit timeUnit)
long	getKeepAliveTimeout(TimeUnit timeUnit) Returns the maximum amount of time an idle Connection will be kept in the pool.
int	getMaxConnectionsPerEndpoint()
int	getMaxConnectionsTotal()
int	getMaxReconnectAttempts()
int	getOpenConnectionsCount()
long	getReconnectDelay(TimeUnit timeUnit)
boolean	isBusy(org.glassfish.grizzly.Connection connection) Returns true only if the Connection is registered in the pool and is currently in busy state (used by a user), otherwise returns false.
boolean	isFailFastWhenMaxSizeReached()
boolean	isMaxCapacityReached()
boolean	isRegistered(org.glassfish.grizzly.Connection connection) Returns true if the Connection is registered in the pool no matter if it's currently in busy or ready state, or false if the Connection is not registered in the pool.
protected SingleEndpointPool<E>	obtainSingleEndpointPool(Endpoint<E> endpoint) Obtains SingleEndpointPool associated with the specific endpoint represented by Endpoint.
org.glassfish.grizzly.Connection	poll(Endpoint<E> endpoint)
boolean	release(org.glassfish.grizzly.Connection connection) Returns the Connection to the pool.
int	size()
org.glassfish.grizzly.GrizzlyFuture<org.glassfish.grizzly.Connection>	take(Endpoint<E> endpoint) Obtains a Connection to the specified endpoint from the pool in non-blocking/asynchronous fashion.
void	take(Endpoint<E> endpoint, org.glassfish.grizzly.CompletionHandler<org.glassfish.grizzly.Connection> completionHandler) Obtains a Connection to the specified endpoint from the pool in non-blocking/asynchronous fashion.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

endpointToPoolMap

protected final Map<Endpoint<E>,SingleEndpointPool<E>> endpointToPoolMap

Maps endpoint -to- SingleEndpointPool

poolSync

protected final Object poolSync

Sync for endpointToPoolMap updates

Constructor Detail

MultiEndpointPool

protected MultiEndpointPool(org.glassfish.grizzly.ConnectorHandler<E> defaultConnectorHandler,
                            int maxConnectionsPerEndpoint,
                            int maxConnectionsTotal,
                            org.glassfish.grizzly.utils.DelayedExecutor delayedExecutor,
                            long connectTimeoutMillis,
                            long keepAliveTimeoutMillis,
                            long keepAliveCheckIntervalMillis,
                            long reconnectDelayMillis,
                            int maxReconnectAttempts,
                            long asyncPollTimeoutMillis,
                            long connectionTTLMillis,
                            boolean failFastWhenMaxSizeReached,
                            MultiEndpointPool.EndpointPoolCustomizer<E> endpointPoolCustomizer)

Deprecated. defaultConnectorHandler is deprecated

Constructs MultiEndpointPool instance.

Parameters:

defaultConnectorHandler - the default ConnectorHandler to be used to establish new Connections

maxConnectionsPerEndpoint - the maximum number of Connections single endpoint sub-pool is allowed to have

maxConnectionsTotal - the total maximum number of Connections the pool is allowed to have

delayedExecutor - custom DelayedExecutor to be used by keep-alive and reconnect mechanisms

connectTimeoutMillis - timeout, after which, if a connection is not established, it is considered failed

keepAliveTimeoutMillis - the maximum number of milliseconds an idle Connection will be kept in the pool

keepAliveCheckIntervalMillis - the interval, which specifies how often the pool will perform idle Connections check

reconnectDelayMillis - the delay to be used before the pool will repeat the attempt to connect to the endpoint after previous connect had failed

maxReconnectAttempts - the maximum number of reconnect attempts that may be made before failure notification.

asyncPollTimeoutMillis - the maximum time, the async poll operation could wait for a connection to become available

connectionTTLMillis - the maximum time, a connection could stay registered with the pool

failFastWhenMaxSizeReached - true if the "take" method should fail fast if there is no free connection in the pool and max pool size is reached

endpointPoolCustomizer - the customizer, which will be used to modify a specific endpoint pool settings and overwrite the default settings assigned by this MultiEndpointPool

MultiEndpointPool

protected MultiEndpointPool(int maxConnectionsPerEndpoint,
                            int maxConnectionsTotal,
                            org.glassfish.grizzly.utils.DelayedExecutor delayedExecutor,
                            long connectTimeoutMillis,
                            long keepAliveTimeoutMillis,
                            long keepAliveCheckIntervalMillis,
                            long reconnectDelayMillis,
                            int maxReconnectAttempts,
                            long asyncPollTimeoutMillis,
                            long connectionTTLMillis,
                            boolean failFastWhenMaxSizeReached,
                            MultiEndpointPool.EndpointPoolCustomizer<E> endpointPoolCustomizer)

Constructs MultiEndpointPool instance.

Parameters:

maxConnectionsPerEndpoint - the maximum number of Connections single endpoint sub-pool is allowed to have

maxConnectionsTotal - the total maximum number of Connections the pool is allowed to have

delayedExecutor - custom DelayedExecutor to be used by keep-alive and reconnect mechanisms

connectTimeoutMillis - timeout, after which, if a connection is not established, it is considered failed

keepAliveTimeoutMillis - the maximum number of milliseconds an idle Connection will be kept in the pool

keepAliveCheckIntervalMillis - the interval, which specifies how often the pool will perform idle Connections check

reconnectDelayMillis - the delay to be used before the pool will repeat the attempt to connect to the endpoint after previous connect had failed

maxReconnectAttempts - the maximum number of reconnect attempts that may be made before failure notification.

asyncPollTimeoutMillis - the maximum time, the async poll operation could wait for a connection to become available

connectionTTLMillis - the maximum time, a connection could stay registered with the pool

failFastWhenMaxSizeReached - true if the "take" method should fail fast if there is no free connection in the pool and max pool size is reached

endpointPoolCustomizer - the customizer, which will be used to modify a specific endpoint pool settings and overwrite the default settings assigned by this MultiEndpointPool

Method Detail

builder

public static <T> MultiEndpointPool.Builder<T> builder(Class<T> endpointType)

Returns single endpoint pool SingleEndpointPool.Builder.

Type Parameters:

T - endpoint type

Parameters:

endpointType - endpoint address type, for example SocketAddress for TCP and UDP transports

Returns:

SingleEndpointPool.Builder

getMaxConnectionsTotal

public int getMaxConnectionsTotal()

Returns:

the total maximum number of Connections to be kept by the pool

getMaxConnectionsPerEndpoint

public int getMaxConnectionsPerEndpoint()

Returns:

the maximum number of Connections each SingleEndpointPool sub-pool is allowed to have

getConnectTimeout

public long getConnectTimeout(TimeUnit timeUnit)

Parameters:

timeUnit - TimeUnit

Returns:

the connection timeout, after which, if a connection is not established, it is considered failed

getReconnectDelay

public long getReconnectDelay(TimeUnit timeUnit)

Parameters:

timeUnit - TimeUnit

Returns:

the delay to be used before the pool will repeat the attempt to connect to the endpoint after previous attempt fail

getMaxReconnectAttempts

public int getMaxReconnectAttempts()

Returns:

the maximum number of reconnect attempts

getKeepAliveTimeout

public long getKeepAliveTimeout(TimeUnit timeUnit)

Returns the maximum amount of time an idle Connection will be kept in the pool.

Parameters:

timeUnit - TimeUnit

Returns:

the maximum amount of time an idle Connection will be kept in the pool

getKeepAliveCheckInterval

public long getKeepAliveCheckInterval(TimeUnit timeUnit)

Parameters:

timeUnit - TimeUnit

Returns:

the interval, which specifies how often the pool will perform idle Connections check

getAsyncPollTimeout

public long getAsyncPollTimeout(TimeUnit timeUnit)

Parameters:

timeUnit - TimeUnit

Returns:

the timeout, after which, the async connection poll operation will fail with a timeout exception

getConnectionTTL

public long getConnectionTTL(TimeUnit timeUnit)

Return the maximum amount of time, a Connection could be associated with the pool. Once timeout is hit - the connection will be either closed, if it's idle, or detached from the pool, if it's being used.

Parameters:

timeUnit - TimeUnit

Returns:

the maximum amount of time, a Connection could be associated with the pool

isFailFastWhenMaxSizeReached

public boolean isFailFastWhenMaxSizeReached()

Returns:

true, if the "take" method will fail fast if there is no free connection in the pool and max pool size is reached

size

public int size()

Returns:

the current pool size. This value includes connected and connecting (connect in progress) Connections

getOpenConnectionsCount

public int getOpenConnectionsCount()

Returns:

the number of connected Connections in the pool. Unlike size() the value doesn't include connecting (connect in progress) Connections

isMaxCapacityReached

public boolean isMaxCapacityReached()

Returns:

true is maximum number of Connections the pool can keep is reached and no new Connection can be established, or false otherwise.

isRegistered

public boolean isRegistered(org.glassfish.grizzly.Connection connection)

Returns true if the Connection is registered in the pool no matter if it's currently in busy or ready state, or false if the Connection is not registered in the pool.

Parameters:

connection - Connection

Returns:

true if the Connection is registered in the pool no matter if it's currently in busy or ready state, or false if the Connection is not registered in the pool

isBusy

public boolean isBusy(org.glassfish.grizzly.Connection connection)

Returns true only if the Connection is registered in the pool and is currently in busy state (used by a user), otherwise returns false.

Parameters:

connection - Connection

Returns:

true only if the Connection is registered in the pool and is currently in busy state (used by a user), otherwise returns false

getConnectionInfo

public ConnectionInfo<E> getConnectionInfo(org.glassfish.grizzly.Connection connection)

Returns pooled ConnectionInfo, that might be used for monitoring reasons, or null if the Connection does not belong to this pool.

Parameters:

connection - Connection

Returns:

pooled ConnectionInfo, that might be used for monitoring reasons, or null if the Connection does not belong to this pool

take

public org.glassfish.grizzly.GrizzlyFuture<org.glassfish.grizzly.Connection> take(Endpoint<E> endpoint)

Obtains a Connection to the specified endpoint from the pool in non-blocking/asynchronous fashion. Returns a GrizzlyFuture representing the pending result of the non-blocking/asynchronous obtain task. Future's get method will return the Connection once it becomes available in the pool.

If you would like to immediately block waiting for a Connection, you can use constructions of the form connection = pool.take(endpoint).get();

Note: returned GrizzlyFuture must be checked and released properly. It must not be forgotten, because a Connection, that might be assigned as a result of GrizzlyFuture has to be returned to the pool. If you gave up on waiting for a Connection or you are not interested in the Connection anymore, the proper release code has to look like:

 if (!future.cancel(false)) {
     // means Connection is ready
     pool.release(future.get());
 }
 

Parameters:

endpoint - Endpoint, that represents an endpoint

Returns:

GrizzlyFuture

take

public void take(Endpoint<E> endpoint,
                 org.glassfish.grizzly.CompletionHandler<org.glassfish.grizzly.Connection> completionHandler)

Obtains a Connection to the specified endpoint from the pool in non-blocking/asynchronous fashion. The passed CompletionHandler will be notified about the result of the non-blocking/asynchronous obtain task.

Parameters:

endpoint - Endpoint, that represents an endpoint

completionHandler -

poll

public org.glassfish.grizzly.Connection poll(Endpoint<E> endpoint)
                                      throws IOException

Parameters:

endpoint - Endpoint, that represents an endpoint

Returns:

a Connection from the pool, if there is one available at the moment, or null otherwise

Throws:

IOException - if the pool is closed

release

public boolean release(org.glassfish.grizzly.Connection connection)

Returns the Connection to the pool. The Connection will be returned to the pool only in case it was created by this pool, or it was attached to it using attach(Endpoint, org.glassfish.grizzly.Connection) method. If the Connection is not registered in the pool - it will be closed. If the Connection is registered in the pool and already marked as ready - this method call will not have any effect. If the Connection was returned - it is illegal to use it until it is retrieved from the pool again.

Parameters:

connection - the Connection to return

Returns:

true if the connection was successfully released. If the connection cannot be released, the connection will be closed and false will be returned.

attach

public boolean attach(Endpoint<E> endpoint,
                      org.glassfish.grizzly.Connection connection)
               throws IOException

Attaches "foreign" Connection to the pool. This method might be used to add to the pool a Connection, that either has not been created by this pool or has been detached.

Parameters:

endpoint - Endpoint, that represents an endpoint to which the the Connection will be attached

connection - Connection

Returns:

true if the Connection has been successfully attached, or false otherwise. If the Connection had been already registered in the pool - the method call doesn't have any effect and true will be returned.

Throws:

IOException - thrown if this pool has been already closed

detach

public boolean detach(org.glassfish.grizzly.Connection connection)

Detaches a Connection from the pool. De-registers the Connection from the pool and decreases the pool size by 1. It is possible to re-attach the detached Connection later by calling attach(org.glassfish.grizzly.connectionpool.Endpoint, org.glassfish.grizzly.Connection). If the Connection was not registered in the pool - the method call doesn't have any effect.

Parameters:

connection - the Connection to detach

Returns:

true if the Connection was detached, otherwise returns false

close

public void close(Endpoint<E> endpoint)

Closes specific endpoint associated pool and releases its resources. The ready Connections associated with the endpoint pool will be closed, the busy Connection, that are still in use - will be kept open and will be automatically closed when returned to the pool by release(org.glassfish.grizzly.Connection).

Parameters:

endpoint - Endpoint, that represents an endpoint

close

public void close()

Closes the pool and releases associated resources. The ready Connections will be closed, the busy Connection, that are still in use - will be kept open and will be automatically closed when returned to the pool by release(org.glassfish.grizzly.Connection).

toString

public String toString()

Overrides:

toString in class Object

obtainSingleEndpointPool

protected SingleEndpointPool<E> obtainSingleEndpointPool(Endpoint<E> endpoint)
                                                  throws IOException

Obtains SingleEndpointPool associated with the specific endpoint represented by Endpoint. If there is no SingleEndpointPool associated with the endpoint - the one will be created.

Parameters:

endpoint - Endpoint, that represents an endpoint

Returns:

SingleEndpointPool

Throws:

IOException - if the pool is already closed

createSingleEndpointPool

protected SingleEndpointPool<E> createSingleEndpointPool(Endpoint<E> endpoint)

Creates SingleEndpointPool instance.

Parameters:

endpoint - the endpoint key

Returns:

SingleEndpointPool

checkNotClosed

protected void checkNotClosed()
                       throws IOException

Method throws IOException if the pool has been closed.

Throws:

IOException - if the pool has been closed