Cluster (Apache TinkerPop 3.4.5 API)

java.lang.Object
- org.apache.tinkerpop.gremlin.driver.Cluster

```
public final class Cluster
extends Object
```
A connection to a set of one or more Gremlin Server instances.

Author:

Stephen Mallette (http://stephen.genoprime.com)

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Cluster.Builder

Nested Classes
Modifier and Type	Class and Description
`static class`	`Cluster.Builder`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Collection<Host>`	`allHosts()` Gets a list of all the configured hosts.
`List<URI>`	`availableHosts()` Gets the list of hosts that the `Cluster` was able to connect to.
`static Cluster.Builder`	`build()`
`static Cluster.Builder`	`build(File configurationFile)`
`static Cluster.Builder`	`build(String address)`
`void`	`close()`
`CompletableFuture<Void>`	`closeAsync()`
`<T extends Client> T`	`connect()` Creates a `Client.ClusteredClient` instance to this `Cluster`, meaning requests will be routed to one or more servers (depending on the cluster configuration), where each request represents the entirety of a transaction.
`<T extends Client> T`	`connect(Client.Settings settings)` Creates a new `Client` based on the settings provided.
`<T extends Client> T`	`connect(String sessionId)` Creates a `Client.SessionedClient` instance to this `Cluster`, meaning requests will be routed to a single server (randomly selected from the cluster), where the same bindings will be available on each request.
`<T extends Client> T`	`connect(String sessionId, boolean manageTransactions)` Creates a `Client.SessionedClient` instance to this `Cluster`, meaning requests will be routed to a single server (randomly selected from the cluster), where the same bindings will be available on each request.
`String`	`getChannelizer()` Gets the `Channelizer` implementation to use on the client when creating a `Connection`.
`long`	`getKeepAliveInterval()` Gets time in milliseconds to wait after the last message is sent over a connection before sending a keep-alive message to the server.
`Class<? extends LoadBalancingStrategy>`	`getLoadBalancingStrategy()` Specifies the load balancing strategy to use on the client side.
`int`	`getMaxContentLength()` Gets the maximum size in bytes of any request sent to the server.
`int`	`getMaxInProcessPerConnection()` Gets the maximum number of in-flight requests that can occur on a `Connection`.
`int`	`getMaxWaitForConnection()` Gets the maximum amount of time to wait for a connection to be borrowed from the connection pool.
`int`	`getMaxWaitForSessionClose()` Gets how long a session will stay open assuming the current connection actually is configured for their use.
`int`	`getMinInProcessPerConnection()` Gets the minimum number of in-flight requests that can occur on a `Connection` before it is considered for closing on return to the `ConnectionPool`.
`int`	`getNioPoolSize()` Size of the pool for handling request/response operations.
`String`	`getPath()` Gets the path to the Gremlin service.
`int`	`getPort()` Gets the port that the Gremlin Servers will be listening on.
`int`	`getReconnectInterval()` Gets time in milliseconds to wait between retries when attempting to reconnect to a dead host.
`int`	`getResultIterationBatchSize()` Gets the override for the server setting that determines how many results are returned per batch.
`String[]`	`getSerializers()` Get the `MessageSerializer` MIME types supported.
`int`	`getWorkerPoolSize()` Size of the pool for handling background work.
`void`	`init()`
`boolean`	`isClosed()` Determines if the `Cluster` has completed its closing process after a call to `close()` or `closeAsync()`.
`boolean`	`isClosing()` Determines if the `Cluster` is in the process of closing given a call to `close()` or `closeAsync()`.
`boolean`	`isSslEnabled()` Determines if connectivity over SSL is enabled.
`int`	`maxConnectionPoolSize()` Gets the maximum size that the `ConnectionPool` can grow.
`int`	`maxSimultaneousUsagePerConnection()` Gets the maximum number of times that a `Connection` can be borrowed from the pool simultaneously.
`int`	`minConnectionPoolSize()` Gets the minimum size of the `ConnectionPool`.
`int`	`minSimultaneousUsagePerConnection()` Gets the minimum number of times that a `Connection` should be borrowed from the pool before it falls under consideration for closing.
`static Cluster`	`open()` Create a `Cluster` with all default settings which will connect to one contact point at `localhost`.
`static Cluster`	`open(Configuration conf)` Create a `Cluster` from Apache Configurations.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - init
```
public void init()
```
  - connect
```
public <T extends Client> T connect()
```
    Creates a Client.ClusteredClient instance to this Cluster, meaning requests will be routed to one or more servers (depending on the cluster configuration), where each request represents the entirety of a transaction. A commit or rollback (in case of error) is automatically executed at the end of the request.
    Note that calling this method does not imply that a connection is made to the server itself at this point. Therefore, if there is only one server specified in the Cluster and that server is not available an error will not be raised at this point. Connections get initialized in the Client when a request is submitted or can be directly initialized via Client.init().
  - connect
```
public <T extends Client> T connect(String sessionId)
```
    Creates a Client.SessionedClient instance to this Cluster, meaning requests will be routed to a single server (randomly selected from the cluster), where the same bindings will be available on each request. Requests are bound to the same thread on the server and thus transactions may extend beyond the bounds of a single request. The transactions are managed by the user and must be committed or rolled-back manually.
    Note that calling this method does not imply that a connection is made to the server itself at this point. Therefore, if there is only one server specified in the Cluster and that server is not available an error will not be raised at this point. Connections get initialized in the Client when a request is submitted or can be directly initialized via Client.init().
    
    Parameters:
    
    sessionId - user supplied id for the session which should be unique (a UUID is ideal).
  - connect
```
public <T extends Client> T connect(String sessionId,
                                    boolean manageTransactions)
```
    Creates a Client.SessionedClient instance to this Cluster, meaning requests will be routed to a single server (randomly selected from the cluster), where the same bindings will be available on each request. Requests are bound to the same thread on the server and thus transactions may extend beyond the bounds of a single request. If manageTransactions is set to false then transactions are managed by the user and must be committed or rolled-back manually. When set to true the transaction is committed or rolled-back at the end of each request.
    Note that calling this method does not imply that a connection is made to the server itself at this point. Therefore, if there is only one server specified in the Cluster and that server is not available an error will not be raised at this point. Connections get initialized in the Client when a request is submitted or can be directly initialized via Client.init().
    
    Parameters:
    
    sessionId - user supplied id for the session which should be unique (a UUID is ideal).
    
    manageTransactions - enables auto-transactions when set to true
  - connect
```
public <T extends Client> T connect(Client.Settings settings)
```
    Creates a new Client based on the settings provided.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - build
```
public static Cluster.Builder build()
```
  - build
```
public static Cluster.Builder build(String address)
```
  - build
```
public static Cluster.Builder build(File configurationFile)
                             throws FileNotFoundException
```
    Throws:
    
    FileNotFoundException
  - open
```
public static Cluster open()
```
    Create a Cluster with all default settings which will connect to one contact point at localhost.
  - open
```
public static Cluster open(Configuration conf)
```
    Create a Cluster from Apache Configurations.
  - close
```
public void close()
```
  - closeAsync
```
public CompletableFuture<Void> closeAsync()
```
  - isClosing
```
public boolean isClosing()
```
    Determines if the Cluster is in the process of closing given a call to close() or closeAsync().
  - isClosed
```
public boolean isClosed()
```
    Determines if the Cluster has completed its closing process after a call to close() or closeAsync().
  - availableHosts
```
public List<URI> availableHosts()
```
    Gets the list of hosts that the Cluster was able to connect to. A Host is assumed unavailable until a connection to it is proven to be present. This will not happen until the Client submits requests that succeed in reaching a server at the Host or Client.init() is called which initializes the ConnectionPool for the Client itself. The number of available hosts returned from this method will change as different servers come on and offline.
  - getPath
```
public String getPath()
```
    Gets the path to the Gremlin service.
  - getNioPoolSize
```
public int getNioPoolSize()
```
    Size of the pool for handling request/response operations.
  - getWorkerPoolSize
```
public int getWorkerPoolSize()
```
    Size of the pool for handling background work.
  - getSerializers
```
public String[] getSerializers()
```
    Get the MessageSerializer MIME types supported.
  - isSslEnabled
```
public boolean isSslEnabled()
```
    Determines if connectivity over SSL is enabled.
  - getMinInProcessPerConnection
```
public int getMinInProcessPerConnection()
```
    Gets the minimum number of in-flight requests that can occur on a Connection before it is considered for closing on return to the ConnectionPool.
  - getMaxInProcessPerConnection
```
public int getMaxInProcessPerConnection()
```
    Gets the maximum number of in-flight requests that can occur on a Connection.
  - maxSimultaneousUsagePerConnection
```
public int maxSimultaneousUsagePerConnection()
```
    Gets the maximum number of times that a Connection can be borrowed from the pool simultaneously.
  - minSimultaneousUsagePerConnection
```
public int minSimultaneousUsagePerConnection()
```
    Gets the minimum number of times that a Connection should be borrowed from the pool before it falls under consideration for closing.
  - maxConnectionPoolSize
```
public int maxConnectionPoolSize()
```
    Gets the maximum size that the ConnectionPool can grow.
  - minConnectionPoolSize
```
public int minConnectionPoolSize()
```
    Gets the minimum size of the ConnectionPool.
  - getResultIterationBatchSize
```
public int getResultIterationBatchSize()
```
    Gets the override for the server setting that determines how many results are returned per batch.
  - getMaxWaitForConnection
```
public int getMaxWaitForConnection()
```
    Gets the maximum amount of time to wait for a connection to be borrowed from the connection pool.
  - getMaxWaitForSessionClose
```
public int getMaxWaitForSessionClose()
```
    Gets how long a session will stay open assuming the current connection actually is configured for their use.
  - getMaxContentLength
```
public int getMaxContentLength()
```
    Gets the maximum size in bytes of any request sent to the server.
  - getChannelizer
```
public String getChannelizer()
```
    Gets the Channelizer implementation to use on the client when creating a Connection.
  - getReconnectInterval
```
public int getReconnectInterval()
```
    Gets time in milliseconds to wait between retries when attempting to reconnect to a dead host.
  - getKeepAliveInterval
```
public long getKeepAliveInterval()
```
    Gets time in milliseconds to wait after the last message is sent over a connection before sending a keep-alive message to the server.
  - getLoadBalancingStrategy
```
public Class<? extends LoadBalancingStrategy> getLoadBalancingStrategy()
```
    Specifies the load balancing strategy to use on the client side.
  - getPort
```
public int getPort()
```
    Gets the port that the Gremlin Servers will be listening on.
  - allHosts
```
public Collection<Host> allHosts()
```
    Gets a list of all the configured hosts.

Class Cluster

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Method Detail

init

connect

connect

connect

connect

toString

build

build

build

open

open

close

closeAsync

isClosing

isClosed

availableHosts

getPath

getNioPoolSize

getWorkerPoolSize

getSerializers

isSslEnabled

getMinInProcessPerConnection

getMaxInProcessPerConnection

maxSimultaneousUsagePerConnection

minSimultaneousUsagePerConnection

maxConnectionPoolSize

minConnectionPoolSize

getResultIterationBatchSize

getMaxWaitForConnection

getMaxWaitForSessionClose

getMaxContentLength

getChannelizer

getReconnectInterval

getKeepAliveInterval

getLoadBalancingStrategy

getPort

allHosts