IoEnvironment (Couchbase JVM Core IO 2.0.6 API)

java.lang.Object
- com.couchbase.client.core.env.IoEnvironment

```
public class IoEnvironment
extends Object
```
The IoEnvironment holds the I/O event loops and state.
Note that this class only contains tunables and state for the I/O event loops that drive the actual operations inside netty. If you are looking for general configuration if I/O properties, those are located inside the IoConfig class instead.
By default the IO environment creates 3 distinct EventLoopGroups. One for HTTP services (which includes query, search, analytics and views), one for the KV service and one for the management service. The HTTP and the KV service try to occupy a "fair" number of thread pools for each. Usually it will be half the number of reported logical CPUs by the JVM, but maximum of 8 and minimum of 2 each. The management service will only ever occupy one thread. The HTTP and KV thread pools are split in SDK 3 (they were not in SDK 2) so that longer running N1QL queries and larger streaming results do not interfere with high-throughput low-latency KV workloads as much.
By default, the SDK will use "native" event loop groups - epoll on linux and kqueue on OSX in favor of the more generic and slower NIO transport. This should work fine out of the box nearly always, but you can disable it through the enableNativeIo(boolean) builder setting.
You cannot re-use your own event loop groups from your own application because the SDK ships a repackaged netty version to avoid version and classpath issues.

Since:

2.0.0

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class IoEnvironment.Builder

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

Field Summary

Fields
Modifier and Type Field and Description

static boolean DEFAULT_NATIVE_IO_ENABLED
Native IO is enabled by default.

Fields
Modifier and Type	Field and Description
`static boolean`	`DEFAULT_NATIVE_IO_ENABLED` Native IO is enabled by default.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup>`	`analyticsEventLoopGroup()` Returns the `EventLoopGroup` to be used for analytics traffic.
`static IoEnvironment.Builder`	`analyticsEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)` Allows to specify a custom event loop group (I/O event loop thread pool) for the analytics service.
`static IoEnvironment.Builder`	`builder()` Creates a Builder for the `IoEnvironment` to customize its settings.
`static IoEnvironment`	`create()` Creates the `IoEnvironment` with default settings.
`static IoEnvironment.Builder`	`enableNativeIo(boolean nativeIoEnabled)` If set to false (enabled by default) will force using the java NIO based IO transport.
`static IoEnvironment.Builder`	`eventLoopThreadCount(int eventLoopThreadCount)` Overrides the number of threads used per event loop.
`Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup>`	`kvEventLoopGroup()` Returns the `EventLoopGroup` to be used for Key/Value traffic.
`static IoEnvironment.Builder`	`kvEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)` Allows to specify a custom event loop group (I/O event loop thread pool) for the management service.
`Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup>`	`managerEventLoopGroup()` Returns the `EventLoopGroup` to be used for config traffic.
`static IoEnvironment.Builder`	`managerEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)` Allows to specify a custom event loop group (I/O event loop thread pool) for the management service.
`boolean`	`nativeIoEnabled()` Returns true if native IO is enabled and can be used if supported.
`Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup>`	`queryEventLoopGroup()` Returns the `EventLoopGroup` to be used for N1QL Query traffic.
`static IoEnvironment.Builder`	`queryEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)` Allows to specify a custom event loop group (I/O event loop thread pool) for the query service.
`Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup>`	`searchEventLoopGroup()` Returns the `EventLoopGroup` to be used for search traffic.
`static IoEnvironment.Builder`	`searchEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)` Allows to specify a custom event loop group (I/O event loop thread pool) for the search service.
`Mono<Void>`	`shutdown(Duration timeout)` Instructs all the owned event loops to shut down.
`Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup>`	`viewEventLoopGroup()` Returns the `EventLoopGroup` to be used for view traffic.
`static IoEnvironment.Builder`	`viewEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)` Allows to specify a custom event loop group (I/O event loop thread pool) for the view service.

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

- Field Detail
  - DEFAULT_NATIVE_IO_ENABLED
```
public static final boolean DEFAULT_NATIVE_IO_ENABLED
```
    Native IO is enabled by default.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - create
```
public static IoEnvironment create()
```
    Creates the IoEnvironment with default settings.
    
    Returns:
    
    the created environment.
  - builder
```
public static IoEnvironment.Builder builder()
```
    Creates a Builder for the IoEnvironment to customize its settings.
    
    Returns:
    
    the IoEnvironment.Builder to customize the settings.
  - managerEventLoopGroup
```
public static IoEnvironment.Builder managerEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)
```
    Allows to specify a custom event loop group (I/O event loop thread pool) for the management service.
    Note that you usually do not need to tweak the event loop for the manager service, only if you perform long-running management queries that interfere with regular traffic.
    Note: tweaking the dedicated event loops should be done with care and only after profiling indicated that the default event loop setup is not achieving the desired performance characteristics. Please see the javadoc for the IoEnvironment class for an explanation how the event loops play together for all the services and what effect a custom pool might have.
    
    Parameters:
    
    eventLoopGroup - the dedicated event loop group to use.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - kvEventLoopGroup
```
public static IoEnvironment.Builder kvEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)
```
    Allows to specify a custom event loop group (I/O event loop thread pool) for the management service.
    Note: tweaking the dedicated event loops should be done with care and only after profiling indicated that the default event loop setup is not achieving the desired performance characteristics. Please see the javadoc for the IoEnvironment class for an explanation how the event loops play together for all the services and what effect a custom pool might have.
    
    Parameters:
    
    eventLoopGroup - the dedicated event loop group to use.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - queryEventLoopGroup
```
public static IoEnvironment.Builder queryEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)
```
    Allows to specify a custom event loop group (I/O event loop thread pool) for the query service.
    Note: tweaking the dedicated event loops should be done with care and only after profiling indicated that the default event loop setup is not achieving the desired performance characteristics. Please see the javadoc for the IoEnvironment class for an explanation how the event loops play together for all the services and what effect a custom pool might have.
    
    Parameters:
    
    eventLoopGroup - the dedicated event loop group to use.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - analyticsEventLoopGroup
```
public static IoEnvironment.Builder analyticsEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)
```
    Allows to specify a custom event loop group (I/O event loop thread pool) for the analytics service.
    Note: tweaking the dedicated event loops should be done with care and only after profiling indicated that the default event loop setup is not achieving the desired performance characteristics. Please see the javadoc for the IoEnvironment class for an explanation how the event loops play together for all the services and what effect a custom pool might have.
    
    Parameters:
    
    eventLoopGroup - the dedicated event loop group to use.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - searchEventLoopGroup
```
public static IoEnvironment.Builder searchEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)
```
    Allows to specify a custom event loop group (I/O event loop thread pool) for the search service.
    Note: tweaking the dedicated event loops should be done with care and only after profiling indicated that the default event loop setup is not achieving the desired performance characteristics. Please see the javadoc for the IoEnvironment class for an explanation how the event loops play together for all the services and what effect a custom pool might have.
    
    Parameters:
    
    eventLoopGroup - the dedicated event loop group to use.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - viewEventLoopGroup
```
public static IoEnvironment.Builder viewEventLoopGroup(com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup eventLoopGroup)
```
    Allows to specify a custom event loop group (I/O event loop thread pool) for the view service.
    Note: tweaking the dedicated event loops should be done with care and only after profiling indicated that the default event loop setup is not achieving the desired performance characteristics. Please see the javadoc for the IoEnvironment class for an explanation how the event loops play together for all the services and what effect a custom pool might have.
    
    Parameters:
    
    eventLoopGroup - the dedicated event loop group to use.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - eventLoopThreadCount
```
public static IoEnvironment.Builder eventLoopThreadCount(int eventLoopThreadCount)
```
    Overrides the number of threads used per event loop.
    If not manually overridden, a fair thread count is calculated, see fairThreadCount() for more information on the heuristics.
    Note that the count provided will only be used by event loops that the SDK creates. If you configure a custom event loop (i.e. through kvEventLoopGroup(EventLoopGroup)) you are responsible for sizing it appropriately on your own.
    
    Parameters:
    
    eventLoopThreadCount - the number of event loops to use per pool.
    
    Returns:
    
    the IoEnvironment.Builder for chaining purposes.
  - enableNativeIo
```
public static IoEnvironment.Builder enableNativeIo(boolean nativeIoEnabled)
```
    If set to false (enabled by default) will force using the java NIO based IO transport.
    Usually the native transports used (epoll on linux and kqueue on OSX) are going to be faster and more efficient than the generic NIO one. We recommend to only set this to false if you experience issues with the native transports or instructed by couchbase support to do so for troubleshooting reasons.
    
    Parameters:
    
    nativeIoEnabled - if native IO should be enabled or disabled.
    
    Returns:
    
    this IoEnvironment.Builder for chaining purposes.
  - managerEventLoopGroup
```
public Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup> managerEventLoopGroup()
```
    Returns the EventLoopGroup to be used for config traffic.
    
    Returns:
    
    the selected event loop group.
  - kvEventLoopGroup
```
public Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup> kvEventLoopGroup()
```
    Returns the EventLoopGroup to be used for Key/Value traffic.
    
    Returns:
    
    the selected event loop group.
  - queryEventLoopGroup
```
public Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup> queryEventLoopGroup()
```
    Returns the EventLoopGroup to be used for N1QL Query traffic.
    
    Returns:
    
    the selected event loop group.
  - analyticsEventLoopGroup
```
public Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup> analyticsEventLoopGroup()
```
    Returns the EventLoopGroup to be used for analytics traffic.
    
    Returns:
    
    the selected event loop group.
  - searchEventLoopGroup
```
public Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup> searchEventLoopGroup()
```
    Returns the EventLoopGroup to be used for search traffic.
    
    Returns:
    
    the selected event loop group.
  - viewEventLoopGroup
```
public Supplier<com.couchbase.client.core.deps.io.netty.channel.EventLoopGroup> viewEventLoopGroup()
```
    Returns the EventLoopGroup to be used for view traffic.
    
    Returns:
    
    the selected event loop group.
  - nativeIoEnabled
```
public boolean nativeIoEnabled()
```
    Returns true if native IO is enabled and can be used if supported.
    
    Returns:
    
    true if enabled.
  - shutdown
```
public Mono<Void> shutdown(Duration timeout)
```
    Instructs all the owned event loops to shut down.
    
    Parameters:
    
    timeout - the maximum amount of time to wait before returning back control.
    
    Returns:
    
    a mono that completes once finished.

Class IoEnvironment

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_NATIVE_IO_ENABLED

Method Detail

create

builder

managerEventLoopGroup

kvEventLoopGroup

queryEventLoopGroup

analyticsEventLoopGroup

searchEventLoopGroup

viewEventLoopGroup

eventLoopThreadCount

enableNativeIo

managerEventLoopGroup

kvEventLoopGroup

queryEventLoopGroup

analyticsEventLoopGroup

searchEventLoopGroup

viewEventLoopGroup

nativeIoEnabled

shutdown