| Name | Description | Type | Package | Framework |
| AbstractConstant | Base implementation of Constant. | Class | io.netty.util | Netty |
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| AbstractEventExecutor | Abstract base class for EventExecutor implementations. | Class | io.netty.util.concurrent | Netty |
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| AbstractEventExecutorGroup | Abstract base class for EventExecutorGroup implementations. | Class | io.netty.util.concurrent | Netty |
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| AbstractFuture | Abstract Future implementation which does not allow for cancellation. | Class | io.netty.util.concurrent | Netty |
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| AbstractReferenceCounted | Abstract base class for classes wants to implement ReferenceCounted. | Class | io.netty.util | Netty |
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| AbstractScheduledEventExecutor | Abstract base class for EventExecutors that want to support scheduling. | Class | io.netty.util.concurrent | Netty |
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| Attribute | An attribute which allows to store a value reference. | Interface | io.netty.util | Netty |
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| AttributeKey | Key which can be used to access Attribute out of the AttributeMap. | Class | io.netty.util | Netty |
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| AttributeMap | Holds Attributes which can be accessed via AttributeKey. | Interface | io.netty.util | Netty |
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| BlockingOperationException | An IllegalStateException which is raised when a user performed a blocking operationwhen the user is in an event loop thread. | Class | io.netty.util.concurrent | Netty |
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| CharsetUtil | A utility class that provides various common operations and constantsrelated with Charset and its relevant classes. | Class | io.netty.util | Netty |
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| CompleteFuture | A skeletal Future implementation which represents a Future which has been completed already. | Class | io.netty.util.concurrent | Netty |
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| Constant | A singleton which is safe to compare via the == operator. | Interface | io.netty.util | Netty |
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| ConstantPool | A pool of Constants. | Class | io.netty.util | Netty |
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| DefaultAttributeMap | | Class | io.netty.util | Netty |
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| DefaultEventExecutor | | Class | io.netty.util.concurrent | Netty |
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| DefaultEventExecutorGroup | Default implementation of MultithreadEventExecutorGroup which will use DefaultEventExecutorinstances to handle the tasks. | Class | io.netty.util.concurrent | Netty |
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| DefaultExecutorServiceFactory | An implementation of an ExecutorServiceFactory that creates a new ForkJoinPool on eachcall to newExecutorService(int). | Class | io.netty.util.concurrent | Netty |
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| DefaultProgressivePromise | | Class | io.netty.util.concurrent | Netty |
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| DefaultPromise | | Class | io.netty.util.concurrent | Netty |
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| DefaultThreadFactory | A ThreadFactory implementation with a simple naming rule. | Class | io.netty.util.concurrent | Netty |
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| DomainNameMapping | Maps a domain name to its associated value object. | Class | io.netty.util | Netty |
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| EventExecutor | The EventExecutor is a special EventExecutorGroup which comeswith some handy methods to see if a Thread is executed in a event loop. | Interface | io.netty.util.concurrent | Netty |
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| EventExecutorGroup | The EventExecutorGroup is responsible for providing the EventExecutor's to usevia its next() method. | Interface | io.netty.util.concurrent | Netty |
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| ExecutorServiceFactory | An object that creates new ExecutorService on demand. | Interface | io.netty.util.concurrent | Netty |
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| FailedFuture | The CompleteFuture which is failed already. | Class | io.netty.util.concurrent | Netty |
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| FastThreadLocal | A special variant of ThreadLocal that yields higher access performance when accessed from aFastThreadLocalThread. | Class | io.netty.util.concurrent | Netty |
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| FastThreadLocalAccess | Netty's Thread implementations implement this interface to provide fast access to FastThreadLocalSee Also:FastThreadLocalThread | Interface | io.netty.util.concurrent | Netty |
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| FastThreadLocalThread | A special Thread that provides fast access to FastThreadLocal variables. | Class | io.netty.util.concurrent | Netty |
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| Future | The result of an asynchronous operation. | Interface | io.netty.util.concurrent | Netty |
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| FutureListener | A subtype of GenericFutureListener that hides type parameter for convenience. | Interface | io.netty.util.concurrent | Netty |
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| GenericFutureListener | Listens to the result of a Future. | Interface | io.netty.util.concurrent | Netty |
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| GenericProgressiveFutureListener | | Interface | io.netty.util.concurrent | Netty |
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| GlobalEventExecutor | Single-thread singleton EventExecutor. | Class | io.netty.util.concurrent | Netty |
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| HashedWheelTimer | A Timer optimized for approximated I/O timeout scheduling. | Class | io.netty.util | Netty |
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| IllegalReferenceCountException | An IllegalStateException which is raised when a user attempts to access a ReferenceCounted whosereference count has been decreased to 0 (and consequently freed). | Class | io.netty.util | Netty |
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| ImmediateEventExecutor | AbstractEventExecutor which execute tasks in the callers thread. | Class | io.netty.util.concurrent | Netty |
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| ImmediateExecutor | Executor which execute tasks in the callers thread. | Class | io.netty.util.concurrent | Netty |
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| IntObjectHashMap | A hash map implementation of IntObjectMap that uses open addressing for keys. | Class | io.netty.util.collection | Netty |
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| IntObjectMap | Interface for a primitive map that uses ints as keys. | Interface | io.netty.util.collection | Netty |
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| IntObjectMap .Entry | An Entry in the map. | Interface | io.netty.util.collection.IntObjectMap | Netty |
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| Mapping | Maintains the mapping from the objects of one type to the objects of the other type. | Interface | io.netty.util | Netty |
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| MultithreadEventExecutorGroup | | Class | io.netty.util.concurrent | Netty |
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| NetUtil | A class that holds a number of network-related constants. | Class | io.netty.util | Netty |
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| PausableEventExecutor | | Interface | io.netty.util.concurrent | Netty |
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| PrimitiveCollections | Utility methods for primitive collections. | Class | io.netty.util.collection | Netty |
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| ProgressiveFuture | A Future which is used to indicate the progress of an operation. | Interface | io.netty.util.concurrent | Netty |
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| ProgressivePromise | Special ProgressiveFuture which is writable. | Interface | io.netty.util.concurrent | Netty |
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| Promise | Special Future which is writable. | Interface | io.netty.util.concurrent | Netty |
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| PromiseAggregator | GenericFutureListener implementation which consolidates multiple Futuresinto one, by listening to individual Futures and producing an aggregated result | Class | io.netty.util.concurrent | Netty |
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| PromiseNotifier | GenericFutureListener implementation which takes other Futuresand notifies them on completion. | Class | io.netty.util.concurrent | Netty |
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| Recycler | Light-weight object pool based on a thread-local stack. | Class | io.netty.util | Netty |
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| ReferenceCounted | A reference-counted object that requires explicit deallocation. | Interface | io.netty.util | Netty |
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| ReferenceCountUtil | Collection of method to handle objects that may implement ReferenceCounted. | Class | io.netty.util | Netty |
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| ResourceLeak | | Interface | io.netty.util | Netty |
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| ResourceLeakDetector | | Class | io.netty.util | Netty |
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| ResourceLeakDetector .Level | Represents the level of resource leak detection. | Class | io.netty.util.ResourceLeakDetector | Netty |
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| ResourceLeakHint | A hint object that provides human-readable message for easier resource leak tracking. | Interface | io.netty.util | Netty |
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| ScheduledFuture | The result of an scheduled asynchronous operation. | Interface | io.netty.util.concurrent | Netty |
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| Signal | A special Error which is used to signal some state or request by throwing it. | Class | io.netty.util | Netty |
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| SingleThreadEventExecutor | Abstract base class for EventExecutor's that execute all its submitted tasks in a single thread. | Class | io.netty.util.concurrent | Netty |
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| SucceededFuture | The CompleteFuture which is succeeded already. | Class | io.netty.util.concurrent | Netty |
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| ThreadDeathWatcher | Checks if a thread is alive periodically and runs a task when a thread dies. | Class | io.netty.util | Netty |
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| ThreadPerTaskExecutor | | Class | io.netty.util.concurrent | Netty |
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| Timeout | | Interface | io.netty.util | Netty |
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| Timer | | Interface | io.netty.util | Netty |
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| TimerTask | A task which is executed after the delay specified withTimer. | Interface | io.netty.util | Netty |
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| Version | Retrieves the version information of available Netty artifacts. | Class | io.netty.util | Netty |
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| WrappedEventExecutor | A marker interface indicating that the EventExecutor is a wrapper aroundanother EventExecutor implementation. | Interface | io.netty.util.concurrent | Netty |