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# Class: Vertx::Pump

Inherits:
  Object
  - Object
  - Vertx::Pump
  show all
Defined in:
  /Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/pump.rb

## Overview

Pumps data from a ReadStream to a WriteStream and performs flow control where necessary to prevent the write stream buffer from getting overfull.

Instances of this class read items from a ReadStream and write them to a WriteStream. If data can be read faster than it can be written this could result in the write queue of the WriteStream growing without bound, eventually causing it to exhaust all available RAM.

To prevent this, after each write, instances of this class check whether the write queue of the WriteStream is full, and if so, the ReadStream is paused, and a `drainHandler` is set on the WriteStream.

When the WriteStream has processed half of its backlog, the `drainHandler` will be called, which results in the pump resuming the ReadStream.

This class can be used to pump from any ReadStream to any WriteStream, e.g. from an HttpServerRequest to an AsyncFile, or from NetSocket to a WebSocket.

Please see the documentation for more information.

## Class Method Summary (collapse)

- + (::Vertx::Pump) pump(rs = nil, ws = nil, writeQueueMaxSize = nil)
  Create a new Pump with the given ReadStream and WriteStream and writeQueueMaxSize.

## Instance Method Summary (collapse)

- - (Fixnum) number_pumped
  Return the total number of items pumped by this pump.
- - (self) set_write_queue_max_size(maxSize = nil)
  Set the write queue max size to maxSize.
- - (self) start
  Start the Pump.
- - (self) stop
  Stop the Pump.

## Class Method Details

### + (`::Vertx::Pump`) pump(rs = nil, ws = nil, writeQueueMaxSize = nil)

Create a new `Pump` with the given `ReadStream` and `WriteStream` and `writeQueueMaxSize`

Parameters:

- rs (`::Vertx::ReadStream`) (defaults to: `nil`) —
  the read stream
- ws (`::Vertx::WriteStream`) (defaults to: `nil`) —
  the write stream
- writeQueueMaxSize (`Fixnum`) (defaults to: `nil`) —
  the max size of the write queue

Returns:

- (`::Vertx::Pump`) —
  the pump

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/pump.rb', line 41

    def self.pump(rs=nil,ws=nil,writeQueueMaxSize=nil)
      if rs.class.method_defined?(:j_del) && ws.class.method_defined?(:j_del) && !block_given? && writeQueueMaxSize == nil
        return ::Vertx::Util::Utils.safe_create(Java::IoVertxCoreStreams::Pump.java_method(:pump, [Java::IoVertxCoreStreams::ReadStream.java_class,Java::IoVertxCoreStreams::WriteStream.java_class]).call(rs.j_del,ws.j_del),::Vertx::Pump)
      elsif rs.class.method_defined?(:j_del) && ws.class.method_defined?(:j_del) && writeQueueMaxSize.class == Fixnum && !block_given?
        return ::Vertx::Util::Utils.safe_create(Java::IoVertxCoreStreams::Pump.java_method(:pump, [Java::IoVertxCoreStreams::ReadStream.java_class,Java::IoVertxCoreStreams::WriteStream.java_class,Java::int.java_class]).call(rs.j_del,ws.j_del,writeQueueMaxSize),::Vertx::Pump)
      end
      raise ArgumentError, "Invalid arguments when calling pump(rs,ws,writeQueueMaxSize)"
    end

## Instance Method Details

### - (`Fixnum`) number_pumped

Return the total number of items pumped by this pump.

Returns:

- (`Fixnum`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/pump.rb', line 79

    def number_pumped
      if !block_given?
        return @j_del.java_method(:numberPumped, []).call()
      end
      raise ArgumentError, "Invalid arguments when calling number_pumped()"
    end

### - (`self`) set_write_queue_max_size(maxSize = nil)

Set the write queue max size to `maxSize`

Parameters:

- maxSize (`Fixnum`) (defaults to: `nil`) —
  the max size

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/pump.rb', line 52

    def set_write_queue_max_size(maxSize=nil)
      if maxSize.class == Fixnum && !block_given?
        @j_del.java_method(:setWriteQueueMaxSize, [Java::int.java_class]).call(maxSize)
        return self
      end
      raise ArgumentError, "Invalid arguments when calling set_write_queue_max_size(maxSize)"
    end

### - (`self`) start

Start the Pump. The Pump can be started and stopped multiple times.

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/pump.rb', line 61

    def start
      if !block_given?
        @j_del.java_method(:start, []).call()
        return self
      end
      raise ArgumentError, "Invalid arguments when calling start()"
    end

### - (`self`) stop

Stop the Pump. The Pump can be started and stopped multiple times.

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/pump.rb', line 70

    def stop
      if !block_given?
        @j_del.java_method(:stop, []).call()
        return self
      end
      raise ArgumentError, "Invalid arguments when calling stop()"
    end