Class: Aws::EndpointCache Private

Inherits:
Object
  • Object
show all
Defined in:
lib/aws-sdk-core/endpoint_cache.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

a LRU cache caching endpoints data

Defined Under Namespace

Classes: Endpoint

Constant Summary collapse

MAX_ENTRIES =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

default cache entries limit

1000
MAX_THREADS =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

default max threads pool size

10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ EndpointCache

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of EndpointCache.


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 14

def initialize(options = {})
  @max_entries = options[:max_entries] || MAX_ENTRIES
  @entries = {} # store endpoints
  @max_threads = options[:max_threads] || MAX_THREADS
  @pool = {} # store polling threads
  @mutex = Mutex.new
  @require_identifier = nil # whether endpoint operation support identifier
end

Instance Attribute Details

#max_entriesInteger (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Max size limit of cache.

Returns:

  • (Integer)

    Max size limit of cache


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 24

def max_entries
  @max_entries
end

#max_threadsInteger (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Max count of polling threads.

Returns:

  • (Integer)

    Max count of polling threads


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 27

def max_threads
  @max_threads
end

#poolObject (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

return [Hash] Polling threads pool


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 30

def pool
  @pool
end

Instance Method Details

#[](key) ⇒ Endpoint

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parameters:

  • key (String)

Returns:


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 34

def [](key)
  @mutex.synchronize do
    # fetching an existing endpoint delete it and then append it
    endpoint = @entries[key]
    if endpoint
      @entries.delete(key)
      @entries[key] = endpoint
    end
    endpoint
  end
end

#[]=(key, value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parameters:

  • key (String)
  • value (Hash)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 48

def []=(key, value)
  @mutex.synchronize do
    # delete the least recent used endpoint when cache is full
    unless @entries.size < @max_entries
      old_key, = @entries.shift
      delete_polling_thread(old_key)
    end
    # delete old value if exists
    @entries.delete(key)
    @entries[key] = Endpoint.new(value.to_hash)
  end
end

#delete(key) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

remove entry only

Parameters:

  • key (String)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 82

def delete(key)
  @mutex.synchronize do
    @entries.delete(key)
  end
end

#delete_polling_thread(key) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

kill the old polling thread and remove it from pool

Parameters:

  • key (String)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 90

def delete_polling_thread(key)
  Thread.kill(@pool[key]) if threads_key?(key)
  @pool.delete(key)
end

#extract_key(ctx) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

extract the key to be used in the cache from request context

Parameters:

  • ctx (RequestContext)

Returns:

  • (String)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 109

def extract_key(ctx)
  parts = []
  # fetching from cred provider directly gives warnings
  parts << ctx.config.credentials.credentials.access_key_id
  if _endpoint_operation_identifier(ctx)
    parts << ctx.operation_name
    ctx.operation.input.shape.members.inject(parts) do |p, (name, ref)|
      p << ctx.params[name] if ref['endpointdiscoveryid']
      p
    end
  end
  parts.join('_')
end

#key?(key) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

checking whether an unexpired endpoint key exists in cache

Parameters:

  • key (String)

Returns:

  • (Boolean)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 64

def key?(key)
  @mutex.synchronize do
    if @entries.key?(key) && (@entries[key].nil? || @entries[key].expired?)
      @entries.delete(key)
    end
    @entries.key?(key)
  end
end

#stop_polling!Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

kill all polling threads


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 135

def stop_polling!
  @pool.each { |_, t| Thread.kill(t) }
  @pool = {}
end

#threads_key?(key) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

checking whether an polling thread exist for the key

Parameters:

  • key (String)

Returns:

  • (Boolean)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 76

def threads_key?(key)
  @pool.key?(key)
end

#update(key, ctx) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

update cache with requests (using service endpoint operation) to fetch endpoint list (with identifiers when available)

Parameters:

  • key (String)
  • ctx (RequestContext)

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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 99

def update(key, ctx)
  resp = _request_endpoint(ctx)
  if resp && resp.endpoints
    resp.endpoints.each { |e| self[key] = e }
  end
end

#update_polling_pool(key, thread) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

update polling threads pool param [String] key param [Thread] thread


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# File 'lib/aws-sdk-core/endpoint_cache.rb', line 126

def update_polling_pool(key, thread)
  unless @pool.size < @max_threads
    _, thread = @pool.shift
    Thread.kill(thread)
  end
  @pool[key] = thread
end