Class: Aerospike::Policy

Inherits:
Object
  • Object
show all
Defined in:
lib/aerospike/policy/policy.rb

Overview

Container object for client policy command.

Direct Known Subclasses

BatchPolicy, QueryPolicy, ScanPolicy, WritePolicy

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opt = {}) ⇒ Policy

Returns a new instance of Policy.



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# File 'lib/aerospike/policy/policy.rb', line 29

def initialize(opt={})
  # Container object for transaction policy attributes used in all database
  # operation calls.

  # Priority of request relative to other transactions.
  # Currently, only used for scans.
  @priority = opt[:priority] || Priority::DEFAULT

  # Set optional predicate expression filters in postfix notation.
  # Predicate expression filters are applied on the query results on the server.
  # Predicate expression filters may occur on any bin in the record.
  # Requires Aerospike Server versions >= 3.12
  #
  # Postfix notation is described here: http://wiki.c2.com/?PostfixNotation
  #
  # Example:
  #
  # (c >= 11 and c <= 20) or (d > 3 and (d < 5)
  # policy.predexp = [
  #   PredExp.integer_bin("c"),
  #   PredExp.integer_value(11),
  #   PredExp.integer_greater_eq(),
  #   PredExp.integer_bin("c"),
  #   PredExp.integer_value(20),
  #   PredExp.integer_less_eq(),
  #   PredExp.and(2),
  #   PredExp.integer_bin("d"),
  #   PredExp.integer_value(3),
  #   PredExp.integer_greater(),
  #   PredExp.integer_bin("d"),
  #   PredExp.integer_value(5),
  #   PredExp.integer_less(),
  #   PredExp.and(2),
  #   PredExp.or(2)
  # ]
  #
  # # Record last update time > 2017-01-15
  # policy.predexp = [
  #   PredExp.rec_last_update(),
  #   PredExp.integer_value(Time.new(2017, 1, 15).to_i),
  #   PredExp.integer_greater(),
  #   PredExp.integer_greater()
  # ]
  @predexp = opt[:predexp] || nil


  # Throw exception if @predexp is defined and that filter evaluates
  # to false (transaction ignored). The Aerospike::Exceptions::Aerospike
  # will contain result code Aerospike::ResultCode::FILTERED_OUT.
  # This field is not applicable to batch, scan or query commands.
  @fail_on_filtered_out = opt[:fail_on_filtered_out] || false

  # How replicas should be consulted in a read operation to provide the desired
  # consistency guarantee. Default to allowing one replica to be used in the
  # read operation.
  @consistency_level = opt[:consistency_level] || Aerospike::ConsistencyLevel::CONSISTENCY_ONE


  # Send read commands to the node containing the key's partition replica type.
  # Write commands are not affected by this setting, because all writes are directed 
  # to the node containing the key's master partition.
  #
  # Default to sending read commands to the node containing the key's master partition.
  @replica = opt[:replica] || Aerospike::Replica::MASTER

  # Use zlib compression on write or batch read commands when the command buffer size is greater
  # than 128 bytes. In addition, tell the server to compress its response on read commands.
  # The server response compression threshold is also 128 bytes.
  #
  # This option will increase cpu and memory usage (for extra compressed buffers), but
  # decrease the size of data sent over the network.
  @use_compression = opt[:use_compression] || false

  # Transaction timeout.
  # This timeout is used to set the socket timeout and is also sent to the
  # server along with the transaction in the wire protocol.
  # Default to no timeout (0).
  @timeout = opt[:timeout] || 0

  # Maximum number of retries before aborting the current transaction.
  # A retry is attempted when there is a network error other than timeout.
  # If max_retries is exceeded, the abort will occur even if the timeout
  # has not yet been exceeded.
  @max_retries = opt[:max_retries] || 2

  # Duration to sleep between retries if a transaction fails and the
  # timeout was not exceeded. Enter zero to skip sleep.
  @sleep_between_retries = opt[:sleep_between_retries] || 0.5
end

Instance Attribute Details

#consistency_level ⇒ Object

Returns the value of attribute consistency_level.



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# File 'lib/aerospike/policy/policy.rb', line 26

def consistency_level
  @consistency_level
end

#fail_on_filtered_out ⇒ Object

Returns the value of attribute fail_on_filtered_out.



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# File 'lib/aerospike/policy/policy.rb', line 26

def fail_on_filtered_out
  @fail_on_filtered_out
end

#max_retries ⇒ Object

Returns the value of attribute max_retries.



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# File 'lib/aerospike/policy/policy.rb', line 26

def max_retries
  @max_retries
end

#predexp ⇒ Object

Returns the value of attribute predexp.



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# File 'lib/aerospike/policy/policy.rb', line 26

def predexp
  @predexp
end

#priority ⇒ Object

Returns the value of attribute priority.



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# File 'lib/aerospike/policy/policy.rb', line 26

def priority
  @priority
end

#replica ⇒ Object

Returns the value of attribute replica.



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# File 'lib/aerospike/policy/policy.rb', line 26

def replica
  @replica
end

#sleep_between_retries ⇒ Object

Returns the value of attribute sleep_between_retries.



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# File 'lib/aerospike/policy/policy.rb', line 26

def sleep_between_retries
  @sleep_between_retries
end

#timeout ⇒ Object

Returns the value of attribute timeout.



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# File 'lib/aerospike/policy/policy.rb', line 26

def timeout
  @timeout
end

#use_compression ⇒ Object

Returns the value of attribute use_compression.



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# File 'lib/aerospike/policy/policy.rb', line 26

def use_compression
  @use_compression
end