Packages

t

molecule.core.generic

GenericLog

trait GenericLog extends AnyRef

Log interface.

Datomic's database log is a recording of all transaction data in historic order, organized for efficient access by transaction.

Instantiate Log object with tx range arguments between from (inclusive) and until (exclusive), and add Log attributes to be returned as tuples of data:

// Data from transaction t1 until t4 (exclusive)
Log(Some(t1), Some(t4)).t.e.a.v.op.get === List(
  (t1, e1, ":Person/name", "Ben", true),
  (t1, e1, ":Person/age", 41, true),

  (t2, e2, ":Person/name", "Liz", true),
  (t2, e2, ":Person/age", 37, true),

  (t3, e1, ":Person/age", 41, false),
  (t3, e1, ":Person/age", 42, true)
)

// If `from` is None, the range starts from the beginning
Log(None, Some(t3)).v.e.t.get === List(
  (t1, e1, ":Person/name", "Ben", true),
  (t1, e1, ":Person/age", 41, true),

  (t2, e2, ":Person/name", "Liz", true),
  (t2, e2, ":Person/age", 37, true)

  // t3 not included
)

// If `until` is None, the range goes to the end
Log(Some(t2), None).v.e.t.get === List(
  // t1 not included

  (t2, e2, ":Person/name", "Liz", true),
  (t2, e2, ":Person/age", 37, true),

  (t3, e1, ":Person/age", 41, false),
  (t3, e1, ":Person/age", 42, true)
)

Log attributes available:

  • e - Entity id (Long)
  • a - Full attribute name like ":Person/name" (String)
  • v - Value of Datoms (Any)
  • t - Transaction pointer (Long/Int)
  • tx - Transaction entity id (Long)
  • txInstant - Transaction wall clock time (java.util.Date)
  • op - Operation status: assertion (true) / retraction (false)
Source
GenericLog.scala
Note

Contrary to the Datomic Log which is map of individual transactions the Molecule Log implementation is flattened to be one continuous list of transaction data. This is to have a transparent unified return type as all other molecules returning data. Data can always be grouped if needed.

Linear Supertypes
AnyRef, Any
Known Subclasses
api, api, in1_out1, in1_out10, in1_out11, in1_out12, in1_out13, in1_out14, in1_out15, in1_out16, in1_out17, in1_out18, in1_out19, in1_out2, in1_out20, in1_out21, in1_out22, in1_out3, in1_out4, in1_out5, in1_out6, in1_out7, in1_out8, in1_out9, in2_out1, in2_out10, in2_out11, in2_out12, in2_out13, in2_out14, in2_out15, in2_out16, in2_out17, in2_out18, in2_out19, in2_out2, in2_out20, in2_out21, in2_out22, in2_out3, in2_out4, in2_out5, in2_out6, in2_out7, in2_out8, in2_out9, in3_out1, in3_out10, in3_out11, in3_out12, in3_out13, in3_out14, in3_out15, in3_out16, in3_out17, in3_out18, in3_out19, in3_out2, in3_out20, in3_out21, in3_out22, in3_out3, in3_out4, in3_out5, in3_out6, in3_out7, in3_out8, in3_out9, out1, out10, out11, out12, out13, out14, out15, out16, out17, out18, out19, out2, out20, out21, out22, out3, out4, out5, out6, out7, out8, out9
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  20. object Log extends Log_0_0_L0[Log_, Init] with FirstNS

    Log object to start Log molecule.

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