Effector

The Effect represents policy rule outcomes, while the Effector interface manages effect handling within Casbin.

MergeEffects()

The MergeEffects() function consolidates all matching results gathered by the enforcer into one final decision.

例如：

Effect, explainIndex, err = e.MergeEffects(expr, effects, matches, policyIndex, policyLength)

Explanation of parameters:

• Effect represents the final merged decision (initialized as Indeterminate).
• explainIndex holds the eft index (Allow or Deny), initialized at -1.
• err verifies effect support.
• expr contains the string representation of policy effects.
• effects is an array containing Allow, Indeterminate, or Deny values.
• matches indicates which results match policies.
• policyIndex identifies the policy position in the model.
• policyLength specifies the policy count.

The example demonstrates parameter passing to MergeEffects(), which processes effects and matches according to the expr.

To utilize the Effector:

var e Effector
Effect, explainIndex, err = e.MergeEffects(expr, effects, matches, policyIndex, policyLength)

The core concept of MergeEffects(): when expr matches results indicating p_eft is allow, effects merge together. Absent deny rule matches result in an allow decision.

备注

When expr doesn't match "priority(p_eft) || deny" and policyIndex is less than policyLength-1, short-circuiting occurs, skipping intermediate effects.