{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://spring.io/projects/spring-integration/schemas/message",
  "title": "Spring Integration Message",
  "description": "Represents a Spring Integration message comprising a payload and message headers",
  "type": "object",
  "required": ["payload"],
  "properties": {
    "payload": {
      "description": "The message payload - can be any type",
      "oneOf": [
        { "type": "string" },
        { "type": "object" },
        { "type": "array" },
        { "type": "number" },
        { "type": "boolean" }
      ]
    },
    "headers": {
      "$ref": "#/definitions/MessageHeaders"
    }
  },
  "definitions": {
    "MessageHeaders": {
      "title": "Spring Integration Message Headers",
      "description": "Standard and custom headers attached to a Spring Integration message",
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "format": "uuid",
          "description": "Unique message identifier"
        },
        "timestamp": {
          "type": "integer",
          "description": "Message creation timestamp in milliseconds since epoch"
        },
        "contentType": {
          "type": "string",
          "description": "MIME type of the payload"
        },
        "correlationId": {
          "description": "Correlation identifier linking related messages"
        },
        "replyChannel": {
          "type": "string",
          "description": "Channel name or bean reference for sending replies"
        },
        "errorChannel": {
          "type": "string",
          "description": "Channel name or bean reference for error messages"
        },
        "sequenceNumber": {
          "type": "integer",
          "description": "Position in a split/aggregated message sequence"
        },
        "sequenceSize": {
          "type": "integer",
          "description": "Total number of messages in a sequence"
        },
        "sequenceDetails": {
          "type": "array",
          "description": "Nested sequence tracking for nested splits"
        },
        "expiration": {
          "type": "integer",
          "description": "Message expiration timestamp"
        },
        "priority": {
          "type": "integer",
          "description": "Message priority for priority queues"
        }
      },
      "additionalProperties": true
    },
    "IntegrationChannel": {
      "title": "Spring Integration Channel Statistics",
      "description": "Runtime statistics for a Spring Integration message channel",
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "description": "Channel bean name"
        },
        "type": {
          "type": "string",
          "enum": [
            "DirectChannel",
            "QueueChannel",
            "PublishSubscribeChannel",
            "ExecutorChannel",
            "PriorityChannel",
            "RendezvousChannel",
            "NullChannel"
          ],
          "description": "Channel implementation type"
        },
        "sendCount": {
          "type": "integer",
          "format": "int64",
          "description": "Total number of successful sends"
        },
        "sendErrorCount": {
          "type": "integer",
          "format": "int64",
          "description": "Total number of failed sends"
        },
        "meanSendDuration": {
          "type": "number",
          "description": "Mean send duration in milliseconds"
        },
        "minSendDuration": {
          "type": "number"
        },
        "maxSendDuration": {
          "type": "number"
        },
        "queueSize": {
          "type": "integer",
          "description": "Current queue depth (for QueueChannel)"
        },
        "remainingCapacity": {
          "type": "integer",
          "description": "Remaining queue capacity"
        }
      }
    }
  }
}