{
  "solverParameters": {
    "timeLimit": "60s"
  },
  "ports": [{
    "id": "port_1",
    "minimumPortStayDuration": {
      "hours": "24"
    },
    "vesselClassCosts": {
      "vessel_1": {
      },
      "vessel_2": {
      }
    }
  }, {
    "id": "port_2",
    "minimumPortStayDuration": {
      "hours": "24"
    },
    "vesselClassCosts": {
      "vessel_1": {
      },
      "vessel_2": {
      }
    }
  }],
  "legCandidates": [{
    "id": "1->2",
    "departurePortId": "port_1",
    "arrivalPortId": "port_2",
    "duration": {
      "hours": "48"
    },
    "vesselClassCosts": {
      "vessel_1": 10.0,
      "vessel_2": 10.0
    }
  }, {
    "id": "2->1",
    "departurePortId": "port_2",
    "arrivalPortId": "port_1",
    "duration": {
      "hours": "72"
    },
    "vesselClassCosts": {
      "vessel_1": 10.0,
      "vessel_2": 10.0
    }
  }],
  "vesselClasses": [{
    "id": "vessel_1",
    "containerCapacity": "1",
    "vesselCount": "2"
  }, {
    "id": "vessel_2",
    "containerCapacity": "2",
    "vesselCount": "1"
  }],
  "commodityDemands": [{
    "id": "1->2",
    "originPortId": "port_1",
    "destinationPortId": "port_2",
    "containerCount": "2",
    "freightRate": 40.0
  }]
}