Apache Camel: Weather

Weather Component

Available as of Camel 2.12

The weather: component is used for polling weather information from Open Weather Map - a site that provides free global weather and forecast information. The information is returned as a json String object.

Camel will poll for updates to the current weather and forecasts once per hour by default. It can also be used to query the weather api based on the parameters defined on the endpoint which is used as producer.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-weather</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

weather://<unused name>[?options]

REMARK

Since the 9th of October, an Api Key is required to access the openweather service. This key is passed as parameter to the URI definition of the weather endpoint using the appid param !

Options

Property	Default	Description
`appid`	null	Camel 2.16.1/2.15.5: APPID ID used to authenticate the user connected to the API Server. This key is required.
`location`	`null`	If null Camel will try and determine your current location using the geolocation of your ip address, else specify the city,country. For well known city names, Open Weather Map will determine the best fit, but multiple results may be returned. Hence specifying and country as well will return more accurate data. If you specify "current" as the location then the component will try to get the current latitude and longitude and use that to get the weather details. You can use lat and lon options instead of location.
`lat`	`null`	Latitude of location. You can use lat and lon options instead of location.
`lon`	`null`	Longitude of location. You can use lat and lon options instead of location.
`period`	`null`	If null, the current weather will be returned, else use values of 5, 7, 14 days. Only the numeric value for the forecast period is actually parsed, so spelling, capitalisation of the time period is up to you (its ignored)
`headerName`	`null`	To store the weather result in this header instead of the message body. This is useable if you want to keep current message body as-is.
`mode`	`JSON`	The output format of the weather data. The possible values are `HTML`, `JSON` or `XML`
`units`	`METRIC`	The units for temperature measurement. The possible values are `IMPERIAL` or `METRIC`
`consumer.delay`	`3600000`	Delay in millis between each poll (default is 1 hour)
`consumer.initialDelay`	`1000`	Millis before polling starts.
`consumer.userFixedDelay`	`false`	If `true`, use fixed delay between polls, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.

You can append query options to the URI in the following format, ?option=value&option=value&...

Exchange data format

Camel will deliver the body as a json formatted java.lang.String (see the mode option above).

Message Headers

Header	Description
`CamelWeatherQuery`	The original query URL sent to the Open Weather Map site
`CamelWeatherLocation`	Used by the producer to override the endpoint location and use the location from this header instead.

Samples

In this sample we find the 7 day weather forecast for Madrid, Spain:

from("weather:foo?location=Madrid,Spain&period=7 days&appid=APIKEY").to("jms:queue:weather");

To just find the current weather for your current location you can use this:

from("weather:foo?appid=APIKEY").to("jms:queue:weather");

And to find the weather using the producer we do:

from("direct:start")
  .to("weather:foo?location=Madrid,Spain&appid=APIKEY");

And we can send in a message with a header to get the weather for any location as shown:

  String json = template.requestBodyAndHeader("direct:start", "", "CamelWeatherLocation", "Paris,France&appid=APIKEY", String.class);

And to get the weather at the current location, then:

  String json = template.requestBodyAndHeader("direct:start", "", "CamelWeatherLocation", "current&appid=APIKEY", String.class);

Weather Component

URI format

REMARK

Options

Exchange data format

Message Headers

Samples

Overview

Documentation

Search

Community

Developers

Apache Software Foundation