[[aws-cw-component]]
= AWS CloudWatch Component

*Available as of Camel version 2.11*


The CW component allows messages to be sent to an
http://aws.amazon.com/cloudwatch/[Amazon CloudWatch] metrics. The
implementation of the Amazon API is provided by
the http://aws.amazon.com/sdkforjava/[AWS SDK].

Prerequisites

You must have a valid Amazon Web Services developer account, and be
signed up to use Amazon CloudWatch. More information are available at
http://aws.amazon.com/cloudwatch/[Amazon CloudWatch].

== URI Format

[source,java]
----------------------------
aws-cw://namespace[?options]
----------------------------

The metrics will be created if they don't already exists.

 You can append query options to the URI in the following format,
`?options=value&option2=value&...`

== URI Options


// component options: START
The AWS CloudWatch component supports 5 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *configuration* (advanced) | The AWS CW default configuration |  | CwConfiguration
| *accessKey* (producer) | Amazon AWS Access Key |  | String
| *secretKey* (producer) | Amazon AWS Secret Key |  | String
| *region* (producer) | The region in which CW client needs to work |  | String
| *resolveProperty Placeholders* (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean
|===
// component options: END




// endpoint options: START
The AWS CloudWatch endpoint is configured using URI syntax:

----
aws-cw:namespace
----

with the following path and query parameters:

=== Path Parameters (1 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *namespace* | *Required* The metric namespace |  | String
|===


=== Query Parameters (11 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *amazonCwClient* (producer) | To use the AmazonCloudWatch as the client |  | AmazonCloudWatch
| *name* (producer) | The metric name |  | String
| *proxyHost* (producer) | To define a proxy host when instantiating the CW client |  | String
| *proxyPort* (producer) | To define a proxy port when instantiating the CW client |  | Integer
| *region* (producer) | The region in which CW client needs to work |  | String
| *timestamp* (producer) | The metric timestamp |  | Date
| *unit* (producer) | The metric unit |  | String
| *value* (producer) | The metric value |  | Double
| *synchronous* (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean
| *accessKey* (security) | Amazon AWS Access Key |  | String
| *secretKey* (security) | Amazon AWS Secret Key |  | String
|===
// endpoint options: END
// spring-boot-auto-configure options: START
== Spring Boot Auto-Configuration

When using Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

[source,xml]
----
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-aws-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>
----


The component supports 16 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *camel.component.aws-cw.access-key* | Amazon AWS Access Key |  | String
| *camel.component.aws-cw.configuration.access-key* | Amazon AWS Access Key |  | String
| *camel.component.aws-cw.configuration.amazon-cw-client* | To use the AmazonCloudWatch as the client |  | AmazonCloudWatch
| *camel.component.aws-cw.configuration.name* | The metric name |  | String
| *camel.component.aws-cw.configuration.namespace* | The metric namespace |  | String
| *camel.component.aws-cw.configuration.proxy-host* | To define a proxy host when instantiating the CW client |  | String
| *camel.component.aws-cw.configuration.proxy-port* | To define a proxy port when instantiating the CW client |  | Integer
| *camel.component.aws-cw.configuration.region* | The region in which CW client needs to work |  | String
| *camel.component.aws-cw.configuration.secret-key* | Amazon AWS Secret Key |  | String
| *camel.component.aws-cw.configuration.timestamp* | The metric timestamp |  | Date
| *camel.component.aws-cw.configuration.unit* | The metric unit |  | String
| *camel.component.aws-cw.configuration.value* | The metric value |  | Double
| *camel.component.aws-cw.enabled* | Enable aws-cw component | true | Boolean
| *camel.component.aws-cw.region* | The region in which CW client needs to work |  | String
| *camel.component.aws-cw.resolve-property-placeholders* | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | Boolean
| *camel.component.aws-cw.secret-key* | Amazon AWS Secret Key |  | String
|===
// spring-boot-auto-configure options: END




Required CW component options

You have to provide the amazonCwClient in the
Registry or your accessKey and secretKey to access
the http://aws.amazon.com/cloudwatch/[Amazon's CloudWatch].

== Usage

=== Message headers evaluated by the CW producer

[width="100%",cols="10%,10%,80%",options="header",]
|=======================================================================
|Header |Type |Description

|`CamelAwsCwMetricName` |`String` |The Amazon CW metric name.

|`CamelAwsCwMetricValue` |`Double` |The Amazon CW metric value.

|`CamelAwsCwMetricUnit` |`String` |The Amazon CW metric unit.

|`CamelAwsCwMetricNamespace` |`String` |The Amazon CW metric namespace.

|`CamelAwsCwMetricTimestamp` |`Date` |The Amazon CW metric timestamp.

|`CamelAwsCwMetricDimensionName` |`String` |*Camel 2.12:* The Amazon CW metric dimension name.

|`CamelAwsCwMetricDimensionValue` |`String` |*Camel 2.12:* The Amazon CW metric dimension value.

|`CamelAwsCwMetricDimensions` |`Map<String, String>` |*Camel 2.12:* A map of dimension names and dimension values.
|=======================================================================

=== Advanced AmazonCloudWatch configuration

If you need more control over the `AmazonCloudWatch` instance
configuration you can create your own instance and refer to it from the
URI:

[source,java]
-------------------------------------------------
from("direct:start")
.to("aws-cw://namepsace?amazonCwClient=#client");
-------------------------------------------------

The `#client` refers to a `AmazonCloudWatch` in the
Registry.

For example if your Camel Application is running behind a firewall:

[source,java]
------------------------------------------------------------------------------------------
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonCloudWatch client = new AmazonCloudWatchClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
------------------------------------------------------------------------------------------

== Dependencies

Maven users will need to add the following dependency to their pom.xml.

*pom.xml*

[source,xml]
---------------------------------------
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
---------------------------------------

where `$\{camel-version\}` must be replaced by the actual version of Camel
(2.10 or higher).