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# Common REST Client Library
This library provides a single client implementation to be used by micro services for communicating via its REST API.
---
## Usage
In order to make the _REST Client_ library available to your microservice, include the following dependency in your service's pom.xml:
<!-- Common REST Client Library -->
<dependency>
<groupId>org.openecomp.aai</groupId>
<artifactId>rest-client</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
## Code Examples
### Creating and Configuring a Client Instance
In order to start talking to a service, you need to create a client instance and configure it. The _RestClient_ uses a fluent interface which allows it to be both instantiated and configured as in the following example:
// Create an instance of the Rest Client and configure it.
RestClient myClient = new RestClient()
.validateServerHostname(false)
.validateServerCertChain(true)
.clientCertFile("certificate_filename")
.trustStroe("trust_store_filename")
.connectTimeoutMs(1000)
.readTimeoutMs(1000)
Note, that all of the above configuration parameters are optional and will be set to default values if they are not specified.
### Querying The A&AI
Once your service has a client instance, it can query the _Active & Available Inventory_ by specifying an HTTP endpoint, headers, and the expected response format:
MultivaluedMap<String, String> headers = new MultivaluedMapImpl();
headers.put("Accept", Arrays.asList(new String[]{"application/json"}));
headers.put("X-FromAppId", Arrays.asList(new String[]{"APP-ID"}));
headers.put("X-TransactionId", Arrays.asList(new String[]{UUID.randomUUID().toString()}));
OperationResult result = myClient.queryActiveInventory("http://some/endpoint", headers, RestClient.RESPONSE_MIME_TYPE.JSON);
// You can also specify number of re-tries:
int retries = 3
OperationResult result = myClient.queryActiveInventory("http://some/endpoint", headers, RestClient.RESPONSE_MIME_TYPE.JSON, retries);
The result of the query is returned as an _OperationResult_ object, which can be unpacked in the following manner:
The standard HTTP result code received back from the _A&AI_ is accessible as follows:
int resultCode = getResultCode()
The actual result payload is accessible in the following manner:
String resultPayload = result.getResult()
Finally, in the event of a failure, a failure cause message will be populated and can be accessed as follows:
String failureCause = result.getFailureCause()
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