[[olingo4-component]]
= Olingo4 Component
:docTitle: Olingo4
:artifactId: camel-olingo4
:description: Communicate with OData 4.0 services using Apache Olingo OData API.
:since: 2.19
:supportLevel: Stable
:component-header: Both producer and consumer are supported
include::{cq-version}@camel-quarkus:ROOT:partial$reference/components/olingo4.adoc[opts=optional]

*Since Camel {since}*

*{component-header}*

The Olingo4 component utilizes http://olingo.apache.org/[Apache Olingo]
version 4.0 APIs to interact with OData 4.0 compliant service.
Since version 4.0 OData is OASIS standard and number of popular open source 
and commercial vendors and products support this protocol.
A sample list of supporting products can be found on the OData 
http://www.odata.org/ecosystem/[website].

The Olingo4 component supports reading entity sets, entities,
simple and complex properties, counts, using custom and OData
system query parameters. It supports updating entities and properties.
It also supports submitting queries and change requests as a single OData batch operation. 

The component supports configuring HTTP connection parameters and
headers for OData service connection. This allows configuring use of
SSL, OAuth2.0, etc. as required by the target OData service. 

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

[source,xml]
----
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-olingo4</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
----

== URI format

----
olingo4://endpoint/<resource-path>?[options]
----

== Olingo4 Options


// component options: START
The Olingo4 component supports 16 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *configuration* (common) | To use the shared configuration |  | Olingo4Configuration
| *connectTimeout* (common) | HTTP connection creation timeout in milliseconds, defaults to 30,000 (30 seconds) | 30000 | int
| *contentType* (common) | Content-Type header value can be used to specify JSON or XML message format, defaults to application/json;charset=utf-8 | application/json;charset=utf-8 | String
| *filterAlreadySeen* (common) | Set this to true to filter out results that have already been communicated by this component. | false | boolean
| *httpHeaders* (common) | Custom HTTP headers to inject into every request, this could include OAuth tokens, etc. |  | Map
| *proxy* (common) | HTTP proxy server configuration |  | HttpHost
| *serviceUri* (common) | Target OData service base URI, e.g. \http://services.odata.org/OData/OData.svc |  | String
| *socketTimeout* (common) | HTTP request timeout in milliseconds, defaults to 30,000 (30 seconds) | 30000 | int
| *bridgeErrorHandler* (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean
| *splitResult* (consumer) | For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages, unless splitResult is set to false. | true | boolean
| *lazyStartProducer* (producer) | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | boolean
| *autowiredEnabled* (advanced) | Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. | true | boolean
| *httpAsyncClientBuilder* (advanced) | Custom HTTP async client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely |  | HttpAsyncClientBuilder
| *httpClientBuilder* (advanced) | Custom HTTP client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely |  | HttpClientBuilder
| *sslContextParameters* (security) | To configure security using SSLContextParameters |  | SSLContextParameters
| *useGlobalSslContextParameters* (security) | Enable usage of global SSL context parameters. | false | boolean
|===
// component options: END






// endpoint options: START
The Olingo4 endpoint is configured using URI syntax:

----
olingo4:apiName/methodName
----

with the following path and query parameters:

=== Path Parameters (2 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *apiName* | *Required* What kind of operation to perform. There are 1 enums and the value can be one of: DEFAULT |  | Olingo4ApiName
| *methodName* | *Required* What sub operation to use for the selected operation |  | String
|===


=== Query Parameters (33 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *connectTimeout* (common) | HTTP connection creation timeout in milliseconds, defaults to 30,000 (30 seconds) | 30000 | int
| *contentType* (common) | Content-Type header value can be used to specify JSON or XML message format, defaults to application/json;charset=utf-8 | application/json;charset=utf-8 | String
| *filterAlreadySeen* (common) | Set this to true to filter out results that have already been communicated by this component. | false | boolean
| *httpHeaders* (common) | Custom HTTP headers to inject into every request, this could include OAuth tokens, etc. |  | Map
| *inBody* (common) | Sets the name of a parameter to be passed in the exchange In Body |  | String
| *proxy* (common) | HTTP proxy server configuration |  | HttpHost
| *serviceUri* (common) | Target OData service base URI, e.g. \http://services.odata.org/OData/OData.svc |  | String
| *socketTimeout* (common) | HTTP request timeout in milliseconds, defaults to 30,000 (30 seconds) | 30000 | int
| *bridgeErrorHandler* (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean
| *sendEmptyMessageWhenIdle* (consumer) | If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead. | false | boolean
| *splitResult* (consumer) | For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages, unless splitResult is set to false. | true | boolean
| *exceptionHandler* (consumer) | To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. |  | ExceptionHandler
| *exchangePattern* (consumer) | Sets the exchange pattern when the consumer creates an exchange. There are 3 enums and the value can be one of: InOnly, InOut, InOptionalOut |  | ExchangePattern
| *pollStrategy* (consumer) | A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel. |  | PollingConsumerPollStrategy
| *lazyStartProducer* (producer) | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | boolean
| *httpAsyncClientBuilder* (advanced) | Custom HTTP async client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely |  | HttpAsyncClientBuilder
| *httpClientBuilder* (advanced) | Custom HTTP client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely |  | HttpClientBuilder
| *synchronous* (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean
| *backoffErrorThreshold* (scheduler) | The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in. |  | int
| *backoffIdleThreshold* (scheduler) | The number of subsequent idle polls that should happen before the backoffMultipler should kick-in. |  | int
| *backoffMultiplier* (scheduler) | To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured. |  | int
| *delay* (scheduler) | Milliseconds before the next poll. | 500 | long
| *greedy* (scheduler) | If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages. | false | boolean
| *initialDelay* (scheduler) | Milliseconds before the first poll starts. | 1000 | long
| *repeatCount* (scheduler) | Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever. | 0 | long
| *runLoggingLevel* (scheduler) | The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that. There are 6 enums and the value can be one of: TRACE, DEBUG, INFO, WARN, ERROR, OFF | TRACE | LoggingLevel
| *scheduledExecutorService* (scheduler) | Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool. |  | ScheduledExecutorService
| *scheduler* (scheduler) | To use a cron scheduler from either camel-spring or camel-quartz component. Use value spring or quartz for built in scheduler | none | Object
| *schedulerProperties* (scheduler) | To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler. |  | Map
| *startScheduler* (scheduler) | Whether the scheduler should be auto started. | true | boolean
| *timeUnit* (scheduler) | Time unit for initialDelay and delay options. There are 7 enums and the value can be one of: NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS | MILLISECONDS | TimeUnit
| *useFixedDelay* (scheduler) | Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details. | true | boolean
| *sslContextParameters* (security) | To configure security using SSLContextParameters |  | SSLContextParameters
|===




=== API Parameters (1 APIs):

The Olingo4 endpoint is an API based component and has additional parameters based on which API name and API method is used.
The API name and API method is located in the endpoint URI as the apiName/methodName path parameters:

----
olingo4:apiName/methodName
----

There are 1 API names as listed in the table below:

[width="100%",cols="2,2,6",options="header"]
|===
| API Name | Type | Description
| *DEFAULT* | Both | Olingo4 Client Api Interface
|===

Each API is documented in the following sections to come.


==== API: DEFAULT

*Both producer and consumer are supported*




The DEFAULT API has 9 method(s) which is represented by the following method signatures
(an API method may have multiple signatures due to overloading):

[source,java]
----

void action(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler);

void batch(org.apache.olingo.commons.api.edm.Edm edm, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler<java.util.List<org.apache.camel.component.olingo4.api.batch.Olingo4BatchResponse>> responseHandler);

void create(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler);

void delete(String resourcePath, java.util.Map<String, String> endpointHttpHeaders, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler<org.apache.olingo.commons.api.http.HttpStatusCode> responseHandler);

void merge(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler);

void patch(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler);

void read(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> queryParams, java.util.Map<String, String> endpointHttpHeaders, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler);

void update(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler);

void uread(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> queryParams, java.util.Map<String, String> endpointHttpHeaders, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler<java.io.InputStream> responseHandler);

----

The DEFAULT API is defined in the syntax as follows:

----
olingo4:DEFAULT/methodName?[parameters]
----

The 9 method(s) is listed in the table below.
(API methods can have a shorthand alias name which can be used in the syntax instead of the name)

[width="100%",cols="2,2,6",options="header"]
|===
| Method | Alias | Description
| *action* |  | Calls a OData action
| *batch* |  | Executes a batch request
| *create* |  | Creates a new OData resource
| *delete* |  | Deletes an OData resource and invokes callback with org
| *merge* |  | Patches/merges an OData resource using HTTP MERGE
| *patch* |  | Patches/merges an OData resource using HTTP PATCH
| *read* |  | Reads an OData resource and invokes callback with appropriate result
| *update* |  | Updates an OData resource
| *uread* |  | Reads an OData resource and invokes callback with the unparsed input stream
|===

The DEFAULT API method(s) has the following set of parameters listed in the table below:
[width="100%",cols="2,2,4,2",options="header"]
|===
| Method | Parameter | Description | Type
| action | *data* | *Optional*  Action data | Object
| action | *edm* | *Optional*  Service Edm | Edm
| action | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| action | *resourcePath* |  Resource path to action | String
| action | *responseHandler* | *Optional*  Org.apache.olingo.client.api.domain.ClientEntity callback handler | Olingo4ResponseHandler
| batch | *data* | *Optional*  Ordered org.apache.camel.component.olingo4.api.batch.Olingo4BatchRequest list | Object
| batch | *edm* | *Optional*  Service Edm | Edm
| batch | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| batch | *responseHandler* | *Optional*  Callback handler | Olingo4ResponseHandler
| create | *data* | *Optional*  Request data | Object
| create | *edm* | *Optional*  Service Edm | Edm
| create | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| create | *resourcePath* |  Resource path to create | String
| create | *responseHandler* | *Optional*  Callback handler | Olingo4ResponseHandler
| delete | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| delete | *resourcePath* |  Resource path for Entry | String
| delete | *responseHandler* | *Optional*  Org.apache.olingo.commons.api.http.HttpStatusCode callback handler | Olingo4ResponseHandler
| merge | *data* | *Optional*  Patch/merge data | Object
| merge | *edm* | *Optional*  Service Edm | Edm
| merge | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| merge | *resourcePath* |  Resource path to update | String
| merge | *responseHandler* | *Optional*  Org.apache.olingo.client.api.domain.ClientEntity callback handler | Olingo4ResponseHandler
| patch | *data* | *Optional*  Patch/merge data | Object
| patch | *edm* | *Optional*  Service Edm | Edm
| patch | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| patch | *resourcePath* |  Resource path to update | String
| patch | *responseHandler* | *Optional*  Org.apache.olingo.client.api.domain.ClientEntity callback handler | Olingo4ResponseHandler
| read | *edm* | *Optional*  Service Edm, read from calling read(null, $metdata, null, responseHandler) | Edm
| read | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| read | *queryParams* | *Optional*  OData query params \http://docs.oasis-open.org/odata/odata/v4.0/odata-v4.0-part1-protocol.html#_Toc453752288 | Map
| read | *resourcePath* |  OData Resource path | String
| read | *responseHandler* | *Optional*  Callback handler | Olingo4ResponseHandler
| update | *data* | *Optional*  Updated data | Object
| update | *edm* | *Optional*  Service Edm | Edm
| update | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| update | *resourcePath* |  Resource path to update | String
| update | *responseHandler* | *Optional*  Org.apache.olingo.client.api.domain.ClientEntity callback handler | Olingo4ResponseHandler
| uread | *edm* | *Optional*  Service Edm, read from calling read(null, $metdata, null, responseHandler) | Edm
| uread | *endpointHttpHeaders* | *Optional*  HTTP Headers to add/override the component versions | Map
| uread | *queryParams* | *Optional*  OData query params \http://docs.oasis-open.org/odata/odata/v4.0/odata-v4.0-part1-protocol.html#_Toc453752288 | Map
| uread | *resourcePath* |  OData Resource path | String
| uread | *responseHandler* | *Optional*  Callback handler | Olingo4ResponseHandler
|===

In addition to the parameters above, the DEFAULT API can also use from the 33 endpoint query option
which is listed in the _Query Parameters_ section.

Any of the parameters can be provided in either the endpoint URI, or dynamically in a message header.
The message header name must be of the format `CamelOlingo4.parameter`.
The `inBody` parameter overrides message header, i.e. the endpoint parameter `inBody=myParameterNameHere`
would override a `CamelOlingo4.myParameterNameHere` header.
// endpoint options: END

== Endpoint HTTP Headers

The component level configuration property **httpHeaders** supplies static HTTP header information.
However, some systems requires dynamic header information to be passed to and received from the endpoint.
A sample use case would be systems that require dynamic security tokens.  The **endpointHttpHeaders** 
and **responseHttpHeaders** endpoint properties provides this capability.  Set headers that need to 
be passed to the endpoint in the *`CamelOlingo4.endpointHttpHeaders`* property and the 
response headers will be returned in a *`CamelOlingo4.responseHttpHeaders`* property.  
Both properties are of the type *`java.util.Map<String, String>`*.

== OData Resource Type Mapping

The result of *read* endpoint and data type of *data* option depends on
the OData resource being queried, created or modified. 

[width="100%",cols="10%,10%,80%",options="header",]
|=======================================================================
|OData Resource Type |Resource URI from resourcePath and keyPredicate |In or Out Body Type

|Entity data model |$metadata |org.apache.olingo.commons.api.edm.Edm

|Service document |/ |org.apache.olingo.client.api.domain.ClientServiceDocument

|OData entity set |<entity-set> |org.apache.olingo.client.api.domain.ClientEntitySet

|OData entity |<entity-set>(<key-predicate>) |org.apache.olingo.client.api.domain.ClientEntity for Out body (response)
java.util.Map<String, Object> for In body (request)

|Simple property |<entity-set>(<key-predicate>)/<simple-property> |org.apache.olingo.client.api.domain.ClientPrimitiveValue

|Simple property value |<entity-set>(<key-predicate>)/<simple-property>/$value |org.apache.olingo.client.api.domain.ClientPrimitiveValue

|Complex property |<entity-set>(<key-predicate>)/<complex-property> |org.apache.olingo.client.api.domain.ClientComplexValue

|Count |<resource-uri>/$count |java.lang.Long
|=======================================================================

== Samples

The following route reads top 5 entries from the People entity
ordered by ascending FirstName property. 

[source,java]
------------------------------------------------------------
from("direct:...")
    .setHeader("CamelOlingo4.$top", "5");
    .to("olingo4://read/People?orderBy=FirstName%20asc");
------------------------------------------------------------

The following route reads Airports entity using the key property
value in incoming *id* header. 

[source,java]
------------------------------------------------------------
from("direct:...")
    .setHeader("CamelOlingo4.keyPredicate", header("id"))
    .to("olingo4://read/Airports");
------------------------------------------------------------

The following route creates People entity using the
*ClientEntity* in body message. 

[source,java]
------------------------------------------------------------
from("direct:...")
    .to("olingo4://create/People");
------------------------------------------------------------

The following route calls an odata action using the *ClientEntity* in the body message. The body message may be null for
actions that don't expect an input.

[source,java]
------------------------------------------------------------
from("direct:...")
    .to("olingo4://action/People");
------------------------------------------------------------

include::camel-spring-boot::page$olingo4-starter.adoc[]
