### Changing object status

```java
import seatsio.SeatsioClient;
import seatsio.Region;

SeatsioClient client = new SeatsioClient(Region.EU, );
client.events.changeObjectStatus(, Arrays.asList("A-1", "A-2"), "unavailable");
```

### Listing all charts

```java
import seatsio.SeatsioClient;
import seatsio.Region;
import seatsio.charts.Chart;

SeatsioClient client = new SeatsioClient(Region.EU, "");

Stream charts = client.charts.listAll();
charts.forEach(chart -> {
System.out.println("Chart " + chart.key());
});
```

Note: `listAll()` returns a stream, which under the hood calls the seats.io API to fetch charts page by page. So multiple API calls may be done underneath to fetch all charts.

### Retrieving object category and status (and other information)

```java
import seatsio.SeatsioClient;
import seatsio.Region;
import seatsio.events.EventObjectInfo;

SeatsioClient client = new SeatsioClient(Region.EU, "");

Map eventObjectInfos = client.events.retrieveObjectInfos(event.key(), List.of("A-1", "A-2"));

System.out.println(eventObjectInfos.get("A-1").categoryLabel());
System.out.println(eventObjectInfos.get("A-1").categoryKey());
System.out.println(eventObjectInfos.get("A-1").status());

System.out.println(eventObjectInfos.get("A-2").categoryLabel());
System.out.println(eventObjectInfos.get("A-2").categoryKey());
System.out.println(eventObjectInfos.get("A-2").status());
```

### Listing charts page by page

E.g. to show charts in a paginated list on a dashboard.

Each page contains an `items` array of charts, and `nextPageStartsAfter` and `previousPageEndsBefore` properties. Those properties are the chart IDs after which the next page starts or the previous page ends.

```java
// ... user initially opens the screen ...

Page firstPage = client.charts.listFirstPage();
for(Chart chart: charts.items) {
System.out.println("Chart " + chart.key())
}
```

```java
// ... user clicks on 'next page' button ...

Page nextPage = client.charts.listPageAfter(firstPage.nextPageStartsAfter);
for(Chart chart: charts.items) {
System.out.println("Chart " + chart.key())
}
```

```java
// ... user clicks on 'previous page' button ...

Page previousPage = client.charts.listPageBefore(nextPage.previousPageEndsBefore);
for(Chart chart: charts.items) {
System.out.println("Chart " + chart.key())
}
```

### Creating a workspace

```java
import seatsio.SeatsioClient;
import seatsio.Region;

SeatsioClient client = new SeatsioClient(Region.EU, ); // company admin key can be found on https://app.seats.io/company-settings
client.workspaces.create("a workspace");
```

### Creating a chart and an event with the company admin key

```java
import seatsio.SeatsioClient;
import seatsio.Region;
import seatsio.charts.Chart;
import seatsio.events.Event;

// company admin key can be found on https://app.seats.io/company-settings
// workspace public key can be found on https://app.seats.io/workspace-settings
SeatsioClient client = new SeatsioClient(Region.EU, , );
Chart chart = client.charts.create();
Event event = client.events.create(chart.key());
System.out.println("Created event with key " + event.key());
```

### Listing categories

```java
import seatsio.SeatsioClient;
import seatsio.Category;

SeatsioClient client = new SeatsioClient(Region.EU, "");

List categories = client.charts.listCategories("the chart key");
categories.forEach(category -> {
System.out.println("Category " + category.label());
});
```

### Updating a category
```java
import seatsio.charts.CategoryKey;
import seatsio.charts.CategoryUpdateParams;
import seatsio.SeatsioClient;

SeatsioClient client = new SeatsioClient(Region.EU, "");

client.charts.updateCategory("the chart key", CategoryKey.of("the category key"),
new CategoryUpdateParams("New label", "#cccccc", false));
```

## Error handling

When an API call results in a 4xx or 5xx error (e.g. when a chart could not be found), a SeatsioException is thrown.

This exception contains a message string describing what went wrong, and also two other properties:

- `errors`: a list of errors that the server returned. In most cases, this array will contain only one element, an instance of ApiError, containing an error code and a message.
- `requestId`: the identifier of the request you made. Please mention this to us when you have questions, as it will make debugging easier.

## Rate limiting - exponential backoff

This library supports [exponential backoff](https://en.wikipedia.org/wiki/Exponential_backoff).

When you send too many concurrent requests, the server returns an error `429 - Too Many Requests`. The client reacts to this by waiting for a while, and then retrying the request.
If the request still fails with an error `429`, it waits a little longer, and try again. By default this happens 5 times, before giving up (after approximately 15 seconds).

We throw a `RateLimitExceededException` (which is a subclass of `SeatsioException`) when exponential backoff eventually fails.

To change the maximum number of retries, create the `SeatsioClient` as follows:

```java
SeatsioClient client = new SeatsioClient(Region.EU, ).maxRetries(3);
```

Passing in 0 disables exponential backoff completely. In that case, the client will never retry a failed request.

## Multi-threading

It's perfectly fine to re-use an instance of `SeatsioClient` in different threads. All methods are thread-safe.

## Connection pooling

We manage a connection pool under the hood, to avoid having to reconnect to the seats.io server on every call. This pool supports 200 concurrent connections.

The connection pool is shared between all instances of `SeatsioClient`.