Add ContextService

docs/development/core/public/kibana-plugin-public.contextcontainer.createhandler.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [ContextContainer](./kibana-plugin-public.contextcontainer.md) &gt; [createHandler](./kibana-plugin-public.contextcontainer.createhandler.md)
+
+## ContextContainer.createHandler() method
+
+Create a new handler function pre-wired to context for the plugin.
+
+<b>Signature:</b>
+
+```typescript
+createHandler(handler: Handler<TContext, THandlerReturn, THandlerParameters>): (...rest: THandlerParameters) => Promise<THandlerReturn>;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  handler | <code>Handler&lt;TContext, THandlerReturn, THandlerParameters&gt;</code> |  |
+
+<b>Returns:</b>
+
+`(...rest: THandlerParameters) => Promise<THandlerReturn>`
+
+## Remarks
+
+This must be called when the handler is registered by the consuming plugin. If this is called later in the lifecycle it will throw an exception.
+

docs/development/core/public/kibana-plugin-public.contextcontainer.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [ContextContainer](./kibana-plugin-public.contextcontainer.md)
+
+## ContextContainer interface
+
+An object that handles registration of context providers and building of new context objects.
+
+<b>Signature:</b>
+
+```typescript
+export interface ContextContainer<TContext extends {}, THandlerReturn, THandlerParameters extends any[] = []> 
+```
+
+## Methods
+
+|  Method | Description |
+|  --- | --- |
+|  [createHandler(handler)](./kibana-plugin-public.contextcontainer.createhandler.md) | Create a new handler function pre-wired to context for the plugin. |
+|  [registerContext(contextName, provider)](./kibana-plugin-public.contextcontainer.registercontext.md) | Register a new context provider. Throws an exception if more than one provider is registered for the same context key. |
+
+## Remarks
+
+A `ContextContainer` can be used by any Core service or plugin (known as the "service owner") which wishes to expose APIs in a handler function. The container object will manage registering context providers and building a context object for a handler with all of the contexts that should be exposed to the handler's plugin. This is dependent on the dependencies that the handler's plugin declares.
+
+Contexts providers are executed in the order they were registered. Each provider gets access to context values provided by any plugins that it depends on.
+

docs/development/core/public/kibana-plugin-public.contextcontainer.registercontext.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [ContextContainer](./kibana-plugin-public.contextcontainer.md) &gt; [registerContext](./kibana-plugin-public.contextcontainer.registercontext.md)
+
+## ContextContainer.registerContext() method
+
+Register a new context provider. Throws an exception if more than one provider is registered for the same context key.
+
+<b>Signature:</b>
+
+```typescript
+registerContext<TContextName extends keyof TContext>(contextName: TContextName, provider: ContextProvider<TContext, TContextName, THandlerParameters>): this;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  contextName | <code>TContextName</code> | The key of the <code>TContext</code> object this provider supplies the value for. |
+|  provider | <code>ContextProvider&lt;TContext, TContextName, THandlerParameters&gt;</code> | A [ContextProvider](./kibana-plugin-public.contextprovider.md) to be called each time a new context is created. |
+
+<b>Returns:</b>
+
+`this`
+
+The `ContextContainer` for method chaining.
+

docs/development/core/public/kibana-plugin-public.contextprovider.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [ContextProvider](./kibana-plugin-public.contextprovider.md)
+
+## ContextProvider type
+
+A function that returns a context value for a specific key of given context type.
+
+<b>Signature:</b>
+
+```typescript
+export declare type ContextProvider<TContext extends {}, TContextName extends keyof TContext, TProviderParameters extends any[] = []> = (context: Partial<TContext>, ...rest: TProviderParameters) => Promise<TContext[TContextName]> | TContext[TContextName];
+```
+
+## Remarks
+
+This function will be called each time a new context is built for a handler invocation.
+

docs/development/core/public/kibana-plugin-public.contextsetup.createcontextcontainer.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [ContextSetup](./kibana-plugin-public.contextsetup.md) &gt; [createContextContainer](./kibana-plugin-public.contextsetup.createcontextcontainer.md)
+
+## ContextSetup.createContextContainer() method
+
+Creates a new [ContextContainer](./kibana-plugin-public.contextcontainer.md) for a service owner.
+
+<b>Signature:</b>
+
+```typescript
+createContextContainer<TContext extends {}, TProviderParameters extends any[] = []>(): ContextContainer<TContext, TProviderParameters>;
+```
+<b>Returns:</b>
+
+`ContextContainer<TContext, TProviderParameters>`
+

docs/development/core/public/kibana-plugin-public.contextsetup.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [ContextSetup](./kibana-plugin-public.contextsetup.md)
+
+## ContextSetup interface
+
+An object that handles registration of context providers and building of new context objects.
+
+<b>Signature:</b>
+
+```typescript
+export interface ContextSetup 
+```
+
+## Methods
+
+|  Method | Description |
+|  --- | --- |
+|  [createContextContainer()](./kibana-plugin-public.contextsetup.createcontextcontainer.md) | Creates a new [ContextContainer](./kibana-plugin-public.contextcontainer.md) for a service owner. |
+
+## Remarks
+
+A `ContextContainer` can be used by any Core service or plugin (known as the "service owner") which wishes to expose APIs in a handler function. The container object will manage registering context providers and building a context object for a handler with all of the contexts that should be exposed to the handler's plugin. This is dependent on the dependencies that the handler's plugin declares.
+
+Contexts providers are executed in the order they were registered. Each provider gets access to context values provided by any plugins that it depends on.
+
+## Example
+
+How to create your own context
+
+```ts
+class MyPlugin {
+  setup(core) {
+    this.myHandlers = new Map<string, Handler>();
+    this.contextContainer = core.createContextContainer();
+    return {
+      registerContext: this.contextContainer.register,
+      registerHandler: (endpoint, handler) =>
+        // `createHandler` must be called immediately.
+        this.myHandlers.set(endpoint, this.contextContainer.createHandler(handler)),
+    };
+  }
+
+  start() {
+    return {
+      registerContext: this.contextContainer.register,
+    };
+  }
+}
+
+```
+

docs/development/core/public/kibana-plugin-public.coresetup.context.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [CoreSetup](./kibana-plugin-public.coresetup.md) &gt; [context](./kibana-plugin-public.coresetup.context.md)
+
+## CoreSetup.context property
+
+[ContextSetup](./kibana-plugin-public.contextsetup.md)
+
+<b>Signature:</b>
+
+```typescript
+context: Pick<ContextSetup, 'createContextContainer'>;
+```

docs/development/core/public/kibana-plugin-public.coresetup.md

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 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [context](./kibana-plugin-public.coresetup.context.md) | <code>Pick&lt;ContextSetup, 'createContextContainer'&gt;</code> | [ContextSetup](./kibana-plugin-public.contextsetup.md) |
 |  [fatalErrors](./kibana-plugin-public.coresetup.fatalerrors.md) | <code>FatalErrorsSetup</code> | [FatalErrorsSetup](./kibana-plugin-public.fatalerrorssetup.md) |
 |  [http](./kibana-plugin-public.coresetup.http.md) | <code>HttpSetup</code> | [HttpSetup](./kibana-plugin-public.httpsetup.md) |
 |  [notifications](./kibana-plugin-public.coresetup.notifications.md) | <code>NotificationsSetup</code> | [NotificationsSetup](./kibana-plugin-public.notificationssetup.md) |

docs/development/core/public/kibana-plugin-public.md

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 |  [ChromeRecentlyAccessed](./kibana-plugin-public.chromerecentlyaccessed.md) | [APIs](./kibana-plugin-public.chromerecentlyaccessed.md) for recently accessed history. |
 |  [ChromeRecentlyAccessedHistoryItem](./kibana-plugin-public.chromerecentlyaccessedhistoryitem.md) |  |
 |  [ChromeStart](./kibana-plugin-public.chromestart.md) | ChromeStart allows plugins to customize the global chrome header UI and enrich the UX with additional information about the current location of the browser. |
+|  [ContextContainer](./kibana-plugin-public.contextcontainer.md) | An object that handles registration of context providers and building of new context objects. |
+|  [ContextSetup](./kibana-plugin-public.contextsetup.md) | An object that handles registration of context providers and building of new context objects. |
 |  [CoreSetup](./kibana-plugin-public.coresetup.md) | Core services exposed to the <code>Plugin</code> setup lifecycle |
 |  [CoreStart](./kibana-plugin-public.corestart.md) | Core services exposed to the <code>Plugin</code> start lifecycle |
 |  [DocLinksStart](./kibana-plugin-public.doclinksstart.md) |  |
@@ -58,6 +60,7 @@ The plugin integrates with the core system via lifecycle events: `setup`<!-- -->
 |  --- | --- |
 |  [ChromeHelpExtension](./kibana-plugin-public.chromehelpextension.md) |  |
 |  [ChromeNavLinkUpdateableFields](./kibana-plugin-public.chromenavlinkupdateablefields.md) |  |
+|  [ContextProvider](./kibana-plugin-public.contextprovider.md) | A function that returns a context value for a specific key of given context type. |
 |  [HttpSetup](./kibana-plugin-public.httpsetup.md) |  |
 |  [HttpStart](./kibana-plugin-public.httpstart.md) |  |
 |  [PluginInitializer](./kibana-plugin-public.plugininitializer.md) | The <code>plugin</code> export at the root of a plugin's <code>public</code> directory should conform to this interface. |

src/core/public/context/context.mock.ts

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+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ContextContainerImplementation } from './context';
+
+export type ContextContainerMock = jest.Mocked<
+  PublicMethodsOf<ContextContainerImplementation<any, any, any>>
+>;
+
+const createContextMock = () => {
+  const contextMock: ContextContainerMock = {
+    registerContext: jest.fn(),
+    createHandler: jest.fn(),
+    setCurrentPlugin: jest.fn(),
+  };
+  return contextMock;
+};
+
+export const contextMock = {
+  create: createContextMock,
+};