WIP

 - apollo-cache-control@0.5.0-alpha.0
 - apollo-datasource-rest@0.3.0-alpha.0
 - apollo-datasource@0.3.0-alpha.0
 - apollo-engine-reporting@0.3.0-alpha.0
 - apollo-server-azure-functions@2.4.0-alpha.0
 - apollo-server-cache-memcached@0.3.0-alpha.0
 - apollo-server-cache-redis@0.3.0-alpha.0
 - apollo-server-caching@0.3.0-alpha.0
 - apollo-server-cloud-functions@2.4.0-alpha.0
 - apollo-server-cloudflare@2.4.0-alpha.0
 - apollo-server-core@2.4.0-alpha.0
 - apollo-server-express@2.4.0-alpha.0
 - apollo-server-hapi@2.4.0-alpha.0
 - apollo-server-integration-testsuite@2.4.0-alpha.0
 - apollo-server-koa@2.4.0-alpha.0
 - apollo-server-lambda@2.4.0-alpha.0
 - apollo-server-micro@2.4.0-alpha.0
 - apollo-server-plugin-base@0.3.0-alpha.0
 - apollo-server-testing@2.4.0-alpha.0
 - apollo-server@2.4.0-alpha.0
 - apollo-tracing@0.5.0-alpha.0
 - graphql-extensions@0.5.0-alpha.0

Ref: https://github.com/apollographql/apollo-server/pull/2111/files#r247616489

… use.

Without this change, the `document` property was not set on the
`requestContext` for consumption by request pipeline plugins.

To further guard against this oversight, I've removed the extra `document`
variable which was being used as scoped state for the document and switched to
directly using (and assigning to) the `requestContext.document`.

Nice catch, @glasser!

Ref: https://github.com/apollographql/apollo-server/pull/2111/files#r247617469

The parsed/validated cache store is on by default.  While it could be disabled,
in theory, it cannot be disabled since its an internal property of the
request pipeline processor class.

See confusion here:

  withspectrum/spectrum#4533 (comment)

Of my own making!

…ore`.

While the implementation of the `documentStore` is currently simple enough
to never throw (it is in-memory), it makes some sense to guard against future
extended functionality where an exception might be raised.

Since storing this object in a distributed memory store isn't currently
feasible, I'm not sure what such an exception would be right now, but I
don't mind being proactive!

Ref: https://github.com/apollographql/apollo-server/pull/2111/files#r247618501

Previously, this used the `JSON.stringify` length, but this is slightly more
aware.

…class.

The implementation of object-size approximation which is used for cache
eviction purposes in the `InMemoryLRUCache` implementation (via `lru-cache`)
was a short-term location for extensible logic which is better located
within `ApolloServerBase`.

This is particularly important since future logic may necessitate knowing or
understanding the current size (roughly, memory usage) of the in-memory
storage.  Effective immediately, this adds support for providing a `dispose`
function which is called when an object is purged from the cache to make
room for another.

In an effort to see how effective this cache is in production during this
alpha phase, we'll print out the stats on the document store every 60
seconds.

 - apollo-cache-control@0.5.0-alpha.1
 - apollo-datasource-rest@0.3.0-alpha.1
 - apollo-datasource@0.3.0-alpha.1
 - apollo-engine-reporting@0.3.0-alpha.1
 - apollo-server-azure-functions@2.4.0-alpha.1
 - apollo-server-cache-memcached@0.3.0-alpha.1
 - apollo-server-cache-redis@0.3.0-alpha.1
 - apollo-server-caching@0.3.0-alpha.1
 - apollo-server-cloud-functions@2.4.0-alpha.1
 - apollo-server-cloudflare@2.4.0-alpha.1
 - apollo-server-core@2.4.0-alpha.1
 - apollo-server-express@2.4.0-alpha.1
 - apollo-server-hapi@2.4.0-alpha.1
 - apollo-server-integration-testsuite@2.4.0-alpha.1
 - apollo-server-koa@2.4.0-alpha.1
 - apollo-server-lambda@2.4.0-alpha.1
 - apollo-server-micro@2.4.0-alpha.1
 - apollo-server-plugin-base@0.3.0-alpha.1
 - apollo-server-testing@2.4.0-alpha.1
 - apollo-server@2.4.0-alpha.1
 - apollo-tracing@0.5.0-alpha.1
 - graphql-extensions@0.5.0-alpha.1

… seconds."

This reverts commit 7a0d0e6, as I intended
when I originally introduced it.

Ref: #2111 (comment)

 - apollo-server-azure-functions@2.4.0-alpha.2
 - apollo-server-cloud-functions@2.4.0-alpha.2
 - apollo-server-cloudflare@2.4.0-alpha.2
 - apollo-server-core@2.4.0-alpha.2
 - apollo-server-express@2.4.0-alpha.2
 - apollo-server-hapi@2.4.0-alpha.2
 - apollo-server-integration-testsuite@2.4.0-alpha.2
 - apollo-server-koa@2.4.0-alpha.2
 - apollo-server-lambda@2.4.0-alpha.2
 - apollo-server-micro@2.4.0-alpha.2
 - apollo-server-plugin-base@0.3.0-alpha.2
 - apollo-server-testing@2.4.0-alpha.2
 - apollo-server@2.4.0-alpha.2
 - graphql-extensions@0.5.0-alpha.2