Support Gradle configuration cache

The configuration cache is a feature that significantly improves build performance by caching the result of the configuration phase and reusing this for subsequent builds.

Implementing support for the configuration cache in this plugin would improve users experience.

See https://docs.gradle.org/nightly/userguide/configuration_cache.html

The configuration cache will be introduced in Gradle 6.6. But this can already be tested using 6.6-milestone-2.

Running the last Gradle Nightly + Kotlin 14-M2 + AGP 4.1.0-beta02 everything is working fine until we enable this plugin.

* What went wrong:
Configuration cache state could not be cached: field 'inputFileProperty' from type 'com.getkeepsafe.dexcount.DexCountTask': error writing value of type 'org.gradle.api.internal.file.DefaultFilePropertyFactory$DefaultRegularFileVar'
> Configuration cache state could not be cached: field 'provider' from type 'org.gradle.api.internal.provider.MappingProvider': error writing value of type 'org.gradle.api.internal.provider.TransformBackedProvider'
   > Configuration cache state could not be cached: field 'transformer' from type 'org.gradle.api.internal.provider.TransformBackedProvider': error writing value of type 'com.getkeepsafe.dexcount.ThreeThreeApplicator$applyToApkVariant$1$1$fileProvider$1'
      > Configuration cache state could not be cached: field 'this$0' from type 'com.getkeepsafe.dexcount.ThreeThreeApplicator$applyToApkVariant$1$1$fileProvider$1': error writing value of type 'com.getkeepsafe.dexcount.ThreeThreeApplicator$applyToApkVariant$1$1'
         > Configuration cache state could not be cached: field '$output' from type 'com.getkeepsafe.dexcount.ThreeThreeApplicator$applyToApkVariant$1$1': error writing value of type 'com.android.build.gradle.internal.api.ApkVariantOutputImpl'
            > Configuration cache state could not be cached: field 'services' from type 'com.android.build.gradle.internal.api.ApkVariantOutputImpl': error writing value of type 'com.android.build.gradle.internal.services.BaseServicesImpl'
               > Configuration cache state could not be cached: field 'projectServices' from type 'com.android.build.gradle.internal.services.BaseServicesImpl': error writing value of type 'com.android.build.gradle.internal.services.ProjectServices'
                  > Configuration cache state could not be cached: field 'buildServiceRegistry' from type 'com.android.build.gradle.internal.services.ProjectServices': error writing value of type 'org.gradle.api.services.internal.DefaultBuildServicesRegistry'
                     > Configuration cache state could not be cached: field 'isolatableFactory' from type 'org.gradle.api.services.internal.DefaultBuildServicesRegistry': error writing value of type 'org.gradle.internal.snapshot.impl.DefaultValueSnapshotter'
                        > Configuration cache state could not be cached: field 'isolatableValueVisitor' from type 'org.gradle.internal.snapshot.impl.DefaultValueSnapshotter': error writing value of type 'org.gradle.internal.snapshot.impl.DefaultValueSnapshotter$IsolatableVisitor'
                           > Configuration cache state could not be cached: field 'classLoaderHasher' from type 'org.gradle.internal.snapshot.impl.DefaultValueSnapshotter$IsolatableVisitor': error writing value of type 'org.gradle.groovy.scripts.internal.RegistryAwareClassLoaderHierarchyHasher'
                              > Configuration cache state could not be cached: field 'classLoaderFactory' from type 'org.gradle.groovy.scripts.internal.RegistryAwareClassLoaderHierarchyHasher': error writing value of type 'org.gradle.internal.classloader.DefaultHashingClassLoaderFactory'
                                 > Configuration cache state could not be cached: field 'classpathHasher' from type 'org.gradle.internal.classloader.DefaultHashingClassLoaderFactory': error writing value of type 'org.gradle.api.internal.initialization.loadercache.DefaultClasspathHasher'
                                    > Configuration cache state could not be cached: field 'fingerprinter' from type 'org.gradle.api.internal.initialization.loadercache.DefaultClasspathHasher': error writing value of type 'org.gradle.internal.fingerprint.classpath.impl.DefaultClasspathFingerprinter'
                                       > Configuration cache state could not be cached: field 'fileCollectionSnapshotter' from type 'org.gradle.internal.fingerprint.classpath.impl.DefaultClasspathFingerprinter': error writing value of type 'org.gradle.internal.fingerprint.impl.DefaultFileCollectionSnapshotter'
                                          > Configuration cache state could not be cached: field 'genericFileTreeSnapshotter' from type 'org.gradle.internal.fingerprint.impl.DefaultFileCollectionSnapshotter': error writing value of type 'org.gradle.internal.fingerprint.impl.DefaultGenericFileTreeSnapshotter'
                                             > Configuration cache state could not be cached: field 'hasher' from type 'org.gradle.internal.fingerprint.impl.DefaultGenericFileTreeSnapshotter': error writing value of type 'org.gradle.api.internal.changedetection.state.CachingFileHasher'
                                                > Configuration cache state could not be cached: field 'cache' from type 'org.gradle.api.internal.changedetection.state.CachingFileHasher': error writing value of type 'org.gradle.cache.internal.CrossProcessSynchronizingCache'
                                                   > Configuration cache state could not be cached: field 'cacheAccess' from type 'org.gradle.cache.internal.CrossProcessSynchronizingCache': error writing value of type 'org.gradle.cache.internal.LockOnDemandCrossProcessCacheAccess'
                                                      > Configuration cache state could not be cached: field 'fileLock' from type 'org.gradle.cache.internal.LockOnDemandCrossProcessCacheAccess': error writing value of type 'org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock'
                                                         > Configuration cache state could not be cached: field 'this$0' from type 'org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock': error writing value of type 'org.gradle.cache.internal.DefaultFileLockManager'
                                                            > Configuration cache state could not be cached: field 'fileLockContentionHandler' from type 'org.gradle.cache.internal.DefaultFileLockManager': error writing value of type 'org.gradle.cache.internal.locklistener.DefaultFileLockContentionHandler'
                                                               > Configuration cache state could not be cached: field 'addressFactory' from type 'org.gradle.cache.internal.locklistener.DefaultFileLockContentionHandler': error writing value of type 'org.gradle.internal.remote.internal.inet.InetAddressFactory'
                                                                  > Configuration cache state could not be cached: field 'communicationAddresses' from type 'org.gradle.internal.remote.internal.inet.InetAddressFactory': error writing value of type 'java.util.ArrayList'
                                                                     > 'ObjectOutputStream.putFields' is not supported by the Gradle configuration cache.

[benjamin-bader]

That’s a great idea and I’m kind of shocked that in five years it never occurred to me 😅 Thanks, I’ll consider that.

[CristianGM]

So, they loose the stdout only when is running on the same machine because up-to-date checks, but don’t if they change because it’s not FROM-CACHE.

I always though that this kind of tasks that need to do some heavy work + print should be split in 2 tasks. The first, and cacheable, do the heavy work and output the report. The second and not cacheable do read the report and print, so it’s fast and doesn’t even need to have up-to-date checks.

In any case, that’s a different discussion. 👍