Readability improvement: Move CacheDistributor constructor params to readonly abstract fields of concrete cache implementations. Remove empty CacheDistributor constructor.

src/cache-distributions/cache-distributor.ts

@@ -10,10 +10,8 @@ export enum State {
 
 abstract class CacheDistributor {
   protected CACHE_KEY_PREFIX = 'setup-python';
-  constructor(
-    protected packageManager: string,
-    protected cacheDependencyPath: string
-  ) {}
+  protected abstract readonly packageManager: string;
+  protected abstract readonly cacheDependencyPath: string;
 
   protected abstract getCacheGlobalDirectories(): Promise<string[]>;
   protected abstract computeKeys(): Promise<{

src/cache-distributions/pip-cache.ts

@@ -12,12 +12,13 @@ import {CACHE_DEPENDENCY_BACKUP_PATH} from './constants';
 
 class PipCache extends CacheDistributor {
   private cacheDependencyBackupPath: string = CACHE_DEPENDENCY_BACKUP_PATH;
+  protected readonly packageManager = 'pip';
 
   constructor(
     private pythonVersion: string,
-    cacheDependencyPath = '**/requirements.txt'
+    protected readonly cacheDependencyPath = '**/requirements.txt'
   ) {
-    super('pip', cacheDependencyPath);
+    super();
   }
 
   protected async getCacheGlobalDirectories() {

src/cache-distributions/pipenv-cache.ts

@@ -6,11 +6,13 @@ import * as core from '@actions/core';
 import CacheDistributor from './cache-distributor';
 
 class PipenvCache extends CacheDistributor {
+  protected readonly packageManager = 'pipenv';
+
   constructor(
     private pythonVersion: string,
-    protected cacheDependencyPath: string = '**/Pipfile.lock'
+    protected readonly cacheDependencyPath: string = '**/Pipfile.lock'
   ) {
-    super('pipenv', cacheDependencyPath);
+    super();
   }
 
   protected async getCacheGlobalDirectories() {

src/cache-distributions/poetry-cache.ts

@@ -8,12 +8,15 @@ import CacheDistributor from './cache-distributor';
 import {logWarning} from '../utils';
 
 class PoetryCache extends CacheDistributor {
+  protected readonly packageManager = 'poetry';
+
+
   constructor(
     private pythonVersion: string,
-    protected cacheDependencyPath: string = '**/poetry.lock',
+    protected readonly cacheDependencyPath: string = '**/poetry.lock',
     protected poetryProjects: Set<string> = new Set<string>()
   ) {
-    super('poetry', cacheDependencyPath);
+    super();
   }
 
   protected async getCacheGlobalDirectories() {