first commit

1 files changed, 34 insertions, 0 deletions

diff --git a/node_modules/exponential-backoff/src/delay/delay.base.ts b/node_modules/exponential-backoff/src/delay/delay.base.ts
new file mode 100644
index 0000000..bed90d6
--- /dev/null
+++ b/node_modules/exponential-backoff/src/delay/delay.base.ts
@@ -0,0 +1,34 @@
+import { IDelay } from "./delay.interface";
+import { IBackOffOptions } from "../options";
+import { JitterFactory } from "../jitter/jitter.factory";
+
+export abstract class Delay implements IDelay {
+  protected attempt = 0;
+  constructor(private options: IBackOffOptions) {}
+
+  public apply() {
+    return new Promise(resolve => setTimeout(resolve, this.jitteredDelay));
+  }
+
+  public setAttemptNumber(attempt: number) {
+    this.attempt = attempt;
+  }
+
+  private get jitteredDelay() {
+    const jitter = JitterFactory(this.options);
+    return jitter(this.delay);
+  }
+
+  private get delay() {
+    const constant = this.options.startingDelay;
+    const base = this.options.timeMultiple;
+    const power = this.numOfDelayedAttempts;
+    const delay = constant * Math.pow(base, power);
+
+    return Math.min(delay, this.options.maxDelay);
+  }
+
+  protected get numOfDelayedAttempts() {
+    return this.attempt;
+  }
+}