Don't send a reply to clients until messages are safely in a non-volatile store.

service/src/main/java/org/whispersystems/textsecuregcm/util/BlockingThreadPoolExecutor.java

@@ -1,56 +0,0 @@
-/*
- * Copyright 2013-2020 Signal Messenger, LLC
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-package org.whispersystems.textsecuregcm.util;
-
-import com.codahale.metrics.MetricRegistry;
-import com.codahale.metrics.SharedMetricRegistries;
-import com.codahale.metrics.Timer;
-
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.concurrent.Semaphore;
-import java.util.concurrent.ThreadPoolExecutor;
-import java.util.concurrent.TimeUnit;
-
-import static com.codahale.metrics.MetricRegistry.name;
-
-public class BlockingThreadPoolExecutor extends ThreadPoolExecutor {
-
-  private final Semaphore semaphore;
-  private final Timer     acquirePermitTimer;
-
-  public BlockingThreadPoolExecutor(String name, int threads, int bound) {
-    super(threads, threads, 1, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
-    this.semaphore = new Semaphore(bound);
-
-    final MetricRegistry metricRegistry = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);
-
-    this.acquirePermitTimer = metricRegistry.timer(name(getClass(), name, "acquirePermit"));
-    metricRegistry.gauge(name(getClass(), name, "permitsAvailable"), () -> semaphore::availablePermits);
-  }
-
-  @Override
-  public void execute(Runnable task) {
-    try (final Timer.Context ignored = acquirePermitTimer.time()) {
-      semaphore.acquireUninterruptibly();
-    }
-
-    try {
-      super.execute(task);
-    } catch (Throwable t) {
-      semaphore.release();
-      throw new RuntimeException(t);
-    }
-  }
-
-  @Override
-  protected void afterExecute(Runnable r, Throwable t) {
-    semaphore.release();
-  }
-
-  public int getSize() {
-    return ((LinkedBlockingQueue)getQueue()).size();
-  }
-}