[Android Client] Break down multi-threaded classes by thread

remoting/client/jni/jni_pairing_secret_fetcher.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <remoting/client/jni/jni_pairing_secret_fetcher.h>
+#include "base/bind.h"
+#include "base/location.h"
+#include "remoting/client/jni/chromoting_jni_runtime.h"
+#include "remoting/client/jni/jni_client.h"
+
+namespace remoting {
+
+JniPairingSecretFetcher::JniPairingSecretFetcher(ChromotingJniRuntime* runtime,
+                                   base::WeakPtr<JniClient> client,
+                                   const std::string& host_id) :
+    jni_runtime_(runtime),
+    jni_client_(client),
+    host_id_(host_id),
+    weak_factory_(this) {}
+
+JniPairingSecretFetcher::~JniPairingSecretFetcher() {
+  DCHECK(jni_runtime_->ui_task_runner()->BelongsToCurrentThread());
+}
+
+void JniPairingSecretFetcher::FetchSecret(
+    bool pairable,
+    const protocol::SecretFetchedCallback& callback) {
+  DCHECK (jni_runtime_->ui_task_runner()->BelongsToCurrentThread());
+
+  if (!jni_client_) {
+    return;
+  }
+
+  // Delete pairing credentials if they exist.
+  jni_client_->CommitPairingCredentials(host_id_, "", "");
+
+  callback_ = callback;
+  jni_client_->DisplayAuthenticationPrompt(pairable);
+}
+
+void JniPairingSecretFetcher::ProvideSecret(const std::string& pin) {
+  DCHECK(jni_runtime_->ui_task_runner()->BelongsToCurrentThread());
+  DCHECK(!callback_.is_null());
+
+  jni_runtime_->network_task_runner()->PostTask(FROM_HERE,
+                                                base::Bind(callback_, pin));
+}
+
+base::WeakPtr<JniPairingSecretFetcher> JniPairingSecretFetcher::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
+}  // namespace remoting