Move general purpose destructor callbacks to vespalib.

3 files changed, 45 insertions, 0 deletions

diff --git a/vespalib/src/vespa/vespalib/util/CMakeLists.txt b/vespalib/src/vespa/vespalib/util/CMakeLists.txt
index 5a82fb200e0..22fbe0a95f6 100644
--- a/vespalib/src/vespa/vespalib/util/CMakeLists.txt
+++ b/vespalib/src/vespa/vespalib/util/CMakeLists.txt
@@ -17,6 +17,7 @@ vespa_add_library(vespalib_vespalib_util OBJECT
     closuretask.cpp
     compress.cpp
     compressor.cpp
+    destructor_callbacks.cpp
     dual_merge_director.cpp
     error.cpp
     exception.cpp
diff --git a/vespalib/src/vespa/vespalib/util/destructor_callbacks.cpp b/vespalib/src/vespa/vespalib/util/destructor_callbacks.cpp
new file mode 100644
index 00000000000..edb8381e64d
--- /dev/null
+++ b/vespalib/src/vespa/vespalib/util/destructor_callbacks.cpp
@@ -0,0 +1,12 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#include "destructor_callbacks.h"
+#include "gate.h"
+
+namespace vespalib {
+
+GateCallback::~GateCallback() {
+    _gate.countDown();
+}
+
+}
diff --git a/vespalib/src/vespa/vespalib/util/destructor_callbacks.h b/vespalib/src/vespa/vespalib/util/destructor_callbacks.h
new file mode 100644
index 00000000000..fc0d23fa177
--- /dev/null
+++ b/vespalib/src/vespa/vespalib/util/destructor_callbacks.h
@@ -0,0 +1,32 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#pragma once
+
+#include "idestructorcallback.h"
+
+namespace vespalib {
+
+class Gate;
+
+class GateCallback : public vespalib::IDestructorCallback {
+public:
+    GateCallback(vespalib::Gate & gate) noexcept : _gate(gate) {}
+    ~GateCallback() override;
+private:
+    vespalib::Gate & _gate;
+};
+
+class IgnoreCallback : public vespalib::IDestructorCallback {
+public:
+    IgnoreCallback() noexcept { }
+    ~IgnoreCallback() override = default;
+};
+
+template <typename T>
+struct KeepAlive : public vespalib::IDestructorCallback {
+    explicit KeepAlive(T toKeep) noexcept : _toKeep(std::move(toKeep)) { }
+    ~KeepAlive() override = default;
+    T _toKeep;
+};
+
+}