X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fcommon%2FOpQueue.h;fp=src%2Fceph%2Fsrc%2Fcommon%2FOpQueue.h;h=3902b329c69d81f9c2d969e1c1ce7759d0226777;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/common/OpQueue.h b/src/ceph/src/common/OpQueue.h
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+++ b/src/ceph/src/common/OpQueue.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef OP_QUEUE_H
+#define OP_QUEUE_H
+
+#include "include/msgr.h"
+
+#include <list>
+#include <functional>
+
+namespace ceph {
+  class Formatter;
+}
+
+/**
+ * Abstract class for all Op Queues
+ *
+ * In order to provide optimized code, be sure to declare all
+ * virutal functions as final in the derived class.
+ */
+
+template <typename T, typename K>
+class OpQueue {
+
+  public:
+    // How many Ops are in the queue
+    virtual unsigned length() const = 0;
+    // Ops of this class should be deleted immediately. If out isn't
+    // nullptr then items should be added to the front in
+    // front-to-back order. The typical strategy is to visit items in
+    // the queue in *reverse* order and to use *push_front* to insert
+    // them into out.
+    virtual void remove_by_class(K k, std::list<T> *out) = 0;
+    // Enqueue op in the back of the strict queue
+    virtual void enqueue_strict(K cl, unsigned priority, T item) = 0;
+    // Enqueue op in the front of the strict queue
+    virtual void enqueue_strict_front(K cl, unsigned priority, T item) = 0;
+    // Enqueue op in the back of the regular queue
+    virtual void enqueue(K cl, unsigned priority, unsigned cost, T item) = 0;
+    // Enqueue the op in the front of the regular queue
+    virtual void enqueue_front(K cl, unsigned priority, unsigned cost, T item) = 0;
+    // Returns if the queue is empty
+    virtual bool empty() const = 0;
+    // Return an op to be dispatch
+    virtual T dequeue() = 0;
+    // Formatted output of the queue
+    virtual void dump(ceph::Formatter *f) const = 0;
+    // Don't leak resources on destruction
+    virtual ~OpQueue() {}; 
+};
+
+#endif