1 files changed, 71 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/client/Bounds.cpp b/qpid/cpp/src/qpid/client/Bounds.cpp
new file mode 100644
index 0000000000..cc2577d5fc
--- /dev/null
+++ b/qpid/cpp/src/qpid/client/Bounds.cpp
@@ -0,0 +1,71 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "qpid/client/Bounds.h"
+
+#include "qpid/log/Statement.h"
+#include "qpid/sys/Waitable.h"
+
+namespace qpid {
+namespace client {
+
+using sys::Waitable;
+
+Bounds::Bounds(size_t maxSize) : max(maxSize), current(0) {}
+
+bool Bounds::expand(size_t sizeRequired, bool block) {
+    if (!max) return true;
+    Waitable::ScopedLock l(lock);
+    if (block) {
+        Waitable::ScopedWait w(lock);
+        while (current + sizeRequired > max) 
+            lock.wait();
+    }
+    current += sizeRequired;
+    return current <= max;
+}
+
+void Bounds::reduce(size_t size) {
+    if (!max || size == 0) return;
+    Waitable::ScopedLock l(lock);
+    assert(current >= size);
+    current -= std::min(size, current);
+    if (current < max && lock.hasWaiters()) {
+        lock.notifyAll();
+    }
+}
+
+size_t Bounds::getCurrentSize() {
+    Waitable::ScopedLock l(lock);
+    return current;
+}
+
+std::ostream& operator<<(std::ostream& out, const Bounds& bounds) {
+    out << "current=" << bounds.current << ", max=" << bounds.max << " [" << &bounds << "]";
+    return out;
+}
+
+void Bounds::setException(const sys::ExceptionHolder& e) {
+    Waitable::ScopedLock l(lock);    
+    lock.setException(e);
+    lock.waitWaiters();         // Wait for waiting threads to exit.
+}
+
+}} // namespace qpid::client