ONOS checkin based on commit tag e796610b1f721d02f9b0e213cf6f7790c10ecd60

Change-Id: Ife8810491034fe7becdba75dda20de4267bd15cd

1 files changed, 93 insertions, 0 deletions

diff --git a/framework/src/onos/core/api/src/main/java/org/onosproject/net/intent/constraint/LatencyConstraint.java b/framework/src/onos/core/api/src/main/java/org/onosproject/net/intent/constraint/LatencyConstraint.java
new file mode 100644
index 00000000..54eb4ea5
--- /dev/null
+++ b/framework/src/onos/core/api/src/main/java/org/onosproject/net/intent/constraint/LatencyConstraint.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * Licensed 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.
+ */
+package org.onosproject.net.intent.constraint;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.MoreObjects;
+import org.onosproject.net.Link;
+import org.onosproject.net.Path;
+import org.onosproject.net.intent.Constraint;
+import org.onosproject.net.resource.link.LinkResourceService;
+
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+import java.util.Objects;
+
+import static org.onosproject.net.AnnotationKeys.LATENCY;
+import static org.onosproject.net.AnnotationKeys.getAnnotatedValue;
+
+/**
+ * Constraint that evaluates the latency through a path.
+ */
+@Beta
+public class LatencyConstraint implements Constraint {
+
+    private final Duration latency;
+
+    /**
+     * Creates a new constraint to keep under specified latency through a path.
+     * @param latency latency to be kept
+     */
+    public LatencyConstraint(Duration latency) {
+        this.latency = latency;
+    }
+
+    // Constructor for serialization
+    private LatencyConstraint() {
+        this.latency = Duration.ZERO;
+    }
+
+    public Duration latency() {
+        return latency;
+    }
+
+    @Override
+    public double cost(Link link, LinkResourceService resourceService) {
+        return getAnnotatedValue(link, LATENCY);
+    }
+
+    @Override
+    public boolean validate(Path path, LinkResourceService resourceService) {
+        double pathLatency = path.links().stream().mapToDouble(link -> cost(link, resourceService)).sum();
+        return Duration.of((long) pathLatency, ChronoUnit.MICROS).compareTo(latency) <= 0;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(latency);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (!(obj instanceof LatencyConstraint)) {
+            return false;
+        }
+
+        final LatencyConstraint that = (LatencyConstraint) obj;
+        return Objects.equals(this.latency, that.latency);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("latency", latency)
+                .toString();
+    }
+}