1 files changed, 73 insertions, 0 deletions
diff --git a/framework/src/onos/core/net/src/main/java/org/onosproject/net/intent/impl/phase/IntentProcessPhase.java b/framework/src/onos/core/net/src/main/java/org/onosproject/net/intent/impl/phase/IntentProcessPhase.java
new file mode 100644
index 00000000..bce572c6
--- /dev/null
+++ b/framework/src/onos/core/net/src/main/java/org/onosproject/net/intent/impl/phase/IntentProcessPhase.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2015 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.impl.phase;
+
+import org.onosproject.net.intent.IntentData;
+import org.onosproject.net.intent.impl.IntentProcessor;
+
+import java.util.Objects;
+import java.util.Optional;
+
+/**
+ * Represents a phase of processing an intent.
+ */
+public interface IntentProcessPhase {
+
+    /**
+     * Execute the procedure represented by the instance
+     * and generates the next update instance.
+     *
+     * @return next update
+     */
+    Optional<IntentProcessPhase> execute();
+
+    /**
+     * Create a starting intent process phase according to intent data this class holds.
+     *
+     * @param processor intent processor to be passed to intent process phases
+     *                  generated while this instance is working
+     * @param data intent data to be processed
+     * @param current intent date that is stored in the store
+     * @return starting intent process phase
+     */
+    static IntentProcessPhase newInitialPhase(IntentProcessor processor,
+                                              IntentData data, IntentData current) {
+        switch (data.request()) {
+            case INSTALL_REQ:
+                return new InstallRequest(processor, data, Optional.ofNullable(current));
+            case WITHDRAW_REQ:
+                return new WithdrawRequest(processor, data, Optional.ofNullable(current));
+            case PURGE_REQ:
+                return new PurgeRequest(data, Optional.ofNullable(current));
+            default:
+                // illegal state
+                return new Failed(data);
+        }
+    }
+
+    static void transferErrorCount(IntentData data, Optional<IntentData> stored) {
+        if (stored.isPresent()) {
+            IntentData storedData = stored.get();
+            if (Objects.equals(data.intent(), storedData.intent()) &&
+                    Objects.equals(data.request(), storedData.request())) {
+                data.setErrorCount(storedData.errorCount());
+            } else {
+                data.setErrorCount(0);
+            }
+        }
+    }
+
+}