1 files changed, 122 insertions, 0 deletions
diff --git a/cmds/statsd/src/matchers/CombinationLogMatchingTracker.cpp b/cmds/statsd/src/matchers/CombinationLogMatchingTracker.cpp
new file mode 100644
index 000000000000..51a38b61ccf2
--- /dev/null
+++ b/cmds/statsd/src/matchers/CombinationLogMatchingTracker.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include "Log.h"
+
+#include "CombinationLogMatchingTracker.h"
+#include "matchers/matcher_util.h"
+
+namespace android {
+namespace os {
+namespace statsd {
+
+using std::set;
+using std::string;
+using std::unique_ptr;
+using std::unordered_map;
+using std::vector;
+
+CombinationLogMatchingTracker::CombinationLogMatchingTracker(const string& name, const int index)
+    : LogMatchingTracker(name, index) {
+}
+
+CombinationLogMatchingTracker::~CombinationLogMatchingTracker() {
+}
+
+bool CombinationLogMatchingTracker::init(const vector<AtomMatcher>& allLogMatchers,
+                                         const vector<sp<LogMatchingTracker>>& allTrackers,
+                                         const unordered_map<string, int>& matcherMap,
+                                         vector<bool>& stack) {
+    if (mInitialized) {
+        return true;
+    }
+
+    // mark this node as visited in the recursion stack.
+    stack[mIndex] = true;
+
+    AtomMatcher_Combination matcher = allLogMatchers[mIndex].combination();
+
+    // LogicalOperation is missing in the config
+    if (!matcher.has_operation()) {
+        return false;
+    }
+
+    mLogicalOperation = matcher.operation();
+
+    if (mLogicalOperation == LogicalOperation::NOT && matcher.matcher_size() != 1) {
+        return false;
+    }
+
+    for (const string& child : matcher.matcher()) {
+        auto pair = matcherMap.find(child);
+        if (pair == matcherMap.end()) {
+            ALOGW("Matcher %s not found in the config", child.c_str());
+            return false;
+        }
+
+        int childIndex = pair->second;
+
+        // if the child is a visited node in the recursion -> circle detected.
+        if (stack[childIndex]) {
+            ALOGE("Circle detected in matcher config");
+            return false;
+        }
+
+        if (!allTrackers[childIndex]->init(allLogMatchers, allTrackers, matcherMap, stack)) {
+            ALOGW("child matcher init failed %s", child.c_str());
+            return false;
+        }
+
+        mChildren.push_back(childIndex);
+
+        const set<int>& childTagIds = allTrackers[childIndex]->getTagIds();
+        mTagIds.insert(childTagIds.begin(), childTagIds.end());
+    }
+
+    mInitialized = true;
+    // unmark this node in the recursion stack.
+    stack[mIndex] = false;
+    return true;
+}
+
+void CombinationLogMatchingTracker::onLogEvent(const LogEvent& event,
+                                               const vector<sp<LogMatchingTracker>>& allTrackers,
+                                               vector<MatchingState>& matcherResults) {
+    // this event has been processed.
+    if (matcherResults[mIndex] != MatchingState::kNotComputed) {
+        return;
+    }
+
+    if (mTagIds.find(event.GetTagId()) == mTagIds.end()) {
+        matcherResults[mIndex] = MatchingState::kNotMatched;
+        return;
+    }
+
+    // evaluate children matchers if they haven't been evaluated.
+    for (const int childIndex : mChildren) {
+        if (matcherResults[childIndex] == MatchingState::kNotComputed) {
+            const sp<LogMatchingTracker>& child = allTrackers[childIndex];
+            child->onLogEvent(event, allTrackers, matcherResults);
+        }
+    }
+
+    bool matched = combinationMatch(mChildren, mLogicalOperation, matcherResults);
+    matcherResults[mIndex] = matched ? MatchingState::kMatched : MatchingState::kNotMatched;
+}
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android