PEL: Run a user defined function on every PEL

Add a for_each() function to the PEL repository that takes a user
defined function that will be run on every PEL, unless that function
says to stop early.

The user defined function is a std::function<bool>(const PEL&);

For example, to save up to 100 IDs in the repo into a vector:
      std::vector<uint32_t> ids;
      ForEachFunc f = [&ids](const PEL& pel) {
          ids.push_back(pel.id());
          return ids.size() == 100 ? true : false;
      };

      repo.for_each(f);

This will be used to find which PELs still need to be sent up to the
host after a reboot, among other things.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ic60525a8ab3dd593ba37e43a6cb0b3db8dda7cee

1 files changed, 36 insertions, 0 deletions

diff --git a/test/openpower-pels/repository_test.cpp b/test/openpower-pels/repository_test.cpp
index 118cb12..0c927f6 100644
--- a/test/openpower-pels/repository_test.cpp
+++ b/test/openpower-pels/repository_test.cpp
@@ -176,3 +176,39 @@ TEST_F(RepositoryTest, TestGetPELData)
     ASSERT_TRUE(pelData);
     EXPECT_EQ(dataCopy, *pelData);
 }
+
+TEST_F(RepositoryTest, TestForEach)
+{
+    Repository repo{repoPath};
+
+    // Add 2 PELs
+    auto data = pelDataFactory(TestPELType::pelSimple);
+    auto pel = std::make_unique<PEL>(data);
+    repo.add(pel);
+
+    pel = std::make_unique<PEL>(data);
+    pel->assignID();
+    pel->setCommitTime();
+    repo.add(pel);
+
+    // Make a function that saves the IDs
+    std::vector<uint32_t> ids;
+    Repository::ForEachFunc f1 = [&ids](const PEL& pel) {
+        ids.push_back(pel.id());
+        return false;
+    };
+
+    repo.for_each(f1);
+
+    EXPECT_EQ(ids.size(), 2);
+
+    // Stop after the first time in.
+    Repository::ForEachFunc f2 = [&ids](const PEL& pel) {
+        ids.push_back(pel.id());
+        return true;
+    };
+
+    ids.clear();
+    repo.for_each(f2);
+    EXPECT_EQ(ids.size(), 1);
+}