SignalPID binding addition (#1392)

virtdata-lib-basics/src/main/java/io/nosqlbench/virtdata/library/basics/shared/unary_int/SignalPID.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2023 nosqlbench
+ *
+ * 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 io.nosqlbench.virtdata.library.basics.shared.unary_int;
+
+import io.nosqlbench.virtdata.api.annotations.Categories;
+import io.nosqlbench.virtdata.api.annotations.Category;
+import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
+
+import java.util.function.LongFunction;
+
+/**
+ * This function provides the current NB process identifier.
+ * Primarily used when NB is used as a signal agent.
+ */
+@ThreadSafeMapper
+@Categories({Category.general})
+public class SignalPID implements LongFunction<Long> {
+
+    private final Long pid;
+
+    public SignalPID() {
+        this.pid = ProcessHandle.current().pid();
+    }
+
+    @Override
+    public Long apply(long i1) {
+        return this.pid;
+    }
+}

virtdata-lib-basics/src/test/java/io/nosqlbench/virtdata/library/basics/tests/long_long/SignalPIDTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2023 nosqlbench
+ *
+ * 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 io.nosqlbench.virtdata.library.basics.tests.long_long;
+
+import io.nosqlbench.virtdata.library.basics.shared.unary_int.SignalPID;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class SignalPIDTest {
+    private final static Logger logger = LogManager.getLogger(SignalPIDTest.class);
+
+    @Test
+    public void testSignalPIDIdentity() {
+        final Long currentProcessId = ProcessHandle.current().pid();
+        assertThat(new SignalPID().apply(1L)).isEqualTo(currentProcessId);
+        assertThat(new SignalPID().apply(2L)).isEqualTo(currentProcessId);
+    }
+
+}