Add Closables helper to plugin toolkit

lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/util/Closables.java

@@ -0,0 +1,41 @@
+/*
+ * 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.trino.plugin.base.util;
+
+import static java.util.Objects.requireNonNull;
+
+public final class Closables
+{
+    private Closables() {}
+
+    public static <T extends Throwable> T closeAllSuppress(T rootCause, AutoCloseable... closeables)
+    {
+        requireNonNull(rootCause, "rootCause is null");
+        requireNonNull(closeables, "closeables is null");
+        for (AutoCloseable closeable : closeables) {
+            try {
+                if (closeable != null) {
+                    closeable.close();
+                }
+            }
+            catch (Throwable e) {
+                // Self-suppression not permitted
+                if (rootCause != e) {
+                    rootCause.addSuppressed(e);
+                }
+            }
+        }
+        return rootCause;
+    }
+}

lib/trino-plugin-toolkit/src/test/java/io/trino/plugin/base/util/TestClosables.java

@@ -0,0 +1,110 @@
+/*
+ * 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.trino.plugin.base.util;
+
+import org.testng.annotations.Test;
+
+import java.util.Optional;
+
+import static io.trino.plugin.base.util.Closables.closeAllSuppress;
+import static java.util.Objects.requireNonNull;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.testng.Assert.assertTrue;
+
+public class TestClosables
+{
+    @Test
+    public void testCloseAllSuppressNonThrowing()
+    {
+        RuntimeException rootException = new RuntimeException("root");
+        TestClosable closable = new TestClosable(Optional.empty());
+        closeAllSuppress(rootException, closable);
+        assertTrue(closable.isClosed());
+        assertThat(rootException.getSuppressed()).isEmpty();
+    }
+
+    @Test
+    public void testCloseAllSuppressThrowingOther()
+    {
+        RuntimeException rootException = new RuntimeException("root");
+        RuntimeException closeException = new RuntimeException("close");
+        TestClosable closable = new TestClosable(Optional.of(closeException));
+        closeAllSuppress(rootException, closable);
+        assertTrue(closable.isClosed());
+        assertThat(rootException.getSuppressed()).containsExactly(closeException);
+    }
+
+    @Test
+    public void testCloseAllSuppressThrowingRoot()
+    {
+        RuntimeException rootException = new RuntimeException("root");
+        TestClosable closable = new TestClosable(Optional.of(rootException));
+        closeAllSuppress(rootException, closable);
+        assertTrue(closable.isClosed());
+        assertThat(rootException.getSuppressed()).isEmpty();
+    }
+
+    @Test
+    public void testCloseAllSuppressNullClosable()
+    {
+        RuntimeException rootException = new RuntimeException("root");
+        closeAllSuppress(rootException, (AutoCloseable) null);
+        assertThat(rootException.getSuppressed()).isEmpty();
+    }
+
+    @Test
+    public void testCloseAllSuppressMultipleClosables()
+    {
+        RuntimeException rootException = new RuntimeException("root");
+        RuntimeException closeException1 = new RuntimeException("close");
+        RuntimeException closeException2 = new RuntimeException("close2");
+        TestClosable closable1 = new TestClosable(Optional.of(closeException1));
+        TestClosable closable2 = new TestClosable(Optional.of(closeException2));
+        TestClosable closable3 = new TestClosable(Optional.empty()); // non throwing
+        TestClosable closable4 = new TestClosable(Optional.of(rootException)); // throwing root
+        closeAllSuppress(rootException, closable1, closable2, closable3, closable4, null);
+        assertTrue(closable1.isClosed());
+        assertTrue(closable2.isClosed());
+        assertTrue(closable3.isClosed());
+        assertTrue(closable4.isClosed());
+        assertThat(rootException.getSuppressed()).containsExactly(closeException1, closeException2);
+    }
+
+    private static class TestClosable
+            implements AutoCloseable
+    {
+        private final Optional<Exception> closeException;
+        private boolean closed;
+
+        public TestClosable(Optional<Exception> closeException)
+        {
+            this.closeException = requireNonNull(closeException, "closeException is null");
+        }
+
+        @Override
+        public void close()
+                throws Exception
+        {
+            closed = true;
+            if (closeException.isPresent()) {
+                throw closeException.get();
+            }
+        }
+
+        public boolean isClosed()
+        {
+            return closed;
+        }
+    }
+}