src/jdk.jfr/share/classes/jdk/jfr/consumer/RecordedStackTrace.java
author egahlin
Mon, 08 Jul 2019 23:08:05 +0200
branchJEP-349-branch
changeset 57460 bcbc53560c77
parent 50113 caf115bb98ad
child 58112 e7754025004b
permissions -rw-r--r--
Reduce allocation rate by minimizing number of fields in RecordedEvent
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/*
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 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.jfr.consumer;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import jdk.jfr.internal.Type;
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/**
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 * A recorded stack trace.
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 *
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 * @since 9
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 */
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public final class RecordedStackTrace extends RecordedObject {
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    static ObjectFactory<RecordedStackTrace> createFactory(Type type, TimeConverter timeConverter) {
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        return new ObjectFactory<RecordedStackTrace>(type, timeConverter) {
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            @Override
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            RecordedStackTrace createTyped(ObjectContext objectContext, long id, Object[] values) {
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                return new RecordedStackTrace(objectContext, values);
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            }
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        };
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    }
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    private RecordedStackTrace(ObjectContext objectContext, Object[] values) {
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        super(objectContext, values);
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    }
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    /**
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     * Returns the frames in the stack trace.
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     *
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     * @return a list of Java stack frames, not {@code null}
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     */
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    @SuppressWarnings("unchecked")
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    public List<RecordedFrame> getFrames() {
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        Object[] array = getTyped("frames", Object[].class, null);
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        if (array == null) {
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            return Collections.EMPTY_LIST;
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        }
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        List<?> list = Arrays.asList(array);
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        return (List<RecordedFrame>) list;
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    }
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    /**
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     * Returns {@code true} if the stack trace is truncated due to its size,
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     * {@code false} otherwise.
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     *
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     * @return {@code true} if the stack trace is truncated, {@code false}
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     *         otherwise
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     */
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    public boolean isTruncated() {
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        return getTyped("truncated", Boolean.class, true);
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    }
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}