87 lines
2.8 KiB
Java
87 lines
2.8 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.dbcp.pool2.impl;
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import java.io.PrintWriter;
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import java.text.DateFormat;
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import java.text.SimpleDateFormat;
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/**
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* CallStack strategy that uses the stack trace from a {@link Throwable}. This strategy, while slower than the
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* SecurityManager implementation, provides call stack method names and other metadata in addition to the call stack
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* of classes.
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*
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* @see Throwable#fillInStackTrace()
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* @since 2.4.3
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*/
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public class ThrowableCallStack implements CallStack {
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private final String messageFormat;
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//@GuardedBy("dateFormat")
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private final DateFormat dateFormat;
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private volatile Snapshot snapshot;
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/**
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* Create a new instance.
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*
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* @param messageFormat message format
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* @param useTimestamp whether to format the dates in the output message or not
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*/
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public ThrowableCallStack(final String messageFormat, final boolean useTimestamp) {
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this.messageFormat = messageFormat;
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this.dateFormat = useTimestamp ? new SimpleDateFormat(messageFormat) : null;
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}
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@Override
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public synchronized boolean printStackTrace(final PrintWriter writer) {
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final Snapshot snapshotRef = this.snapshot;
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if (snapshotRef == null) {
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return false;
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}
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final String message;
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if (dateFormat == null) {
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message = messageFormat;
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} else {
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synchronized (dateFormat) {
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message = dateFormat.format(Long.valueOf(snapshotRef.timestamp));
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}
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}
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writer.println(message);
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snapshotRef.printStackTrace(writer);
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return true;
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}
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@Override
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public void fillInStackTrace() {
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snapshot = new Snapshot();
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}
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@Override
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public void clear() {
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snapshot = null;
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}
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/**
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* A snapshot of a throwable.
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*/
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private static class Snapshot extends Throwable {
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private static final long serialVersionUID = 1L;
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private final long timestamp = System.currentTimeMillis();
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}
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}
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