/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.tomcat.dbcp.pool2.impl;
/** * Strategy for obtaining and printing the current call stack. This is primarily useful for * {@linkplain UsageTracking usage tracking} so that different JVMs and configurations can use more efficient strategies * for obtaining the current call stack depending on metadata needs. * * @see CallStackUtils * @since 2.4.3
*/ publicinterface CallStack {
/** * Clears the current stack trace snapshot. Subsequent calls to {@link #printStackTrace(PrintWriter)} will be * no-ops until another call to {@link #fillInStackTrace()}.
*/ void clear();
/** * Takes a snapshot of the current call stack. Subsequent calls to {@link #printStackTrace(PrintWriter)} will print * out that stack trace until it is {@linkplain #clear() cleared}.
*/ void fillInStackTrace();
/** * Prints the current stack trace if available to a PrintWriter. The format is undefined and is primarily useful * for debugging issues with {@link PooledObject} usage in user code. * * @param writer a PrintWriter to write the current stack trace to if available * @return true if a stack trace was available to print or false if nothing was printed
*/ boolean printStackTrace(PrintWriter writer);
}
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