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products/Sources/formale Sprachen/Java/Tomcat/java/org/apache/tomcat/util/log/ (Apache Software Stiftung Version 2.4.65^©) Datei vom 10.10.2023 mit Größe 6 kB

Quelle SystemLogHandler.java Sprache: JAVA

/*
*  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.util.log;

import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
* This helper class may be used to do sophisticated redirection of
* System.out and System.err on a per Thread basis.
*
* A stack is implemented per Thread so that nested startCapture
* and stopCapture can be used.
*
* @author Remy Maucherat
* @author Glenn L. Nielsen
*/
public class SystemLogHandler extends PrintStream {

    // ----------------------------------------------------------- Constructors

    /**
     * Construct the handler to capture the output of the given steam.
     *
     * @param wrapped The stream to capture
     */
    public SystemLogHandler(PrintStream wrapped) {
        super(wrapped);
        out = wrapped;
    }

    // ----------------------------------------------------- Instance Variables

    /**
     * Wrapped PrintStream.
     */
    private final PrintStream out;

    /**
     * Thread <-> CaptureLog associations.
     */
    private static final ThreadLocal<Deque<CaptureLog>> logs = new ThreadLocal<>();

    /**
     * Spare CaptureLog ready for reuse.
     */
    private static final Queue<CaptureLog> reuse = new ConcurrentLinkedQueue<>();

    // --------------------------------------------------------- Public Methods

    /**
     * Start capturing thread's output.
     */
    public static void startCapture() {
        CaptureLog log = null;
        if (!reuse.isEmpty()) {
            try {
                log = reuse.remove();
            } catch (NoSuchElementException e) {
                log = new CaptureLog();
            }
        } else {
            log = new CaptureLog();
        }
        Deque<CaptureLog> stack = logs.get();
        if (stack == null) {
            stack = new ArrayDeque<>();
            logs.set(stack);
        }
        stack.addFirst(log);
    }

    /**
     * Stop capturing thread's output.
     *
     * @return The captured data
     */
    public static String stopCapture() {
        Queue<CaptureLog> stack = logs.get();
        if (stack == null || stack.isEmpty()) {
            return null;
        }
        CaptureLog log = stack.remove();
        if (log == null) {
            return null;
        }
        String capture = log.getCapture();
        log.reset();
        reuse.add(log);
        return capture;
    }

    // ------------------------------------------------------ Protected Methods

    /**
     * Find PrintStream to which the output must be written to.
     * @return the print stream
     */
    protected PrintStream findStream() {
        Queue<CaptureLog> stack = logs.get();
        if (stack != null && !stack.isEmpty()) {
            CaptureLog log = stack.peek();
            if (log != null) {
                PrintStream ps = log.getStream();
                if (ps != null) {
                    return ps;
                }
            }
        }
        return out;
    }

    // ---------------------------------------------------- PrintStream Methods

    @Override
    public void flush() {
        findStream().flush();
    }

    @Override
    public void close() {
        findStream().close();
    }

    @Override
    public boolean checkError() {
        return findStream().checkError();
    }

    @Override
    protected void setError() {
        //findStream().setError();
    }

    @Override
    public void write(int b) {
        findStream().write(b);
    }

    @Override
    public void write(byte[] b)
        throws IOException {
        findStream().write(b);
    }

    @Override
    public void write(byte[] buf, int off, int len) {
        findStream().write(buf, off, len);
    }

    @Override
    public void print(boolean b) {
        findStream().print(b);
    }

    @Override
    public void print(char c) {
        findStream().print(c);
    }

    @Override
    public void print(int i) {
        findStream().print(i);
    }

    @Override
    public void print(long l) {
        findStream().print(l);
    }

    @Override
    public void print(float f) {
        findStream().print(f);
    }

    @Override
    public void print(double d) {
        findStream().print(d);
    }

    @Override
    public void print(char[] s) {
        findStream().print(s);
    }

    @Override
    public void print(String s) {
        findStream().print(s);
    }

    @Override
    public void print(Object obj) {
        findStream().print(obj);
    }

    @Override
    public void println() {
        findStream().println();
    }

    @Override
    public void println(boolean x) {
        findStream().println(x);
    }

    @Override
    public void println(char x) {
        findStream().println(x);
    }

    @Override
    public void println(int x) {
        findStream().println(x);
    }

    @Override
    public void println(long x) {
        findStream().println(x);
    }

    @Override
    public void println(float x) {
        findStream().println(x);
    }

    @Override
    public void println(double x) {
        findStream().println(x);
    }

    @Override
    public void println(char[] x) {
        findStream().println(x);
    }

    @Override
    public void println(String x) {
        findStream().println(x);
    }

    @Override
    public void println(Object x) {
        findStream().println(x);
    }

}

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