/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.utils;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.Writer;

/**
 * Buffered Writer that flushes its buffer when any write/append method is called after a certain
 * time has passed
 *
 */
public class PeriodicFlushingBufferedWriter extends BufferedWriter {
    private final long period;
    private long lastFlush = System.currentTimeMillis();

    public PeriodicFlushingBufferedWriter(long period, Writer out, int sz) {
        super(out, sz);
        this.period = period;
    }

    public PeriodicFlushingBufferedWriter(long period, Writer out) {
        super(out);
        this.period = period;
    }

    private void checkForFlush() throws IOException {
        final long now = System.currentTimeMillis();
        if (lastFlush <= (now + period)) {
            lastFlush = now;
            super.flush();
        }
    }

    @Override
    public void write(int c) throws IOException {
        super.write(c);
        checkForFlush();
    }

    @Override
    public void write(char[] cbuf, int off, int len) throws IOException {
        super.write(cbuf, off, len);
        checkForFlush();
    }

    @Override
    public void write(String s, int off, int len) throws IOException {
        super.write(s, off, len);
        checkForFlush();
    }

    @Override
    public void newLine() throws IOException {
        super.newLine();
        checkForFlush();
    }

    @Override
    public void write(char[] cbuf) throws IOException {
        super.write(cbuf);
        checkForFlush();
    }

    @Override
    public void write(String str) throws IOException {
        super.write(str);
        checkForFlush();
    }

    @Override
    public Writer append(CharSequence csq) throws IOException {
        final Writer w = super.append(csq);
        checkForFlush();
        return w;
    }

    @Override
    public Writer append(CharSequence csq, int start, int end) throws IOException {
        final Writer w = super.append(csq, start, end);
        checkForFlush();
        return w;
    }

    @Override
    public Writer append(char c) throws IOException {
        final Writer w = super.append(c);
        checkForFlush();
        return w;
    }
}