org.springframework.integration.file.tail.ApacheCommonsFileTailingMessageProducer.java Source code

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Here is the source code for org.springframework.integration.file.tail.ApacheCommonsFileTailingMessageProducer.java

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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.integration.file.tail;

import org.apache.commons.io.input.Tailer;
import org.apache.commons.io.input.TailerListener;

/**
 * File tailer that delegates to the Apache Commons Tailer.
 *
 * @author Gary Russell
 * @since 3.0
 *
 */
public class ApacheCommonsFileTailingMessageProducer extends FileTailingMessageProducerSupport
        implements TailerListener {

    private volatile Tailer tailer;

    private volatile long pollingDelay = 1000;

    private volatile boolean end = true;

    private volatile boolean reopen = false;

    /**
     * The delay between checks of the file for new content in milliseconds.
     * @param pollingDelay The delay.
     */
    public void setPollingDelay(long pollingDelay) {
        this.pollingDelay = pollingDelay;
    }

    /**
     * If true, tail from the end of the file, otherwise
     * include all lines from the beginning. Default true.
     * @param end true or false
     */
    public void setEnd(boolean end) {
        this.end = end;
    }

    /**
     * If true, close and reopen the file between reading chunks;
     * default false.
     * @param reopen true or false.
     */
    public void setReopen(boolean reopen) {
        this.reopen = reopen;
    }

    @Override
    public String getComponentType() {
        return super.getComponentType() + " (Apache)";
    }

    @Override
    protected void doStart() {
        super.doStart();
        Tailer theTailer = new Tailer(this.getFile(), this, this.pollingDelay, this.end, this.reopen);
        this.getTaskExecutor().execute(theTailer);
        this.tailer = theTailer;
    }

    @Override
    protected void doStop() {
        super.doStop();
        this.tailer.stop();
    }

    @Override
    public void init(Tailer tailer) {
    }

    @Override
    public void fileNotFound() {
        this.publish("File not found: " + this.getFile().getAbsolutePath());
        try {
            Thread.sleep(this.getMissingFileDelay());
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
    }

    @Override
    public void fileRotated() {
        this.publish("File rotated: " + this.getFile().getAbsolutePath());
    }

    @Override
    public void handle(String line) {
        send(line);
    }

    @Override
    public void handle(Exception ex) {
        this.publish(ex.getMessage());
    }

}