flens.input.GrepInput.java Source code

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Here is the source code for flens.input.GrepInput.java

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/**
 *
 *     Copyright 2013 KU Leuven Research and Development - iMinds - Distrinet
 *
 *     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
 *
 *         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.
 *
 *     Administrative Contact: dnet-project-office@cs.kuleuven.be
 *     Technical Contact: wouter.deborger@cs.kuleuven.be
 */
package flens.input;

import java.io.File;
import java.util.regex.Pattern;

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

import flens.core.Record;
import flens.core.Tagger;
import flens.input.util.AbstractActiveInput;

public class GrepInput extends AbstractActiveInput implements TailerListener {

    private Tailer tailer;
    private Pattern regex;
    private boolean tailFromEnd;
    private long delay = 1000;
    private String file;

    public GrepInput(String name, Tagger tagger, String file, String regex, boolean tail) {
        super(name, tagger);
        this.file = file;
        tailer = new Tailer(new File(file), this, delay, tail);
        this.regex = Pattern.compile(regex);
        this.tailFromEnd = tail;
    }

    @Override
    public void run() {
        tailer.run();
    }

    @Override
    public void stop() {
        tailer.stop();
        super.stop();
    }

    @Override
    public void init(Tailer tailer) {
    }

    @Override
    public void fileNotFound() {
        err("file not found: " + tailer.getFile().getName(), null);
    }

    @Override
    public void fileRotated() {

    }

    @Override
    public void handle(String line) {
        if (regex.matcher(line).matches())
            dispatch(Record.forLog(file, line));

    }

    @Override
    public void handle(Exception ex) {
        err("tailer failed: " + tailer.getFile().getName(), ex);

    }
}