io.druid.indexing.common.tasklogs.FileTaskLogs.java Source code

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Here is the source code for io.druid.indexing.common.tasklogs.FileTaskLogs.java

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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.
 */

package io.druid.indexing.common.tasklogs;

import com.google.common.base.Optional;
import com.google.common.io.ByteSource;
import com.google.common.io.Files;
import com.google.inject.Inject;
import com.metamx.common.logger.Logger;
import io.druid.indexing.common.config.FileTaskLogsConfig;
import io.druid.tasklogs.TaskLogs;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

public class FileTaskLogs implements TaskLogs {
    private static final Logger log = new Logger(FileTaskLogs.class);

    private final FileTaskLogsConfig config;

    @Inject
    public FileTaskLogs(FileTaskLogsConfig config) {
        this.config = config;
    }

    @Override
    public void pushTaskLog(final String taskid, File file) throws IOException {
        if (config.getDirectory().exists() || config.getDirectory().mkdirs()) {
            final File outputFile = fileForTask(taskid);
            Files.copy(file, outputFile);
            log.info("Wrote task log to: %s", outputFile);
        } else {
            throw new IOException(String.format("Unable to create task log dir[%s]", config.getDirectory()));
        }
    }

    @Override
    public Optional<ByteSource> streamTaskLog(final String taskid, final long offset) throws IOException {
        final File file = fileForTask(taskid);
        if (file.exists()) {
            return Optional.<ByteSource>of(new ByteSource() {
                @Override
                public InputStream openStream() throws IOException {
                    return LogUtils.streamFile(file, offset);
                }
            });
        } else {
            return Optional.absent();
        }
    }

    private File fileForTask(final String taskid) {
        return new File(config.getDirectory(), String.format("%s.log", taskid));
    }
}