io.druid.segment.loading.StorageLocation.java Source code

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Here is the source code for io.druid.segment.loading.StorageLocation.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.segment.loading;

import com.google.common.collect.Sets;
import io.druid.timeline.DataSegment;

import java.io.File;
import java.util.Set;

/**
*/
class StorageLocation {
    private final File path;
    private final long maxSize;
    private final Set<DataSegment> segments;

    private volatile long currSize = 0;

    StorageLocation(File path, long maxSize) {
        this.path = path;
        this.maxSize = maxSize;

        this.segments = Sets.newHashSet();
    }

    File getPath() {
        return path;
    }

    long getMaxSize() {
        return maxSize;
    }

    synchronized void addSegment(DataSegment segment) {
        if (segments.add(segment)) {
            currSize += segment.getSize();
        }
    }

    synchronized void removeSegment(DataSegment segment) {
        if (segments.remove(segment)) {
            currSize -= segment.getSize();
        }
    }

    boolean canHandle(long size) {
        return available() >= size;
    }

    synchronized long available() {
        return maxSize - currSize;
    }

    StorageLocation mostEmpty(StorageLocation other) {
        return available() > other.available() ? this : other;
    }
}