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Scope is a APM for tests to give engineering teams unprecedented visibility into their CI process to quickly identify, troubleshoot and fix failed builds. This artifact contains dependencies for Scope.

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package com.undefinedlabs.scope.deps.okio;

final class SegmentPool {
    /** The maximum number of bytes to pool. */
    // TODO: Is 64 KiB a good maximum size? Do we ever have that many idle segments?
    static final long MAX_SIZE = 64 * 1024; // 64 KiB.

    /** Singly-linked list of segments. */
    static Segment next;

    /** Total bytes in this pool. */
    static long byteCount;

    private SegmentPool() {
    }

    static Segment take() {
        synchronized (SegmentPool.class) {
            if (next != null) {
                Segment result = next;
                next = result.next;
                result.next = null;
                byteCount -= Segment.SIZE;
                return result;
            }
        }
        return new Segment(); // Pool is empty. Don't zero-fill while holding a lock.
    }

    static void recycle(Segment segment) {
        if (segment.next != null || segment.prev != null) throw new IllegalArgumentException();
        if (segment.shared) return; // This segment cannot be recycled.
        synchronized (SegmentPool.class) {
            if (byteCount + Segment.SIZE > MAX_SIZE) return; // Pool is full.
            byteCount += Segment.SIZE;
            segment.next = next;
            segment.pos = segment.limit = 0;
            next = segment;
        }
    }
}