diff options
Diffstat (limited to 'kamon-core/src/main/java')
-rw-r--r-- | kamon-core/src/main/java/kamon/jsr166/LongAdder.java | 224 | ||||
-rw-r--r-- | kamon-core/src/main/java/kamon/jsr166/LongMaxUpdater.java | 191 | ||||
-rw-r--r-- | kamon-core/src/main/java/kamon/jsr166/Striped64.java | 371 | ||||
-rw-r--r-- | kamon-core/src/main/java/kamon/util/GlobPathFilter.java | 110 |
4 files changed, 0 insertions, 896 deletions
diff --git a/kamon-core/src/main/java/kamon/jsr166/LongAdder.java b/kamon-core/src/main/java/kamon/jsr166/LongAdder.java deleted file mode 100644 index 7e47ae63..00000000 --- a/kamon-core/src/main/java/kamon/jsr166/LongAdder.java +++ /dev/null @@ -1,224 +0,0 @@ -/* - -Note: this was copied from Doug Lea's CVS repository - http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/ - -LongAdder.java version 1.14 - -*/ - - -/* - * Written by Doug Lea with assistance from members of JCP JSR-166 - * Expert Group and released to the public domain, as explained at - * http://creativecommons.org/publicdomain/zero/1.0/ - */ - -package kamon.jsr166; - -import java.io.Serializable; - -/** - * One or more variables that together maintain an initially zero - * {@code long} sum. When updates (method {@link #add}) are contended - * across threads, the set of variables may grow dynamically to reduce - * contention. Method {@link #sum} (or, equivalently, {@link - * #longValue}) returns the current total combined across the - * variables maintaining the sum. - * - * <p>This class is usually preferable to {@link java.util.concurrent.atomic.AtomicLong} when - * multiple threads update a common sum that is used for purposes such - * as collecting statistics, not for fine-grained synchronization - * control. Under low update contention, the two classes have similar - * characteristics. But under high contention, expected throughput of - * this class is significantly higher, at the expense of higher space - * consumption. - * - * <p>This class extends {@link Number}, but does <em>not</em> define - * methods such as {@code equals}, {@code hashCode} and {@code - * compareTo} because instances are expected to be mutated, and so are - * not useful as collection keys. - * - * <p><em>jsr166e note: This class is targeted to be placed in - * java.util.concurrent.atomic.</em> - * - * @since 1.8 - * @author Doug Lea - */ -public class LongAdder extends Striped64 implements Serializable { - private static final long serialVersionUID = 7249069246863182397L; - - /** - * Version of plus for use in retryUpdate - */ - final long fn(long v, long x) { return v + x; } - - /** - * Creates a new adder with initial sum of zero. - */ - public LongAdder() { - } - - /** - * Adds the given value. - * - * @param x the value to add - */ - public void add(long x) { - Cell[] as; long b, v; HashCode hc; Cell a; int n; - if ((as = cells) != null || !casBase(b = base, b + x)) { - boolean uncontended = true; - int h = (hc = threadHashCode.get()).code; - if (as == null || (n = as.length) < 1 || - (a = as[(n - 1) & h]) == null || - !(uncontended = a.cas(v = a.value, v + x))) - retryUpdate(x, hc, uncontended); - } - } - - /** - * Equivalent to {@code add(1)}. - */ - public void increment() { - add(1L); - } - - /** - * Equivalent to {@code add(-1)}. - */ - public void decrement() { - add(-1L); - } - - /** - * Returns the current sum. The returned value is <em>NOT</em> an - * atomic snapshot; invocation in the absence of concurrent - * updates returns an accurate result, but concurrent updates that - * occur while the sum is being calculated might not be - * incorporated. - * - * @return the sum - */ - public long sum() { - long sum = base; - Cell[] as = cells; - if (as != null) { - int n = as.length; - for (int i = 0; i < n; ++i) { - Cell a = as[i]; - if (a != null) - sum += a.value; - } - } - return sum; - } - - /** - * Resets variables maintaining the sum to zero. This method may - * be a useful alternative to creating a new adder, but is only - * effective if there are no concurrent updates. Because this - * method is intrinsically racy, it should only be used when it is - * known that no threads are concurrently updating. - */ - public void reset() { - internalReset(0L); - } - - /** - * Equivalent in effect to {@link #sum} followed by {@link - * #reset}. This method may apply for example during quiescent - * points between multithreaded computations. If there are - * updates concurrent with this method, the returned value is - * <em>not</em> guaranteed to be the final value occurring before - * the reset. - * - * @return the sum - */ - public long sumThenReset() { - long sum = base; - Cell[] as = cells; - base = 0L; - if (as != null) { - int n = as.length; - for (int i = 0; i < n; ++i) { - Cell a = as[i]; - if (a != null) { - sum += a.value; - a.value = 0L; - } - } - } - return sum; - } - - public long sumAndReset() { - long sum = getAndSetBase(0L); - Cell[] as = cells; - if (as != null) { - int n = as.length; - for (int i = 0; i < n; ++i) { - Cell a = as[i]; - if (a != null) { - sum += a.getAndSet(0L); - } - } - } - return sum; - } - - /** - * Returns the String representation of the {@link #sum}. - * @return the String representation of the {@link #sum} - */ - public String toString() { - return Long.toString(sum()); - } - - /** - * Equivalent to {@link #sum}. - * - * @return the sum - */ - public long longValue() { - return sum(); - } - - /** - * Returns the {@link #sum} as an {@code int} after a narrowing - * primitive conversion. - */ - public int intValue() { - return (int)sum(); - } - - /** - * Returns the {@link #sum} as a {@code float} - * after a widening primitive conversion. - */ - public float floatValue() { - return (float)sum(); - } - - /** - * Returns the {@link #sum} as a {@code double} after a widening - * primitive conversion. - */ - public double doubleValue() { - return (double)sum(); - } - - private void writeObject(java.io.ObjectOutputStream s) - throws java.io.IOException { - s.defaultWriteObject(); - s.writeLong(sum()); - } - - private void readObject(java.io.ObjectInputStream s) - throws java.io.IOException, ClassNotFoundException { - s.defaultReadObject(); - busy = 0; - cells = null; - base = s.readLong(); - } - -} diff --git a/kamon-core/src/main/java/kamon/jsr166/LongMaxUpdater.java b/kamon-core/src/main/java/kamon/jsr166/LongMaxUpdater.java deleted file mode 100644 index fc9ea4e5..00000000 --- a/kamon-core/src/main/java/kamon/jsr166/LongMaxUpdater.java +++ /dev/null @@ -1,191 +0,0 @@ -/* - * Written by Doug Lea with assistance from members of JCP JSR-166 - * Expert Group and released to the public domain, as explained at - * http://creativecommons.org/publicdomain/zero/1.0/ - */ - -package kamon.jsr166; -import java.io.Serializable; - -/** - * One or more variables that together maintain a running {@code long} - * maximum with initial value {@code Long.MIN_VALUE}. When updates - * (method {@link #update}) are contended across threads, the set of - * variables may grow dynamically to reduce contention. Method {@link - * #max} (or, equivalently, {@link #longValue}) returns the current - * maximum across the variables maintaining updates. - * - * <p>This class extends {@link Number}, but does <em>not</em> define - * methods such as {@code equals}, {@code hashCode} and {@code - * compareTo} because instances are expected to be mutated, and so are - * not useful as collection keys. - * - * <p><em>jsr166e note: This class is targeted to be placed in - * java.util.concurrent.atomic.</em> - * - * @since 1.8 - * @author Doug Lea - */ -public class LongMaxUpdater extends Striped64 implements Serializable { - private static final long serialVersionUID = 7249069246863182397L; - - /** - * Version of max for use in retryUpdate - */ - final long fn(long v, long x) { return v > x ? v : x; } - - /** - * Creates a new instance with initial maximum of {@code - * Long.MIN_VALUE}. - */ - public LongMaxUpdater() { - base = Long.MIN_VALUE; - } - - /** - * Creates a new instance with the given initialValue - */ - public LongMaxUpdater(long initialValue) { - base = initialValue; - } - - - /** - * Updates the maximum to be at least the given value. - * - * @param x the value to update - */ - public void update(long x) { - Cell[] as; long b, v; HashCode hc; Cell a; int n; - if ((as = cells) != null || - (b = base) < x && !casBase(b, x)) { - boolean uncontended = true; - int h = (hc = threadHashCode.get()).code; - if (as == null || (n = as.length) < 1 || - (a = as[(n - 1) & h]) == null || - ((v = a.value) < x && !(uncontended = a.cas(v, x)))) - retryUpdate(x, hc, uncontended); - } - } - - /** - * Returns the current maximum. The returned value is - * <em>NOT</em> an atomic snapshot; invocation in the absence of - * concurrent updates returns an accurate result, but concurrent - * updates that occur while the value is being calculated might - * not be incorporated. - * - * @return the maximum - */ - public long max() { - Cell[] as = cells; - long max = base; - if (as != null) { - int n = as.length; - long v; - for (int i = 0; i < n; ++i) { - Cell a = as[i]; - if (a != null && (v = a.value) > max) - max = v; - } - } - return max; - } - - /** - * Resets variables maintaining updates to {@code Long.MIN_VALUE}. - * This method may be a useful alternative to creating a new - * updater, but is only effective if there are no concurrent - * updates. Because this method is intrinsically racy, it should - * only be used when it is known that no threads are concurrently - * updating. - */ - public void reset() { - internalReset(Long.MIN_VALUE); - } - - /** - * Equivalent in effect to {@link #max} followed by {@link - * #reset}. This method may apply for example during quiescent - * points between multithreaded computations. If there are - * updates concurrent with this method, the returned value is - * <em>not</em> guaranteed to be the final value occurring before - * the reset. - * - * @return the maximum - */ - public long maxThenReset(long newValue) { - Cell[] as = cells; - long max = base; - base = newValue; - if (as != null) { - int n = as.length; - for (int i = 0; i < n; ++i) { - Cell a = as[i]; - if (a != null) { - long v = a.value; - a.value = newValue; - if (v > max) - max = v; - } - } - } - return max; - } - - /** - * Returns the String representation of the {@link #max}. - * @return the String representation of the {@link #max} - */ - public String toString() { - return Long.toString(max()); - } - - /** - * Equivalent to {@link #max}. - * - * @return the maximum - */ - public long longValue() { - return max(); - } - - /** - * Returns the {@link #max} as an {@code int} after a narrowing - * primitive conversion. - */ - public int intValue() { - return (int)max(); - } - - /** - * Returns the {@link #max} as a {@code float} - * after a widening primitive conversion. - */ - public float floatValue() { - return (float)max(); - } - - /** - * Returns the {@link #max} as a {@code double} after a widening - * primitive conversion. - */ - public double doubleValue() { - return (double)max(); - } - - private void writeObject(java.io.ObjectOutputStream s) - throws java.io.IOException { - s.defaultWriteObject(); - s.writeLong(max()); - } - - private void readObject(java.io.ObjectInputStream s) - throws java.io.IOException, ClassNotFoundException { - s.defaultReadObject(); - busy = 0; - cells = null; - base = s.readLong(); - } - -} diff --git a/kamon-core/src/main/java/kamon/jsr166/Striped64.java b/kamon-core/src/main/java/kamon/jsr166/Striped64.java deleted file mode 100644 index 8fbfa4ba..00000000 --- a/kamon-core/src/main/java/kamon/jsr166/Striped64.java +++ /dev/null @@ -1,371 +0,0 @@ -/* - -Note: this was copied from Doug Lea's CVS repository - http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/ - -Striped64.java version 1.8 - -*/ - - -/* - * Written by Doug Lea with assistance from members of JCP JSR-166 - * Expert Group and released to the public domain, as explained at - * http://creativecommons.org/publicdomain/zero/1.0/ - */ - -package kamon.jsr166; - -import java.util.Random; - -/** - * A package-local class holding common representation and mechanics - * for classes supporting dynamic striping on 64bit values. The class - * extends Number so that concrete subclasses must publicly do so. - */ -abstract class Striped64 extends Number { - /* - * This class maintains a lazily-initialized table of atomically - * updated variables, plus an extra "base" field. The table size - * is a power of two. Indexing uses masked per-thread hash codes. - * Nearly all declarations in this class are package-private, - * accessed directly by subclasses. - * - * Table entries are of class Cell; a variant of AtomicLong padded - * to reduce cache contention on most processors. Padding is - * overkill for most Atomics because they are usually irregularly - * scattered in memory and thus don't interfere much with each - * other. But Atomic objects residing in arrays will tend to be - * placed adjacent to each other, and so will most often share - * cache lines (with a huge negative performance impact) without - * this precaution. - * - * In part because Cells are relatively large, we avoid creating - * them until they are needed. When there is no contention, all - * updates are made to the base field. Upon first contention (a - * failed CAS on base update), the table is initialized to size 2. - * The table size is doubled upon further contention until - * reaching the nearest power of two greater than or equal to the - * number of CPUS. Table slots remain empty (null) until they are - * needed. - * - * A single spinlock ("busy") is used for initializing and - * resizing the table, as well as populating slots with new Cells. - * There is no need for a blocking lock; when the lock is not - * available, threads try other slots (or the base). During these - * retries, there is increased contention and reduced locality, - * which is still better than alternatives. - * - * Per-thread hash codes are initialized to random values. - * Contention and/or table collisions are indicated by failed - * CASes when performing an update operation (see method - * retryUpdate). Upon a collision, if the table size is less than - * the capacity, it is doubled in size unless some other thread - * holds the lock. If a hashed slot is empty, and lock is - * available, a new Cell is created. Otherwise, if the slot - * exists, a CAS is tried. Retries proceed by "double hashing", - * using a secondary hash (Marsaglia XorShift) to try to find a - * free slot. - * - * The table size is capped because, when there are more threads - * than CPUs, supposing that each thread were bound to a CPU, - * there would exist a perfect hash function mapping threads to - * slots that eliminates collisions. When we reach capacity, we - * search for this mapping by randomly varying the hash codes of - * colliding threads. Because search is random, and collisions - * only become known via CAS failures, convergence can be slow, - * and because threads are typically not bound to CPUS forever, - * may not occur at all. However, despite these limitations, - * observed contention rates are typically low in these cases. - * - * It is possible for a Cell to become unused when threads that - * once hashed to it terminate, as well as in the case where - * doubling the table causes no thread to hash to it under - * expanded mask. We do not try to detect or remove such cells, - * under the assumption that for long-running instances, observed - * contention levels will recur, so the cells will eventually be - * needed again; and for short-lived ones, it does not matter. - */ - - /** - * Padded variant of AtomicLong supporting only raw accesses plus CAS. - * The value field is placed between pads, hoping that the JVM doesn't - * reorder them. - * - * JVM intrinsics note: It would be possible to use a release-only - * form of CAS here, if it were provided. - */ - static final class Cell { - volatile long p0, p1, p2, p3, p4, p5, p6; - volatile long value; - volatile long q0, q1, q2, q3, q4, q5, q6; - Cell(long x) { value = x; } - - final boolean cas(long cmp, long val) { - return UNSAFE.compareAndSwapLong(this, valueOffset, cmp, val); - } - - final long getAndSet(long val) { - long v; - do { - v = UNSAFE.getLongVolatile(this, valueOffset); - } while (!UNSAFE.compareAndSwapLong(this, valueOffset, v, val)); - return v; - } - - // Unsafe mechanics - private static final sun.misc.Unsafe UNSAFE; - private static final long valueOffset; - static { - try { - UNSAFE = getUnsafe(); - Class<?> ak = Cell.class; - valueOffset = UNSAFE.objectFieldOffset - (ak.getDeclaredField("value")); - } catch (Exception e) { - throw new Error(e); - } - } - - } - - /** - * Holder for the thread-local hash code. The code is initially - * random, but may be set to a different value upon collisions. - */ - static final class HashCode { - static final Random rng = new Random(); - int code; - HashCode() { - int h = rng.nextInt(); // Avoid zero to allow xorShift rehash - code = (h == 0) ? 1 : h; - } - } - - /** - * The corresponding ThreadLocal class - */ - static final class ThreadHashCode extends ThreadLocal<HashCode> { - public HashCode initialValue() { return new HashCode(); } - } - - /** - * Static per-thread hash codes. Shared across all instances to - * reduce ThreadLocal pollution and because adjustments due to - * collisions in one table are likely to be appropriate for - * others. - */ - static final ThreadHashCode threadHashCode = new ThreadHashCode(); - - /** Number of CPUS, to place bound on table size */ - static final int NCPU = Runtime.getRuntime().availableProcessors(); - - /** - * Table of cells. When non-null, size is a power of 2. - */ - transient volatile Cell[] cells; - - /** - * Base value, used mainly when there is no contention, but also as - * a fallback during table initialization races. Updated via CAS. - */ - transient volatile long base; - - /** - * Spinlock (locked via CAS) used when resizing and/or creating Cells. - */ - transient volatile int busy; - - /** - * Package-private default constructor - */ - Striped64() { - } - - /** - * CASes the base field. - */ - final boolean casBase(long cmp, long val) { - return UNSAFE.compareAndSwapLong(this, baseOffset, cmp, val); - } - - /** - * CASes the base field. - */ - final long getAndSetBase(long val) { - long v; - do { - v = UNSAFE.getLongVolatile(this, baseOffset); - } while (!UNSAFE.compareAndSwapLong(this, baseOffset, v, val)); - return v; - } - - /** - * CASes the busy field from 0 to 1 to acquire lock. - */ - final boolean casBusy() { - return UNSAFE.compareAndSwapInt(this, busyOffset, 0, 1); - } - - /** - * Computes the function of current and new value. Subclasses - * should open-code this update function for most uses, but the - * virtualized form is needed within retryUpdate. - * - * @param currentValue the current value (of either base or a cell) - * @param newValue the argument from a user update call - * @return result of the update function - */ - abstract long fn(long currentValue, long newValue); - - /** - * Handles cases of updates involving initialization, resizing, - * creating new Cells, and/or contention. See above for - * explanation. This method suffers the usual non-modularity - * problems of optimistic retry code, relying on rechecked sets of - * reads. - * - * @param x the value - * @param hc the hash code holder - * @param wasUncontended false if CAS failed before call - */ - final void retryUpdate(long x, HashCode hc, boolean wasUncontended) { - int h = hc.code; - boolean collide = false; // True if last slot nonempty - for (;;) { - Cell[] as; Cell a; int n; long v; - if ((as = cells) != null && (n = as.length) > 0) { - if ((a = as[(n - 1) & h]) == null) { - if (busy == 0) { // Try to attach new Cell - Cell r = new Cell(x); // Optimistically create - if (busy == 0 && casBusy()) { - boolean created = false; - try { // Recheck under lock - Cell[] rs; int m, j; - if ((rs = cells) != null && - (m = rs.length) > 0 && - rs[j = (m - 1) & h] == null) { - rs[j] = r; - created = true; - } - } finally { - busy = 0; - } - if (created) - break; - continue; // Slot is now non-empty - } - } - collide = false; - } - else if (!wasUncontended) // CAS already known to fail - wasUncontended = true; // Continue after rehash - else if (a.cas(v = a.value, fn(v, x))) - break; - else if (n >= NCPU || cells != as) - collide = false; // At max size or stale - else if (!collide) - collide = true; - else if (busy == 0 && casBusy()) { - try { - if (cells == as) { // Expand table unless stale - Cell[] rs = new Cell[n << 1]; - for (int i = 0; i < n; ++i) - rs[i] = as[i]; - cells = rs; - } - } finally { - busy = 0; - } - collide = false; - continue; // Retry with expanded table - } - h ^= h << 13; // Rehash - h ^= h >>> 17; - h ^= h << 5; - } - else if (busy == 0 && cells == as && casBusy()) { - boolean init = false; - try { // Initialize table - if (cells == as) { - Cell[] rs = new Cell[2]; - rs[h & 1] = new Cell(x); - cells = rs; - init = true; - } - } finally { - busy = 0; - } - if (init) - break; - } - else if (casBase(v = base, fn(v, x))) - break; // Fall back on using base - } - hc.code = h; // Record index for next time - } - - - /** - * Sets base and all cells to the given value. - */ - final void internalReset(long initialValue) { - Cell[] as = cells; - base = initialValue; - if (as != null) { - int n = as.length; - for (int i = 0; i < n; ++i) { - Cell a = as[i]; - if (a != null) - a.value = initialValue; - } - } - } - - // Unsafe mechanics - private static final sun.misc.Unsafe UNSAFE; - private static final long baseOffset; - private static final long busyOffset; - static { - try { - UNSAFE = getUnsafe(); - Class<?> sk = Striped64.class; - baseOffset = UNSAFE.objectFieldOffset - (sk.getDeclaredField("base")); - busyOffset = UNSAFE.objectFieldOffset - (sk.getDeclaredField("busy")); - } catch (Exception e) { - throw new Error(e); - } - } - - /** - * Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. - * Replace with a simple call to Unsafe.getUnsafe when integrating - * into a jdk. - * - * @return a sun.misc.Unsafe - */ - private static sun.misc.Unsafe getUnsafe() { - try { - return sun.misc.Unsafe.getUnsafe(); - } catch (SecurityException tryReflectionInstead) {} - try { - return java.security.AccessController.doPrivileged - (new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { - public sun.misc.Unsafe run() throws Exception { - Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; - for (java.lang.reflect.Field f : k.getDeclaredFields()) { - f.setAccessible(true); - Object x = f.get(null); - if (k.isInstance(x)) - return k.cast(x); - } - throw new NoSuchFieldError("the Unsafe"); - }}); - } catch (java.security.PrivilegedActionException e) { - throw new RuntimeException("Could not initialize intrinsics", - e.getCause()); - } - } -} diff --git a/kamon-core/src/main/java/kamon/util/GlobPathFilter.java b/kamon-core/src/main/java/kamon/util/GlobPathFilter.java deleted file mode 100644 index ac5d08a6..00000000 --- a/kamon-core/src/main/java/kamon/util/GlobPathFilter.java +++ /dev/null @@ -1,110 +0,0 @@ -/* - * ========================================================================================= - * Copyright 2013-2014 the kamon project <http://kamon.io/> - * - * 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 kamon.util; - -import java.util.regex.Matcher; -import java.util.regex.Pattern; - -/** - * Default implementation of PathFilter. Uses glob based includes and excludes to determine whether to export. - * - * @author John E. Bailey - * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a> - */ -public final class GlobPathFilter implements PathFilter { - private static final Pattern GLOB_PATTERN = Pattern.compile("(\\*\\*?)|(\\?)|(\\\\.)|(/+)|([^*?]+)"); - - private final String glob; - private final Pattern pattern; - - /** - * Construct a new instance. - * - * @param glob the path glob to match - */ - public GlobPathFilter(final String glob) { - pattern = getGlobPattern(glob); - this.glob = glob; - } - - /** - * Determine whether a path should be accepted. - * - * @param path the path to check - * @return true if the path should be accepted, false if not - */ - public boolean accept(final String path) { - return pattern.matcher(path).matches(); - } - - /** - * Get a regular expression pattern which accept any path names which match the given glob. The glob patterns - * function similarly to {@code ant} file patterns. Valid metacharacters in the glob pattern include: - * <ul> - * <li><code>"\"</code> - escape the next character (treat it literally, even if it is itself a recognized metacharacter)</li> - * <li><code>"?"</code> - match any non-slash character</li> - * <li><code>"*"</code> - match zero or more non-slash characters</li> - * <li><code>"**"</code> - match zero or more characters, including slashes</li> - * <li><code>"/"</code> - match one or more slash characters. Consecutive {@code /} characters are collapsed down into one.</li> - * </ul> - * In addition, any glob pattern matches all subdirectories thereof. A glob pattern ending in {@code /} is equivalent - * to a glob pattern ending in <code>/**</code> in that the named directory is not itself included in the glob. - * <p/> - * <b>See also:</b> <a href="http://ant.apache.org/manual/dirtasks.html#patterns">"Patterns" in the Ant Manual</a> - * - * @param glob the glob to match - * - * @return the pattern - */ - private static Pattern getGlobPattern(final String glob) { - StringBuilder patternBuilder = new StringBuilder(); - final Matcher m = GLOB_PATTERN.matcher(glob); - boolean lastWasSlash = false; - while (m.find()) { - lastWasSlash = false; - String grp; - if ((grp = m.group(1)) != null) { - // match a * or ** - if (grp.length() == 2) { - // it's a *workers are able to process multiple metrics* - patternBuilder.append(".*"); - } else { - // it's a * - patternBuilder.append("[^/]*"); - } - } else if ((grp = m.group(2)) != null) { - // match a '?' glob pattern; any non-slash character - patternBuilder.append("[^/]"); - } else if ((grp = m.group(3)) != null) { - // backslash-escaped value - patternBuilder.append(Pattern.quote(m.group().substring(1))); - } else if ((grp = m.group(4)) != null) { - // match any number of / chars - patternBuilder.append("/+"); - lastWasSlash = true; - } else { - // some other string - patternBuilder.append(Pattern.quote(m.group())); - } - } - if (lastWasSlash) { - // ends in /, append ** - patternBuilder.append(".*"); - } - return Pattern.compile(patternBuilder.toString()); - } -} |