create web application

pdb-utils/.gitignore

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+/bin/
+/build/
+/.settings/
+/.classpath
+/.project

pdb-utils/build.gradle

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+
+dependencies {
+	
+}

pdb-utils/src/main/java/org/lucares/pdb/api/Entry.java

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+package org.lucares.pdb.api;
+
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
+
+public class Entry {
+
+	/**
+	 * A special {@link Entry} that can be used as poison object for
+	 * {@link BlockingQueueIterator}.
+	 */
+	public static final Entry POISON = new Entry(0, -1);
+
+	public static final long MAX_VALUE = 0xFF_FF_FF_FFL;
+
+	private final long epochMilli;
+
+	private final long value;
+
+	private final Tags tags;
+
+	public Entry(final OffsetDateTime date, final long value, final Tags tags) {
+		this.tags = tags;
+		this.epochMilli = date.toInstant().toEpochMilli();
+		this.value = value;
+	}
+
+	public Entry(final long epochMilli, final long value, final Tags tags) {
+		if (value < 0 || value > MAX_VALUE) {
+			throw new IllegalArgumentException("value must be between 0 and " + MAX_VALUE + ", but was " + value);
+		}
+
+		this.epochMilli = epochMilli;
+		this.value = value;
+		this.tags = tags;
+	}
+
+	private Entry(final long epochMilli, final long value) {
+		this.epochMilli = epochMilli;
+		this.value = value;
+		this.tags = null;
+	}
+
+	public OffsetDateTime getDate() {
+		final Instant instant = Instant.ofEpochMilli(epochMilli);
+		return OffsetDateTime.ofInstant(instant, ZoneOffset.UTC);
+	}
+
+	public long getValue() {
+		return value;
+	}
+
+	public long getEpochMilli() {
+		return epochMilli;
+	}
+
+	public Tags getTags() {
+		return tags;
+	}
+
+	@Override
+	public String toString() {
+		final OffsetDateTime date = getDate();
+		return date.format(DateTimeFormatter.ISO_ZONED_DATE_TIME) + " = " + value + " (" + tags + ")";
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + (int) (epochMilli ^ (epochMilli >>> 32));
+		result = prime * result + ((tags == null) ? 0 : tags.hashCode());
+		result = prime * result + (int) (value ^ (value >>> 32));
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		final Entry other = (Entry) obj;
+		if (epochMilli != other.epochMilli)
+			return false;
+		if (tags == null) {
+			if (other.tags != null)
+				return false;
+		} else if (!tags.equals(other.tags))
+			return false;
+		if (value != other.value)
+			return false;
+		return true;
+	}
+}

pdb-utils/src/main/java/org/lucares/pdb/api/GroupResult.java

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+package org.lucares.pdb.api;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class GroupResult {
+
+	private final Tags groupedBy;
+
+	private final Stream<Entry> entries;
+
+	public GroupResult(final Stream<Entry> entries, final Tags groupedBy) {
+		this.entries = entries;
+		this.groupedBy = groupedBy;
+	}
+
+	/**
+	 * @return {@link Stream} unbound, unordered and non-parallel
+	 */
+	public Stream<Entry> asStream() {
+		return entries;
+	}
+
+	public List<Entry> asList() {
+		return entries.collect(Collectors.toList());
+	}
+
+	public Tags getGroupedBy() {
+		return groupedBy;
+	}
+}

pdb-utils/src/main/java/org/lucares/pdb/api/Result.java

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+package org.lucares.pdb.api;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+
+public class Result {
+
+	private final List<GroupResult> groupResults;
+
+	public Result(final GroupResult... groupResults) {
+		this(Arrays.asList(groupResults));
+	}
+
+	public Result(final Collection<GroupResult> groupResults) {
+		this.groupResults = new ArrayList<>(groupResults);
+	}
+
+	public GroupResult singleGroup() {
+		if (groupResults.size() != 1) {
+			throw new IllegalStateException("the result does not contain exactly one group");
+		}
+		return groupResults.get(0);
+	}
+
+	public List<GroupResult> getGroups() {
+		return new ArrayList<>(groupResults);
+	}
+}

pdb-utils/src/main/java/org/lucares/pdb/api/Tag.java

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+package org.lucares.pdb.api;
+
+public class Tag {
+	private final String key;
+
+	private final String value;
+
+	public Tag(final String key, final String value) {
+		this.key = key;
+		this.value = value;
+	}
+
+	public String getKey() {
+		return key;
+	}
+
+	public String getValue() {
+		return value;
+	}
+
+	@Override
+	public String toString() {
+		return key + "=" + value;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((key == null) ? 0 : key.hashCode());
+		result = prime * result + ((value == null) ? 0 : value.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		final Tag other = (Tag) obj;
+		if (key == null) {
+			if (other.key != null)
+				return false;
+		} else if (!key.equals(other.key))
+			return false;
+		if (value == null) {
+			if (other.value != null)
+				return false;
+		} else if (!value.equals(other.value))
+			return false;
+		return true;
+	}
+
+}

pdb-utils/src/main/java/org/lucares/pdb/api/Tags.java

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+package org.lucares.pdb.api;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
+import java.util.function.BiConsumer;
+
+public class Tags {
+	static final Tags EMPTY = new Tags();
+
+	private final Map<String, Tag> tags;
+
+	private Tags() {
+		super();
+		tags = Collections.emptyMap();
+	}
+
+	private Tags(final Map<String, Tag> tags) {
+		this.tags = tags;
+	}
+
+	public static Tags create() {
+		return EMPTY;
+	}
+
+	public static Tags create(final String key1, final String value1, final String key2, final String value2) {
+		final Map<String, Tag> tags = new HashMap<>(2);
+		tags.put(key1, new Tag(key1, value1));
+		tags.put(key2, new Tag(key2, value2));
+		return new Tags(tags);
+	}
+
+	public static Tags create(final String key, final String value) {
+		final Map<String, Tag> tags = new HashMap<>(1);
+		tags.put(key, new Tag(key, value));
+		return new Tags(tags);
+	}
+
+	public Tags copyAdd(final String key, final String value) {
+		Objects.requireNonNull(key, "key must not be null");
+		Objects.requireNonNull(value, "value must not be null");
+
+		final Map<String, Tag> newTags = new HashMap<>(tags);
+
+		newTags.put(key, new Tag(key, value));
+
+		return new Tags(newTags);
+	}
+
+	public Tags copyAddIfNotNull(final String key, final String value) {
+
+		final Tags result;
+		if (value != null) {
+			result = copyAdd(key, value);
+		} else {
+			result = this;
+		}
+		return result;
+	}
+
+	public String getValue(final String key) {
+		final Tag tag = tags.get(key);
+		final String value = tag != null ? tag.getValue() : null;
+		return value;
+	}
+
+	public Set<String> getKeys() {
+		return new TreeSet<>(tags.keySet());
+	}
+
+	public void forEach(final BiConsumer<String, String> keyValueConsumer) {
+		for (final Map.Entry<String, Tag> e : tags.entrySet()) {
+			keyValueConsumer.accept(e.getKey(), e.getValue().getValue());
+		}
+	}
+
+	@Override
+	public String toString() {
+		return String.valueOf(tags);
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((tags == null) ? 0 : tags.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		final Tags other = (Tags) obj;
+		if (tags == null) {
+			if (other.tags != null)
+				return false;
+		} else if (!tags.equals(other.tags))
+			return false;
+		return true;
+	}
+
+	public String abbreviatedRepresentation() {
+		final StringBuilder result = new StringBuilder();
+		final int maxLength = 200;
+
+		final SortedSet<String> keys = new TreeSet<>(tags.keySet());
+
+		final int cutAt = maxLength / (keys.size() * 2 + 2);
+
+		for (final String key : keys) {
+
+			final String value = tags.get(key).getValue();
+
+			result.append(substr(key, cutAt));
+			result.append("-");
+			result.append(substr(value, cutAt));
+			result.append("_");
+		}
+
+		return substr(result.toString(), maxLength);
+	}
+
+	private static String substr(final String s, final int maxLength) {
+		return s.substring(0, Math.min(maxLength, s.length()));
+	}
+
+}