Http2Settings Class — netty Architecture

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2Settings.java lines 49–308

public final class Http2Settings extends CharObjectHashMap<Long> {
    /**
     * Default capacity based on the number of standard settings from the HTTP/2 spec, adjusted so that adding all of
     * the standard settings will not cause the map capacity to change.
     */
    private static final int DEFAULT_CAPACITY = (int) (NUM_STANDARD_SETTINGS / DEFAULT_LOAD_FACTOR) + 1;
    private static final Long FALSE = 0L;
    private static final Long TRUE = 1L;

    public Http2Settings() {
        this(DEFAULT_CAPACITY);
    }

    public Http2Settings(int initialCapacity, float loadFactor) {
        super(initialCapacity, loadFactor);
    }

    public Http2Settings(int initialCapacity) {
        super(initialCapacity);
    }

    /**
     * Adds the given setting key/value pair. For standard settings defined by the HTTP/2 spec, performs
     * validation on the values.
     *
     * @throws IllegalArgumentException if verification for a standard HTTP/2 setting fails.
     */
    @Override
    public Long put(char key, Long value) {
        verifyStandardSetting(key, value);
        return super.put(key, value);
    }

    /**
     * Gets the {@code SETTINGS_HEADER_TABLE_SIZE} value. If unavailable, returns {@code null}.
     */
    public Long headerTableSize() {
        return get(SETTINGS_HEADER_TABLE_SIZE);
    }

    /**
     * Sets the {@code SETTINGS_HEADER_TABLE_SIZE} value.
     *
     * @throws IllegalArgumentException if verification of the setting fails.
     */
    public Http2Settings headerTableSize(long value) {
        put(SETTINGS_HEADER_TABLE_SIZE, Long.valueOf(value));
        return this;
    }

    /**
     * Gets the {@code SETTINGS_ENABLE_PUSH} value. If unavailable, returns {@code null}.
     */
    public Boolean pushEnabled() {
        Long value = get(SETTINGS_ENABLE_PUSH);
        if (value == null) {
            return null;
        }
        return TRUE.equals(value);
    }

    /**
     * Sets the {@code SETTINGS_ENABLE_PUSH} value.
     */
    public Http2Settings pushEnabled(boolean enabled) {
        put(SETTINGS_ENABLE_PUSH, enabled ? TRUE : FALSE);
        return this;
    }

    /**
     * Gets the {@code SETTINGS_MAX_CONCURRENT_STREAMS} value. If unavailable, returns {@code null}.
     */
    public Long maxConcurrentStreams() {
        return get(SETTINGS_MAX_CONCURRENT_STREAMS);
    }

    /**
     * Sets the {@code SETTINGS_MAX_CONCURRENT_STREAMS} value.
     *
     * @throws IllegalArgumentException if verification of the setting fails.
     */