sshd-core/src/main/java/org/apache/sshd/common/channel/AbstractChannel.java [1044:1075]:
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    @Override
    public Map<String, Object> getProperties() {
        return properties;
    }

    @Override
    public int getAttributesCount() {
        return attributes.size();
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T> T getAttribute(AttributeRepository.AttributeKey<T> key) {
        return (T) attributes.get(Objects.requireNonNull(key, "No key"));
    }

    @Override
    public Collection<AttributeKey<?>> attributeKeys() {
        return attributes.isEmpty() ? Collections.emptySet() : new HashSet<>(attributes.keySet());
    }

    @Override
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public <T> T computeAttributeIfAbsent(
            AttributeRepository.AttributeKey<T> key,
            Function<? super AttributeRepository.AttributeKey<T>, ? extends T> resolver) {
        return (T) attributes.computeIfAbsent(Objects.requireNonNull(key, "No key"), (Function) resolver);
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T> T setAttribute(AttributeRepository.AttributeKey<T> key, T value) {
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sshd-core/src/main/java/org/apache/sshd/common/helpers/AbstractFactoryManager.java [146:177]:
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    @Override
    public Map<String, Object> getProperties() {
        return properties;
    }

    @Override
    public int getAttributesCount() {
        return attributes.size();
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T> T getAttribute(AttributeRepository.AttributeKey<T> key) {
        return (T) attributes.get(Objects.requireNonNull(key, "No key"));
    }

    @Override
    public Collection<AttributeKey<?>> attributeKeys() {
        return attributes.isEmpty() ? Collections.emptySet() : new HashSet<>(attributes.keySet());
    }

    @Override
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public <T> T computeAttributeIfAbsent(
            AttributeRepository.AttributeKey<T> key,
            Function<? super AttributeRepository.AttributeKey<T>, ? extends T> resolver) {
        return (T) attributes.computeIfAbsent(Objects.requireNonNull(key, "No key"), (Function) resolver);
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T> T setAttribute(AttributeRepository.AttributeKey<T> key, T value) {
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