4875a2aad4
Motivation: The `AsciiString#toString` method calculate string value and cache it into field. If an `AsciiString` created from the `String` value, we can avoid rebuilding strings if we cache them immediately when creating `AsciiString`. It would be useful for constants strings, which already stored in the JVMs string table, or in cases where an unavoidable `#toString `method call is assumed. Modifications: - Add new static method `AsciiString#cache(String)` which save string value into cache field. - Apply a "benign" data race in the `#hashCode` and `#toString` methods. Result: Less memory usage in some `AsciiString` use cases.
81 lines
3.5 KiB
Java
81 lines
3.5 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.stomp;
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import io.netty.handler.codec.Headers;
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import io.netty.util.AsciiString;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map.Entry;
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/**
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* The multimap data structure for the STOMP header names and values. It also provides the constants for the standard
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* STOMP header names and values.
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*/
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public interface StompHeaders extends Headers<CharSequence, CharSequence, StompHeaders> {
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AsciiString ACCEPT_VERSION = AsciiString.cached("accept-version");
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AsciiString HOST = AsciiString.cached("host");
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AsciiString LOGIN = AsciiString.cached("login");
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AsciiString PASSCODE = AsciiString.cached("passcode");
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AsciiString HEART_BEAT = AsciiString.cached("heart-beat");
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AsciiString VERSION = AsciiString.cached("version");
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AsciiString SESSION = AsciiString.cached("session");
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AsciiString SERVER = AsciiString.cached("server");
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AsciiString DESTINATION = AsciiString.cached("destination");
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AsciiString ID = AsciiString.cached("id");
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AsciiString ACK = AsciiString.cached("ack");
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AsciiString TRANSACTION = AsciiString.cached("transaction");
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AsciiString RECEIPT = AsciiString.cached("receipt");
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AsciiString MESSAGE_ID = AsciiString.cached("message-id");
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AsciiString SUBSCRIPTION = AsciiString.cached("subscription");
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AsciiString RECEIPT_ID = AsciiString.cached("receipt-id");
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AsciiString MESSAGE = AsciiString.cached("message");
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AsciiString CONTENT_LENGTH = AsciiString.cached("content-length");
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AsciiString CONTENT_TYPE = AsciiString.cached("content-type");
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/**
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* {@link Headers#get(Object)} and convert the result to a {@link String}.
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* @param name the name of the header to retrieve
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* @return the first header value if the header is found. {@code null} if there's no such header.
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*/
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String getAsString(CharSequence name);
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/**
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* {@link Headers#getAll(Object)} and convert each element of {@link List} to a {@link String}.
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* @param name the name of the header to retrieve
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* @return a {@link List} of header values or an empty {@link List} if no values are found.
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*/
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List<String> getAllAsString(CharSequence name);
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/**
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* {@link #iterator()} that converts each {@link Entry}'s key and value to a {@link String}.
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*/
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Iterator<Entry<String, String>> iteratorAsString();
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/**
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* Returns {@code true} if a header with the {@code name} and {@code value} exists, {@code false} otherwise.
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* <p>
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* If {@code ignoreCase} is {@code true} then a case insensitive compare is done on the value.
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* @param name the name of the header to find
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* @param value the value of the header to find
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* @param ignoreCase {@code true} then a case insensitive compare is run to compare values.
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* otherwise a case sensitive compare is run to compare values.
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*/
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boolean contains(CharSequence name, CharSequence value, boolean ignoreCase);
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}
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