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8db0403138
Instead of allocating one big continuous memory block before "writing" the XMPP stream element to the socket, write the single CharSequences of LazyStringBuilder/XmlStringBuilder. Also change Obserable writer to only notify the listeners after a flush *or* if a certain limit has been reached since the last notification. Otherwise the debugger would "print" every single XML part as result of this change.
123 lines
3.2 KiB
Java
123 lines
3.2 KiB
Java
/**
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*
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* Copyright 2014 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class LazyStringBuilder implements Appendable, CharSequence {
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private final List<CharSequence> list;
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private String cache;
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private void invalidateCache() {
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cache = null;
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}
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public LazyStringBuilder() {
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list = new ArrayList<CharSequence>(20);
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}
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public LazyStringBuilder append(LazyStringBuilder lsb) {
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list.addAll(lsb.list);
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invalidateCache();
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return this;
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}
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@Override
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public LazyStringBuilder append(CharSequence csq) {
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assert csq != null;
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list.add(csq);
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invalidateCache();
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return this;
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}
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@Override
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public LazyStringBuilder append(CharSequence csq, int start, int end) {
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CharSequence subsequence = csq.subSequence(start, end);
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list.add(subsequence);
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invalidateCache();
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return this;
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}
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@Override
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public LazyStringBuilder append(char c) {
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list.add(Character.toString(c));
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invalidateCache();
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return this;
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}
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@Override
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public int length() {
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if (cache != null) {
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return cache.length();
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}
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int length = 0;
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for (CharSequence csq : list) {
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length += csq.length();
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}
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return length;
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}
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@Override
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public char charAt(int index) {
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if (cache != null) {
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return cache.charAt(index);
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}
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for (CharSequence csq : list) {
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if (index < csq.length()) {
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return csq.charAt(index);
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} else {
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index -= csq.length();
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}
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}
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throw new IndexOutOfBoundsException();
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}
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@Override
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public CharSequence subSequence(int start, int end) {
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return toString().subSequence(start, end);
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}
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@Override
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public String toString() {
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if (cache == null) {
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StringBuilder sb = new StringBuilder(length());
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for (CharSequence csq : list) {
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sb.append(csq);
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}
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cache = sb.toString();
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}
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return cache;
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}
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/**
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* Get the List of CharSequences representation of this instance. The list is unmodifiable. If
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* the resulting String was already cached, a list with a single String entry will be returned.
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*
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* @return a List of CharSequences representing this instance.
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*/
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public List<CharSequence> getAsList() {
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if (cache != null) {
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return Collections.singletonList((CharSequence) cache);
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}
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return Collections.unmodifiableList(list);
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}
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}
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