Java tutorial
/** * Copyright 2016 Yahoo Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.yahoo.pulsar.utils; import static org.testng.Assert.assertEquals; import static org.testng.Assert.fail; import java.lang.reflect.Method; import java.nio.charset.Charset; import org.testng.annotations.BeforeMethod; import org.testng.annotations.Test; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; public class StatsOutputStreamTest { private ByteBuf buf; private StatsOutputStream stream; @BeforeMethod public void reset() { buf = Unpooled.buffer(4096); stream = new StatsOutputStream(buf); } @Test public void testBooleanFormat() { stream.writeBoolean(false); assertEquals(str(), "false"); stream.writeBoolean(true); assertEquals(str(), "true"); } @Test public void testLongFormat() { stream.writeLong(0); assertEquals(str(), "0"); stream.writeLong(-1); assertEquals(str(), "-1"); stream.writeLong(123456789); assertEquals(str(), "123456789"); stream.writeLong(-123456789); assertEquals(str(), "-123456789"); long i = 2 * (long) Integer.MAX_VALUE; stream.writeLong(i); assertEquals(str(), Long.toString(i)); stream.writeLong(Long.MAX_VALUE); assertEquals(str(), Long.toString(Long.MAX_VALUE)); stream.writeLong(Long.MIN_VALUE); assertEquals(str(), Long.toString(Long.MIN_VALUE)); // Testing trailing 0s stream.writeLong(100); assertEquals(str(), "100"); stream.writeLong(-1000); assertEquals(str(), "-1000"); } @Test public void testDoubleFormat() { stream.writeDouble(0.0); assertEquals(str(), "0.0"); stream.writeDouble(1.0); assertEquals(str(), "1.0"); stream.writeDouble(1.123456789); assertEquals(str(), "1.123"); stream.writeDouble(123456.123456789); assertEquals(str(), "123456.123"); stream.writeDouble(-123456.123456789); assertEquals(str(), "-123456.123"); stream.writeDouble(-123456.003456789); assertEquals(str(), "-123456.003"); stream.writeDouble(-123456.100456789); assertEquals(str(), "-123456.100"); } @Test public void testPairs() { stream.writePair("my-count", 1); assertEquals(str(), "\"my-count\":1"); stream.writePair("my-rate", 0.0); assertEquals(str(), "\"my-rate\":0.0"); stream.writePair("my-flag", true); assertEquals(str(), "\"my-flag\":true"); stream.writePair("my-string", "value"); assertEquals(str(), "\"my-string\":\"value\""); } @Test public void testLists() { stream.startList(); stream.endList(); assertEquals(str(), "[]"); stream.startList(); stream.write(1); stream.endList(); assertEquals(str(), "[1]"); stream.startList(); stream.write(1).write(2); stream.endList(); assertEquals(str(), "[1,2]"); stream.startList(); stream.write(1).write(2).write(3); stream.endList(); assertEquals(str(), "[1,2,3]"); stream.startList(); stream.write(1).write(2).write(3).write(false).write(1.0).write("xyz"); stream.endList(); assertEquals(str(), "[1,2,3,false,1.0,\"xyz\"]"); } @Test public void testNamedLists() { stream.startList("abc"); stream.endList(); assertEquals(str(), "\"abc\":[]"); stream.startList("abc"); stream.write(1); stream.endList(); assertEquals(str(), "\"abc\":[1]"); } @Test public void testObjects() { stream.startObject(); stream.endObject(); assertEquals(str(), "{}"); stream.startObject(); stream.writePair("a", 1); stream.endObject(); assertEquals(str(), "{\"a\":1}"); stream.startObject(); stream.writePair("a", 1).writePair("b", 2); stream.endObject(); assertEquals(str(), "{\"a\":1,\"b\":2}"); stream.startObject(); stream.writePair("a", 1).writePair("b", 2).writePair("c", 3); stream.endObject(); assertEquals(str(), "{\"a\":1,\"b\":2,\"c\":3}"); } @Test public void testNamedObjects() { stream.startObject("abc"); stream.endObject(); assertEquals(str(), "\"abc\":{}"); stream.startObject("abc"); stream.writePair("a", 1); stream.endObject(); assertEquals(str(), "\"abc\":{\"a\":1}"); } @Test public void testNestedObjects() { stream.startList(); stream.startObject(); stream.writePair("a", 1); stream.endObject(); stream.startObject(); stream.writePair("b", 2); stream.endObject(); stream.endList(); assertEquals(str(), "[{\"a\":1},{\"b\":2}]"); } @Test public void testString() { stream.writeEncodedString("\b`~8H\\abcd\""); assertEquals(str(), "\\ufffd\\u0008`~\\ufffd\\u00fd\\u00fd8\\u00fdH\\\\abcd\\\""); } @SuppressWarnings("unchecked") @Test public void testCopyOnWriteArrayList() { try { CopyOnWriteArrayList.EMPTY_LIST.add(1); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.set(0, 0); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.add(1, 1); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.remove(1); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.remove("Object"); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.addIfAbsent(1); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.removeAll(CopyOnWriteArrayList.EMPTY_LIST); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.addAllAbsent(CopyOnWriteArrayList.EMPTY_LIST); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.addAll(CopyOnWriteArrayList.EMPTY_LIST); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.removeIf(null); fail(); } catch (UnsupportedOperationException e) { // Ok } try { CopyOnWriteArrayList.EMPTY_LIST.replaceAll(null); fail(); } catch (UnsupportedOperationException e) { // Ok } } public String str() { String s = buf.toString(Charset.forName("utf-8")); reset(); return s; } }