Java tutorial
/** * Copyright 2014-2017 yangming.liu<bytefox@126.com>. * * This copyrighted material is made available to anyone wishing to use, modify, * copy, or redistribute it subject to the terms and conditions of the GNU * Lesser General Public License, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License * for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution; if not, see <http://www.gnu.org/licenses/>. */ package org.bytesoft.bytetcc.supports.springcloud; import java.io.IOException; import java.io.Serializable; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import javax.transaction.xa.XAException; import javax.transaction.xa.XAResource; import javax.transaction.xa.Xid; import org.apache.commons.lang3.StringUtils; import org.bytesoft.bytejta.supports.wire.RemoteCoordinator; import org.bytesoft.common.utils.ByteUtils; import org.bytesoft.common.utils.CommonUtils; import org.springframework.http.HttpHeaders; import org.springframework.http.ResponseEntity; import org.springframework.web.client.HttpClientErrorException; import org.springframework.web.client.HttpServerErrorException; import org.springframework.web.client.RestTemplate; public class SpringCloudCoordinator implements InvocationHandler { private String identifier; public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { Class<?> clazz = method.getDeclaringClass(); String methodName = method.getName(); if (Object.class.equals(clazz)) { return method.invoke(this, args); } else if (RemoteCoordinator.class.equals(clazz)) { if ("getIdentifier".equals(methodName)) { return this.identifier; } else if ("recoveryCommit".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else if ("recoveryRollback".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else if ("recoveryForget".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else { throw new XAException(XAException.XAER_RMFAIL); } } else if (XAResource.class.equals(clazz)) { if ("prepare".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else if ("commit".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else if ("rollback".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else if ("recover".equals(methodName)) { return this.invokeGetCoordinator(proxy, method, args); } else if ("forget".equals(methodName)) { return this.invokePostCoordinator(proxy, method, args); } else { throw new XAException(XAException.XAER_RMFAIL); } } else { throw new IllegalAccessException(); } } public Object invokePostCoordinator(Object proxy, Method method, Object[] args) throws Throwable { Class<?> returnType = method.getReturnType(); try { int firstIndex = this.identifier.indexOf(":"); int lastIndex = this.identifier.lastIndexOf(":"); String prefix = firstIndex <= 0 ? null : this.identifier.substring(0, firstIndex); String suffix = lastIndex <= 0 ? null : this.identifier.substring(lastIndex + 1); String instanceId = prefix == null || suffix == null ? null : prefix + ":" + suffix; StringBuilder ber = new StringBuilder(); ber.append("http://"); ber.append(instanceId); ber.append("/org/bytesoft/bytetcc/"); ber.append(method.getName()); for (int i = 0; i < args.length; i++) { Serializable arg = (Serializable) args[i]; ber.append("/").append(this.serialize(arg)); } ResponseEntity<?> response = new RestTemplate().postForEntity(ber.toString(), null, returnType, new Object[0]); return response.getBody(); } catch (HttpClientErrorException ex) { throw new XAException(XAException.XAER_RMFAIL); } catch (HttpServerErrorException ex) { // int statusCode = ex.getRawStatusCode(); HttpHeaders headers = ex.getResponseHeaders(); String failureText = StringUtils.trimToNull(headers.getFirst("failure")); String errorText = StringUtils.trimToNull(headers.getFirst("XA_XAER")); Boolean failure = failureText == null ? null : Boolean.parseBoolean(failureText); Integer errorCode = errorText == null || errorText.matches("\\d+") == false ? null : Integer.parseInt(errorText); if (failure != null && errorCode != null) { throw new XAException(errorCode); } else { throw new XAException(XAException.XAER_RMERR); } } catch (Exception ex) { throw new XAException(XAException.XAER_RMERR); } } public Object invokeGetCoordinator(Object proxy, Method method, Object[] args) throws Throwable { Class<?> returnType = method.getReturnType(); try { StringBuilder ber = new StringBuilder(); ber.append("http://"); ber.append(this.identifier); ber.append("/org/bytesoft/bytetcc/"); ber.append(method.getName()); for (int i = 0; i < args.length; i++) { Serializable arg = (Serializable) args[i]; ber.append("/").append(this.serialize(arg)); } ResponseEntity<?> response = new RestTemplate().getForEntity(ber.toString(), returnType, new Object[0]); return response.getBody(); } catch (HttpClientErrorException ex) { throw new XAException(XAException.XAER_RMFAIL); } catch (HttpServerErrorException ex) { HttpHeaders headers = ex.getResponseHeaders(); String failureText = StringUtils.trimToNull(headers.getFirst("failure")); String errorText = StringUtils.trimToNull(headers.getFirst("XA_XAER")); Boolean failure = failureText == null ? null : Boolean.parseBoolean(failureText); Integer errorCode = errorText == null || errorText.matches("\\d+") == false ? null : Integer.parseInt(errorText); if (failure != null && errorCode != null) { throw new XAException(errorCode); } else { throw new XAException(XAException.XAER_RMERR); } } catch (Exception ex) { throw new XAException(XAException.XAER_RMERR); } } private String serialize(Serializable arg) throws IOException { if (Xid.class.isInstance(arg)) { Xid xid = (Xid) arg; byte[] globalTransactionId = xid.getGlobalTransactionId(); return ByteUtils.byteArrayToString(globalTransactionId); } else if (Integer.class.isInstance(arg) || Integer.TYPE.isInstance(arg)) { return String.valueOf(arg); } else if (Boolean.class.isInstance(arg) || Boolean.TYPE.isInstance(arg)) { return String.valueOf(arg); } else { byte[] byteArray = CommonUtils.serializeObject(arg); return ByteUtils.byteArrayToString(byteArray); } } public String getIdentifier() { return identifier; } public void setIdentifier(String identifier) { this.identifier = identifier; } }