Examples with ResponseNodeAndPrevnodeTTL com.chinaunicom.etcd.v2.model.ResponseNodeAndPrevnodeTTL used on opensource projects

Example 1 with ResponseNodeAndPrevnodeTTL

use of com.chinaunicom.etcd.v2.model.ResponseNodeAndPrevnodeTTL in project mesosFramework by zhizuqiu.

the class LeaderSelect method mainTest.

@Test
public void mainTest() {
    String leaderId = UUID.randomUUID().toString();
    while (true) {
        // 判断是否有leader节点
        boolean hasLeaderNode = false;
        try {
            etcd.getKey(leaderDir);
            logger.info("leader node exists");
            hasLeaderNode = true;
        } catch (ClientException e) {
            System.out.println("getKey ClientException:" + e.getDetail().getMessage());
        } catch (ServerException e) {
            System.out.println("getKey ServerException:" + e.getMessage());
            continue;
        } catch (Exception e) {
            System.out.println("getKey Exception:" + e.getMessage());
            continue;
        }
        // 如果有，watch leader节点
        if (hasLeaderNode) {
            boolean hasDelete = false;
            try {
                // 这里会阻塞，直到有节点更改
                ResponseNodeAndPrevnodeTTL responseNodeAndPrevnodeTTL = etcd.waitForChange(leaderDir);
                if (EtcdAction.DELETE.equals(responseNodeAndPrevnodeTTL.getAction())) {
                    hasDelete = true;
                }
            } catch (ClientException e) {
                System.out.println("waitForChange ClientException:" + e.getDetail().getMessage());
            } catch (ServerException e) {
                System.out.println("waitForChange ServerException:" + e.getMessage());
                continue;
            } catch (Exception e) {
                System.out.println("waitForChange Exception:" + e.getMessage());
                continue;
            }
            // 如果没有被删除（是其他改变）,重新流程
            if (!hasDelete) {
                continue;
            }
        }
        // 如果没有，创建一个
        boolean getLeader = false;
        try {
            etcd.setKeyTTLWhenNotExists(leaderDir, leaderId, ttl);
            getLeader = true;
        } catch (ClientException e) {
            System.out.println("setKeyTTL ClientException:" + e.getDetail().getMessage());
        } catch (ServerException e) {
            System.out.println("setKeyTTL ServerException:" + e.getMessage());
            continue;
        } catch (Exception e) {
            System.out.println("setKeyTTL Exception:" + e.getMessage());
            continue;
        }
        // 如果创建成功，说明获得leader
        if (getLeader) {
            // 以下为获得leader后的操作
            while (true) {
                try {
                    Thread.sleep(updateTtlInterval);
                } catch (InterruptedException e) {
                    logger.error("sleep InterruptedException");
                }
                try {
                    etcd.refreshKeyTTLByPre(leaderDir, ttl, leaderId);
                    logger.info("refreshKeyTTLByPre success");
                } catch (ClientException e) {
                    System.out.println("refreshKeyTTLByPre ClientException:" + e.getDetail().getMessage());
                    System.out.println("lost leader");
                    break;
                } catch (ServerException e) {
                    System.out.println("refreshKeyTTLByPre ServerException:" + e.getMessage());
                } catch (Exception e) {
                    System.out.println("refreshKeyTTLByPre Exception:" + e.getMessage());
                }
            }
        }
    }
}

Example 2 with ResponseNodeAndPrevnodeTTL

use of com.chinaunicom.etcd.v2.model.ResponseNodeAndPrevnodeTTL in project mesosFramework by zhizuqiu.

the class WatchClientImpl method selectLeader.

@Override
public String selectLeader() {
    while (!closeState.get()) {
        try {
            Thread.sleep(tryInterval);
        } catch (InterruptedException e) {
            logger.error("sleep InterruptedException:" + e.getMessage());
        }
        // 判断是否有leader节点
        boolean hasLeaderNode = false;
        try {
            etcd.getKey(this.leaderPath);
            logger.debug("leader node exists");
            hasLeaderNode = true;
        } catch (ClientException e) {
            logger.error("getDir ClientException:" + e.getDetail().getMessage());
        } catch (ServerException e) {
            logger.error("getDir ServerException:" + e.getMessage());
            continue;
        } catch (Exception e) {
            logger.error("getDir Exception:" + e.getMessage());
            continue;
        }
        // 如果有，watch leader节点
        if (hasLeaderNode) {
            boolean hasDelete = false;
            try {
                // 这里会阻塞，直到有节点更改
                logger.debug("start waitForChange...");
                ResponseNodeAndPrevnodeTTL responseNodeAndPrevnodeTTL = etcd.waitForChange(this.leaderPath);
                if (EtcdAction.EXPIRE.equals(responseNodeAndPrevnodeTTL.getAction())) {
                    logger.debug("node has changed");
                    hasDelete = true;
                } else {
                    logger.debug("waitForChange: " + responseNodeAndPrevnodeTTL.getAction());
                }
            } catch (ClientException e) {
                logger.error("waitForChange ClientException:" + e.getDetail().getMessage());
            } catch (ServerException e) {
                logger.error("waitForChange ServerException:" + e.getMessage());
                continue;
            } catch (Exception e) {
                logger.error("waitForChange Exception:" + e.getMessage());
                continue;
            }
            // 如果没有被删除（是其他改变）,重新流程
            if (!hasDelete) {
                continue;
            }
        }
        // 如果没有，创建一个
        boolean getLeader = false;
        try {
            etcd.setKeyTTLWhenNotExists(this.leaderPath, leaderId, ttl);
            getLeader = true;
            logger.debug("setKeyTTLWhenNotExists success");
        } catch (ClientException e) {
            logger.debug("setKeyTTLWhenNotExists ClientException:" + e.getDetail().getMessage());
        } catch (ServerException e) {
            logger.error("setKeyTTLWhenNotExists ServerException:" + e.getMessage());
            continue;
        } catch (Exception e) {
            logger.error("setKeyTTLWhenNotExists Exception:" + e.getMessage());
            continue;
        }
        // 如果创建成功，说明获得leader
        if (getLeader) {
            return leaderId;
        }
    }
    return null;
}